ExtensionStructureDefinition_Differential_Element - Definitions - Extensions for Using Data Elements from FHIR DSTU2 in FHIR R5 v0.1.0

Extensions for Using Data Elements from FHIR DSTU2 in FHIR R5 - Downloaded Version null See the Directory of published versions

Extension: ExtensionStructureDefinition_Differential_Element - Detailed Descriptions

Page standards status: Trial-use

Maturity Level: 0

Definitions for the ext-R2-StructureDefinition.dif.element extension.

Key Elements Table
Differential Elements Table
Snapshot Elements Table

Guidance on how to interpret the contents of this table can be foundhere

0. Extension
Definition	DSTU2: `StructureDefinition.differential.element` additional types (ElementDefinition) additional types from child elements (alias, base, max, min, path, binding, description, strength, valueSet[x], code, comments, condition, constraint, human, key, requirements, severity, xpath, defaultValue[x], definition, example[x], fixed[x], isModifier, isSummary, label, mapping, identity, language, map, maxLength, maxValue[x], meaningWhenMissing, minValue[x], mustSupport, name, nameReference, pattern[x], representation, short, slicing, discriminator, ordered, rules, type, aggregation, profile) Optional Extension Element - found in all resources.
Short	DSTU2: element additional typesOptional Extensions Element
Comments	Element `StructureDefinition.differential.element` is mapped to FHIR R5 element `StructureDefinition.differential.element` as `SourceIsBroaderThanTarget`. The mappings for `StructureDefinition.differential.element` do not cover the following types: ElementDefinition. The mappings for `StructureDefinition.differential.element` do not cover the following types based on type expansion: aggregation, alias, base, binding, code, comments, condition, constraint, defaultValue[x], definition, description, discriminator, example[x], fixed[x], human, identity, isModifier, isSummary, key, label, language, map, mapping, max, maxLength, maxValue[x], meaningWhenMissing, min, minValue[x], mustSupport, name, nameReference, ordered, path, pattern[x], profile, representation, requirements, rules, severity, short, slicing, strength, type, valueSet[x], xpath.
Control	10..*
Is Modifier	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
2. Extension.extension
Definition	An Extension May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	ExtensionAdditional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	10..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
Slicing	This element introduces a set of slices on `Extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
4. Extension.extension:_datatype
Slice Name	_datatype
Definition	Slice to indicate the presence of a DSTU2 `ElementDefinition` in FHIR R5
Short	DataType slice for a FHIR DSTU2 `ElementDefinition` valueAdditional content defined by implementations
Control	10..1*
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
6. Extension.extension:_datatype.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`http://hl7.org/fhir/StructureDefinition/_datatype`
8. Extension.extension:_datatype.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Comments	Must be: ElementDefinition
Control	10..1 This element is affected by the following invariants: ext-1
Type	string, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Fixed Value	`ElementDefinition`
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
10. Extension.extension:path
Slice Name	path
Definition	DSTU2: `ElementDefinition.path`
Short	DSTU2: The path of the element (see the Detailed Descriptions)Additional content defined by implementations
Comments	Element `ElementDefinition.path` is mapped to FHIR R5 element `ElementDefinition.path` as `Equivalent`.
Control	10..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.path` is mapped to FHIR R5 element `ElementDefinition.path` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
12. Extension.extension:path.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`path`
14. Extension.extension:path.value[x]
Definition	The path identifies the element and is expressed as a "."-separated list of ancestor elements, beginning with the name of the resource or extension. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	The path of the element (see the Detailed Descriptions)Value of extension
Control	10..1 This element is affected by the following invariants: ext-1
Type	string, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
16. Extension.extension:representation
Slice Name	representation
Definition	DSTU2: `ElementDefinition.representation` additional codes
Short	DSTU2: How this element is represented in instances additional codesAdditional content defined by implementations
Comments	Element `ElementDefinition.representation` is mapped to FHIR R5 element `ElementDefinition.representation` as `SourceIsNarrowerThanTarget`. The mappings for `ElementDefinition.representation` do not allow expression of the necessary codes, per the bindings on the source and target. This is rarely used except for special cases where the representation deviates from the normal, which is done only very reluctantly, and can only be done in the base standard (and profiles must reproduce what the base standard does).
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.representation` is mapped to FHIR R5 element `ElementDefinition.representation` as `SourceIsNarrowerThanTarget`. The mappings for `ElementDefinition.representation` do not allow expression of the necessary codes, per the bindings on the source and target.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
18. Extension.extension:representation.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`representation`
20. Extension.extension:representation.value[x]
Definition	Codes that define how this element is represented in instances, when the deviation varies from the normal case. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	How this element is represented in instancesValue of extension
Comments	This is rarely used except for special cases where the representation deviates from the normal, which is done only very reluctantly, and can only be done in the base standard (and profiles must reproduce what the base standard does).
Control	0..1 This element is affected by the following invariants: ext-1
Binding	The codes SHALL be taken from For codes, see PropertyRepresentation (required to `http://hl7.org/fhir/ValueSet/property-representation\|5.0.0`) How a property is represented on the wire.
Type	code, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
22. Extension.extension:name
Slice Name	name
Definition	DSTU2: `ElementDefinition.name`
Short	DSTU2: Name for this particular element definition (reference target)Additional content defined by implementations
Comments	Element `ElementDefinition.name` is mapped to FHIR R5 element `ElementDefinition.sliceName` as `Equivalent`. The name SHALL be unique within the structure within the context of the constrained resource element. (Though to avoid confusion, uniqueness across all elements is recommended.).
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Allows referencing a defined element. May also be used for code generation purposes. Element `ElementDefinition.name` is mapped to FHIR R5 element `ElementDefinition.sliceName` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
24. Extension.extension:name.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`name`
26. Extension.extension:name.value[x]
Definition	The name of this element definition (to refer to it from other element definitions using ElementDefinition.nameReference). This is a unique name referring to a specific set of constraints applied to this element. One use of this is to provide a name to different slices of the same element. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Name for this particular element definition (reference target)Value of extension
Comments	The name SHALL be unique within the structure within the context of the constrained resource element. (Though to avoid confusion, uniqueness across all elements is recommended.).
Control	0..1 This element is affected by the following invariants: ext-1
Type	string, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
28. Extension.extension:label
Slice Name	label
Definition	DSTU2: `ElementDefinition.label`
Short	DSTU2: labelAdditional content defined by implementations
Comments	Element `ElementDefinition.label` is mapped to FHIR R5 element `ElementDefinition.label` as `Equivalent`. Question and label serve similar purposes in they both can be used to prompt for capturing a data element. Whether the question form or label form should be used will depend on the type of instrument being used to capture the information.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.label` is mapped to FHIR R5 element `ElementDefinition.label` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
30. Extension.extension:label.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`label`
32. Extension.extension:label.value[x]
Definition	The text to display beside the element indicating its meaning or to use to prompt for the element in a user display or form. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Name for element to display with or prompt for elementValue of extension
Comments	Question and label serve similar purposes in they both can be used to prompt for capturing a data element. Whether the question form or label form should be used will depend on the type of instrument being used to capture the information.
Control	0..1 This element is affected by the following invariants: ext-1
Type	string, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
34. Extension.extension:code
Slice Name	code
Definition	DSTU2: `ElementDefinition.code`
Short	DSTU2: Defining codeAdditional content defined by implementations
Comments	Element `ElementDefinition.code` is mapped to FHIR R5 element `ElementDefinition.code` as `Equivalent`. The data element definition and other constraints SHALL be a proper constraint on the meaning (as defined in the code system, including relationships) of any code listed here. Where multiple codes exist in a terminology that could correspond to the data element, the most granular code(s) should be selected, so long as they are not more restrictive than the data element itself.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Links the meaning of an element to an external terminology. Element `ElementDefinition.code` is mapped to FHIR R5 element `ElementDefinition.code` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
36. Extension.extension:code.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`code`
38. Extension.extension:code.value[x]
Definition	A code that provides the meaning for the element according to a particular terminology. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Defining codeValue of extension
Comments	The data element definition and other constraints SHALL be a proper constraint on the meaning (as defined in the code system, including relationships) of any code listed here. Where multiple codes exist in a terminology that could correspond to the data element, the most granular code(s) should be selected, so long as they are not more restrictive than the data element itself.
Control	0..1 This element is affected by the following invariants: ext-1
Type	Coding, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
40. Extension.extension:slicing
Slice Name	slicing
Definition	DSTU2: `ElementDefinition.slicing`
Short	DSTU2: slicingAdditional content defined by implementations
Comments	Element `ElementDefinition.slicing` is mapped to FHIR R5 element `ElementDefinition.slicing` as `Equivalent`. The first element in the sequence, the one that carries the slicing, is the unconstrained element, for reference purposes . This may include the unconstrained children.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.slicing` is mapped to FHIR R5 element `ElementDefinition.slicing` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
42. Extension.extension:slicing.extension
Definition	An Extension May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	ExtensionAdditional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	10..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
44. Extension.extension:slicing.extension:discriminator
Slice Name	discriminator
Definition	DSTU2: `ElementDefinition.slicing.discriminator`
Short	DSTU2: Element values that used to distinguish the slicesAdditional content defined by implementations
Comments	Element `ElementDefinition.slicing.discriminator` is mapped to FHIR R5 element `ElementDefinition.slicing.discriminator` as `Equivalent`. If there is no discriminator, the content is hard to process, so this should be avoided. If the base element has a cardinality of ..1, and there is a choice of types, the discriminator most be "@type".
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.slicing.discriminator` is mapped to FHIR R5 element `ElementDefinition.slicing.discriminator` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
46. Extension.extension:slicing.extension:discriminator.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`discriminator`
48. Extension.extension:slicing.extension:discriminator.value[x]
Definition	Designates which child elements are used to discriminate between the slices when processing an instance. If one or more discriminators are provided, the value of the child elements in the instance data SHALL completely distinguish which slice the element in the resource matches based on the allowed values for those elements in each of the slices. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Element values that used to distinguish the slicesValue of extension
Comments	If there is no discriminator, the content is hard to process, so this should be avoided. If the base element has a cardinality of ..1, and there is a choice of types, the discriminator most be "@type".
Control	0..1 This element is affected by the following invariants: ext-1
Type	string, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
50. Extension.extension:slicing.extension:description
Slice Name	description
Definition	DSTU2: `ElementDefinition.slicing.description`
Short	DSTU2: descriptionAdditional content defined by implementations
Comments	Element `ElementDefinition.slicing.description` is mapped to FHIR R5 element `ElementDefinition.slicing.description` as `Equivalent`. If it's really not possible to differentiate them, the design should be re-evaluated to make the content usable.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.slicing.description` is mapped to FHIR R5 element `ElementDefinition.slicing.description` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
52. Extension.extension:slicing.extension:description.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`description`
54. Extension.extension:slicing.extension:description.value[x]
Definition	A human-readable text description of how the slicing works. If there is no discriminator, this is required to be present to provide whatever information is possible about how the slices can be differentiated. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Text description of how slicing works (or not)Value of extension
Comments	If it's really not possible to differentiate them, the design should be re-evaluated to make the content usable.
Control	0..1 This element is affected by the following invariants: ext-1
Type	string, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
56. Extension.extension:slicing.extension:ordered
Slice Name	ordered
Definition	DSTU2: `ElementDefinition.slicing.ordered`
Short	DSTU2: orderedAdditional content defined by implementations
Comments	Element `ElementDefinition.slicing.ordered` is mapped to FHIR R5 element `ElementDefinition.slicing.ordered` as `Equivalent`. Order should only be required when it is a pressing concern for presentation. Profile authors should consider making the order a feature of the rules about the narrative, not the rules about the data - requiring ordered data makes the profile much less re-usable.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.slicing.ordered` is mapped to FHIR R5 element `ElementDefinition.slicing.ordered` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
58. Extension.extension:slicing.extension:ordered.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`ordered`
60. Extension.extension:slicing.extension:ordered.value[x]
Definition	If the matching elements have to occur in the same order as defined in the profile. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	If elements must be in same order as slicesValue of extension
Comments	Order should only be required when it is a pressing concern for presentation. Profile authors should consider making the order a feature of the rules about the narrative, not the rules about the data - requiring ordered data makes the profile much less re-usable.
Control	0..1 This element is affected by the following invariants: ext-1
Type	boolean, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
62. Extension.extension:slicing.extension:rules
Slice Name	rules
Definition	DSTU2: `ElementDefinition.slicing.rules`
Short	DSTU2: rulesAdditional content defined by implementations
Comments	Element `ElementDefinition.slicing.rules` is mapped to FHIR R5 element `ElementDefinition.slicing.rules` as `Equivalent`. Allowing additional elements makes for a much for flexible template - it's open for use in wider contexts, but also means that the content of the resource is not closed, and applications have to decide how to handle content not described by the profile.
Control	10..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.slicing.rules` is mapped to FHIR R5 element `ElementDefinition.slicing.rules` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
64. Extension.extension:slicing.extension:rules.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`rules`
66. Extension.extension:slicing.extension:rules.value[x]
Definition	Whether additional slices are allowed or not. When the slices are ordered, profile authors can also say that additional slices are only allowed at the end. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	closed \| open \| openAtEndValue of extension
Comments	Allowing additional elements makes for a much for flexible template - it's open for use in wider contexts, but also means that the content of the resource is not closed, and applications have to decide how to handle content not described by the profile.
Control	10..1 This element is affected by the following invariants: ext-1
Binding	The codes SHALL be taken from For codes, see SlicingRules (required to `http://hl7.org/fhir/ValueSet/resource-slicing-rules\|5.0.0`) How slices are interpreted when evaluating an instance.
Type	code, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
68. Extension.extension:slicing.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`slicing`
70. Extension.extension:slicing.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	0..01 This element is affected by the following invariants: ext-1
Type	Choice of: base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, integer64, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, CodeableReference, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, RatioRange, Reference, SampledData, Signature, Timing, ContactDetail, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Availability, ExtendedContactDetail, Dosage, Meta
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
72. Extension.extension:short
Slice Name	short
Definition	DSTU2: `ElementDefinition.short`
Short	DSTU2: Concise definition for xml presentationAdditional content defined by implementations
Comments	Element `ElementDefinition.short` is mapped to FHIR R5 element `ElementDefinition.short` as `Equivalent`. May change the term to provide language more appropriate to the context of the profile or to reflect slicing.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.short` is mapped to FHIR R5 element `ElementDefinition.short` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
74. Extension.extension:short.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`short`
76. Extension.extension:short.value[x]
Definition	A concise description of what this element means (e.g. for use in autogenerated summaries). Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Concise definition for xml presentationValue of extension
Comments	May change the term to provide language more appropriate to the context of the profile or to reflect slicing.
Control	0..1 This element is affected by the following invariants: ext-1
Type	string, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
78. Extension.extension:definition
Slice Name	definition
Definition	DSTU2: `ElementDefinition.definition`
Short	DSTU2: definitionAdditional content defined by implementations
Comments	Element `ElementDefinition.definition` is mapped to FHIR R5 element `ElementDefinition.definition` as `Equivalent`. It is easy for a different definition to change the meaning of an element and this can have nasty downstream consequences. Please be careful when providing definitions.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	To allow a user to state the usage of an element in a particular context. Element `ElementDefinition.definition` is mapped to FHIR R5 element `ElementDefinition.definition` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
80. Extension.extension:definition.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`definition`
82. Extension.extension:definition.value[x]
Definition	Provides a complete explanation of the meaning of the data element for human readability. For the case of elements derived from existing elements (e.g. constraints), the definition SHALL be consistent with the base definition, but convey the meaning of the element in the particular context of use of the resource. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Full formal definition as narrative textValue of extension
Comments	It is easy for a different definition to change the meaning of an element and this can have nasty downstream consequences. Please be careful when providing definitions.
Control	0..1 This element is affected by the following invariants: ext-1
Type	markdown, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, string, oid, instant, ContactPoint, HumanName, Money, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
84. Extension.extension:comments
Slice Name	comments
Definition	DSTU2: `ElementDefinition.comments`
Short	DSTU2: commentsAdditional content defined by implementations
Comments	Element `ElementDefinition.comments` is mapped to FHIR R5 element `ElementDefinition.comment` as `Equivalent`. If it is possible to capture usage rules using constraints, that mechanism should be used in preference to this element.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.comments` is mapped to FHIR R5 element `ElementDefinition.comment` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
86. Extension.extension:comments.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`comments`
88. Extension.extension:comments.value[x]
Definition	Explanatory notes and implementation guidance about the data element, including notes about how to use the data properly, exceptions to proper use, etc. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Comments about the use of this elementValue of extension
Comments	If it is possible to capture usage rules using constraints, that mechanism should be used in preference to this element.
Control	0..1 This element is affected by the following invariants: ext-1
Type	markdown, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, string, oid, instant, ContactPoint, HumanName, Money, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
90. Extension.extension:requirements
Slice Name	requirements
Definition	DSTU2: `ElementDefinition.requirements`
Short	DSTU2: Why is this needed?Additional content defined by implementations
Comments	Element `ElementDefinition.requirements` is mapped to FHIR R5 element `ElementDefinition.requirements` as `Equivalent`. This element does not describe the usage of the element (that's done in comments), rather it's for traceability of why the element is either needed or why the constraints exist as they do. This may be used to point to source materials or specifications that drove the structure of this data element.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.requirements` is mapped to FHIR R5 element `ElementDefinition.requirements` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
92. Extension.extension:requirements.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`requirements`
94. Extension.extension:requirements.value[x]
Definition	This element is for traceability of why the element was created and why the constraints exist as they do. This may be used to point to source materials or specifications that drove the structure of this element. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Why is this needed?Value of extension
Comments	This element does not describe the usage of the element (that's done in comments), rather it's for traceability of why the element is either needed or why the constraints exist as they do. This may be used to point to source materials or specifications that drove the structure of this data element.
Control	0..1 This element is affected by the following invariants: ext-1
Type	markdown, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, string, oid, instant, ContactPoint, HumanName, Money, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
96. Extension.extension:alias
Slice Name	alias
Definition	DSTU2: `ElementDefinition.alias`
Short	DSTU2: aliasAdditional content defined by implementations
Comments	Element `ElementDefinition.alias` is mapped to FHIR R5 element `ElementDefinition.alias` as `Equivalent`.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Allows for better easier recognition of the element by multiple communities, including international communities. Element `ElementDefinition.alias` is mapped to FHIR R5 element `ElementDefinition.alias` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
98. Extension.extension:alias.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`alias`
100. Extension.extension:alias.value[x]
Definition	Identifies additional names by which this element might also be known. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Other namesValue of extension
Control	0..1 This element is affected by the following invariants: ext-1
Type	string, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
102. Extension.extension:min
Slice Name	min
Definition	DSTU2: `ElementDefinition.min` additional types (integer) additional types from child elements (value)
Short	DSTU2: min additional typesAdditional content defined by implementations
Comments	Element `ElementDefinition.min` is mapped to FHIR R5 element `ElementDefinition.min` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.min` do not cover the following types: integer. The mappings for `ElementDefinition.min` do not cover the following types based on type expansion: value.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.min` is mapped to FHIR R5 element `ElementDefinition.min` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.min` do not cover the following types: integer. The mappings for `ElementDefinition.min` do not cover the following types based on type expansion: value.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
104. Extension.extension:min.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`min`
106. Extension.extension:min.value[x]
Definition	The minimum number of times this element SHALL appear in the instance. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Minimum CardinalityValue of extension
Control	0..1 This element is affected by the following invariants: ext-1
Type	integer, date, Meta, Address, Attachment, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
108. Extension.extension:max
Slice Name	max
Definition	DSTU2: `ElementDefinition.max`
Short	DSTU2: maxAdditional content defined by implementations
Comments	Element `ElementDefinition.max` is mapped to FHIR R5 element `ElementDefinition.max` as `Equivalent`.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.max` is mapped to FHIR R5 element `ElementDefinition.max` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
110. Extension.extension:max.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`max`
112. Extension.extension:max.value[x]
Definition	The maximum number of times this element is permitted to appear in the instance. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Maximum Cardinality (a number or *)Value of extension
Control	0..1 This element is affected by the following invariants: ext-1
Type	string, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
114. Extension.extension:base
Slice Name	base
Definition	DSTU2: `ElementDefinition.base`
Short	DSTU2: baseAdditional content defined by implementations
Comments	Element `ElementDefinition.base` is mapped to FHIR R5 element `ElementDefinition.base` as `Equivalent`. The base information does not carry any information that could not be determined from the path and related profiles, but making this determination requires both that the related profiles are available, and that the algorithm to determine them be available. So they are deformalised into this location for tooling convenience, and to ensure that the base information is available without dependencies.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.base` is mapped to FHIR R5 element `ElementDefinition.base` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
116. Extension.extension:base.extension
Definition	An Extension May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	ExtensionAdditional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	30..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
118. Extension.extension:base.extension:path
Slice Name	path
Definition	DSTU2: `ElementDefinition.base.path`
Short	DSTU2: pathAdditional content defined by implementations
Comments	Element `ElementDefinition.base.path` is mapped to FHIR R5 element `ElementDefinition.base.path` as `Equivalent`.
Control	10..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.base.path` is mapped to FHIR R5 element `ElementDefinition.base.path` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
120. Extension.extension:base.extension:path.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`path`
122. Extension.extension:base.extension:path.value[x]
Definition	The Path that identifies the base element - this matches the ElementDefinition.path for that element. Across FHIR, there is only one base definition of any element - that is, an element definition on a StructureDefinition without a StructureDefinition.base. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Path that identifies the base elementValue of extension
Control	10..1 This element is affected by the following invariants: ext-1
Type	string, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
124. Extension.extension:base.extension:min
Slice Name	min
Definition	DSTU2: `ElementDefinition.base.min` additional types (integer) additional types from child elements (value)
Short	DSTU2: min additional typesAdditional content defined by implementations
Comments	Element `ElementDefinition.base.min` is mapped to FHIR R5 element `ElementDefinition.base.min` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.base.min` do not cover the following types: integer. The mappings for `ElementDefinition.base.min` do not cover the following types based on type expansion: value. This is provided for consistency with max, and may affect code generation of mandatory elements of the base resource are generated differently (some reference implementations have done this).
Control	10..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.base.min` is mapped to FHIR R5 element `ElementDefinition.base.min` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.base.min` do not cover the following types: integer. The mappings for `ElementDefinition.base.min` do not cover the following types based on type expansion: value.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
126. Extension.extension:base.extension:min.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`min`
128. Extension.extension:base.extension:min.value[x]
Definition	Minimum cardinality of the base element identified by the path. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Min cardinality of the base elementValue of extension
Comments	This is provided for consistency with max, and may affect code generation of mandatory elements of the base resource are generated differently (some reference implementations have done this).
Control	10..1 This element is affected by the following invariants: ext-1
Type	integer, date, Meta, Address, Attachment, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
130. Extension.extension:base.extension:max
Slice Name	max
Definition	DSTU2: `ElementDefinition.base.max`
Short	DSTU2: maxAdditional content defined by implementations
Comments	Element `ElementDefinition.base.max` is mapped to FHIR R5 element `ElementDefinition.base.max` as `Equivalent`. This is provided to code generation, since the wire representation in JSON differs depending on whether the base element has max > 1. Also, some forms of code generation may differ.
Control	10..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.base.max` is mapped to FHIR R5 element `ElementDefinition.base.max` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
132. Extension.extension:base.extension:max.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`max`
134. Extension.extension:base.extension:max.value[x]
Definition	Maximum cardinality of the base element identified by the path. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Max cardinality of the base elementValue of extension
Comments	This is provided to code generation, since the wire representation in JSON differs depending on whether the base element has max > 1. Also, some forms of code generation may differ.
Control	10..1 This element is affected by the following invariants: ext-1
Type	string, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
136. Extension.extension:base.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`base`
138. Extension.extension:base.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	0..01 This element is affected by the following invariants: ext-1
Type	Choice of: base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, integer64, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, CodeableReference, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, RatioRange, Reference, SampledData, Signature, Timing, ContactDetail, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Availability, ExtendedContactDetail, Dosage, Meta
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
140. Extension.extension:type
Slice Name	type
Definition	DSTU2: `ElementDefinition.type`
Short	DSTU2: typeAdditional content defined by implementations
Comments	Element `ElementDefinition.type` is mapped to FHIR R5 element `ElementDefinition.type` as `Equivalent`. The Type of the element can be left blank, in which case the type is inherited from the resource. The type can only be listed in this field if it is an allowed option in the base resource.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.type` is mapped to FHIR R5 element `ElementDefinition.type` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
142. Extension.extension:type.extension
Definition	An Extension May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	ExtensionAdditional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	10..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
144. Extension.extension:type.extension:code
Slice Name	code
Definition	DSTU2: `ElementDefinition.type.code` additional types (code) additional types from child elements (value)
Short	DSTU2: Name of Data type or Resource additional typesAdditional content defined by implementations
Comments	Element `ElementDefinition.type.code` is mapped to FHIR R5 element `ElementDefinition.type.code` as `RelatedTo`. The mappings for `ElementDefinition.type.code` do not cover the following types: code. The mappings for `ElementDefinition.type.code` do not cover the following types based on type expansion: value. If the element is a reference to another resource, this element contains "Reference", and the profile element refers to the profile of the allowed target of the resource, which may be a reference to the general definition of a resource (e.g. http://hl7.org/fhir/StructureDefinition/Patient). There would be one pair of type/code for each allowed target resource type.
Control	10..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.type.code` is mapped to FHIR R5 element `ElementDefinition.type.code` as `RelatedTo`. The mappings for `ElementDefinition.type.code` do not cover the following types: code. The mappings for `ElementDefinition.type.code` do not cover the following types based on type expansion: value.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
146. Extension.extension:type.extension:code.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`code`
148. Extension.extension:type.extension:code.value[x]
Definition	Name of Data type or Resource that is a(or the) type used for this element. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Name of Data type or ResourceValue of extension
Comments	If the element is a reference to another resource, this element contains "Reference", and the profile element refers to the profile of the allowed target of the resource, which may be a reference to the general definition of a resource (e.g. http://hl7.org/fhir/StructureDefinition/Patient). There would be one pair of type/code for each allowed target resource type.
Control	10..1 This element is affected by the following invariants: ext-1
Binding	The codes SHALL be taken from For codes, see R2DefinedTypesForR5 (0.1.0) (required to `http://hl7.org/fhir/uv/xver/ValueSet/R2-defined-types-for-R5\|0.1.0`) Either a resource or a data type.
Type	code, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
150. Extension.extension:type.extension:profile
Slice Name	profile
Definition	DSTU2: `ElementDefinition.type.profile`
Short	DSTU2: Profile (StructureDefinition) to apply (or IG)Additional content defined by implementations
Comments	Element `ElementDefinition.type.profile` is mapped to FHIR R5 element `ElementDefinition.type.profile` as `RelatedTo`.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.type.profile` is mapped to FHIR R5 element `ElementDefinition.type.profile` as `RelatedTo`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
152. Extension.extension:type.extension:profile.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`profile`
154. Extension.extension:type.extension:profile.value[x]
Definition	Identifies a profile structure or implementation Guide that SHALL hold for resources or datatypes referenced as the type of this element. Can be a local reference - to another structure in this profile, or a reference to a structure in another profile. When more than one profile is specified, the content must conform to all of them. When an implementation guide is specified, the resource SHALL conform to at least one profile defined in the implementation guide. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Profile (StructureDefinition) to apply (or IG)Value of extension
Control	0..1 This element is affected by the following invariants: ext-1
Type	uri, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
156. Extension.extension:type.extension:aggregation
Slice Name	aggregation
Definition	DSTU2: `ElementDefinition.type.aggregation`
Short	DSTU2: aggregationAdditional content defined by implementations
Comments	Element `ElementDefinition.type.aggregation` is mapped to FHIR R5 element `ElementDefinition.type.aggregation` as `Equivalent`.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.type.aggregation` is mapped to FHIR R5 element `ElementDefinition.type.aggregation` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
158. Extension.extension:type.extension:aggregation.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`aggregation`
160. Extension.extension:type.extension:aggregation.value[x]
Definition	If the type is a reference to another resource, how the resource is or can be aggregated - is it a contained resource, or a reference, and if the context is a bundle, is it included in the bundle. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	contained \| referenced \| bundled - how aggregatedValue of extension
Control	0..1 This element is affected by the following invariants: ext-1
Binding	The codes SHALL be taken from For codes, see AggregationMode (required to `http://hl7.org/fhir/ValueSet/resource-aggregation-mode\|5.0.0`) How resource references can be aggregated.
Type	code, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
162. Extension.extension:type.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`type`
164. Extension.extension:type.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	0..01 This element is affected by the following invariants: ext-1
Type	Choice of: base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, integer64, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, CodeableReference, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, RatioRange, Reference, SampledData, Signature, Timing, ContactDetail, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Availability, ExtendedContactDetail, Dosage, Meta
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
166. Extension.extension:nameReference
Slice Name	nameReference
Definition	DSTU2: `ElementDefinition.nameReference` additional types (string) additional types from child elements (value)
Short	DSTU2: To another element constraint (by element.name) additional typesAdditional content defined by implementations
Comments	Element `ElementDefinition.nameReference` is mapped to FHIR R5 element `ElementDefinition.contentReference` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.nameReference` do not cover the following types: string. The mappings for `ElementDefinition.nameReference` do not cover the following types based on type expansion: value. If child components of this element are defined, they act as constraints on the referenced slice.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.nameReference` is mapped to FHIR R5 element `ElementDefinition.contentReference` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.nameReference` do not cover the following types: string. The mappings for `ElementDefinition.nameReference` do not cover the following types based on type expansion: value.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
168. Extension.extension:nameReference.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`nameReference`
170. Extension.extension:nameReference.value[x]
Definition	Identifies the name of a slice defined elsewhere in the profile whose constraints should be applied to the current element. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	To another element constraint (by element.name)Value of extension
Comments	If child components of this element are defined, they act as constraints on the referenced slice.
Control	0..1 This element is affected by the following invariants: ext-1
Type	string, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
172. Extension.extension:defaultValue
Slice Name	defaultValue
Definition	DSTU2: `ElementDefinition.defaultValue[x]` additional types (Annotation, Attachment, Identifier, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Meta)
Short	DSTU2: Specified value it missing from instance additional typesAdditional content defined by implementations
Comments	Element `ElementDefinition.defaultValue[x]` is mapped to FHIR R5 element `ElementDefinition.defaultValue[x]` as `RelatedTo`. The mappings for `ElementDefinition.defaultValue[x]` do not cover the following types: Address, Annotation, Attachment, ContactPoint, HumanName, Identifier, Meta, Period, Range, Ratio, SampledData, Signature, Timing. The target context `ElementDefinition.defaultValue[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`. Default values can only be specified on a resource, data type, or extension definition, and never in a profile that applies to one of these. Specifying a default value means that the property can never been unknown - it must always have a value. Further, the default value can never be changed. For these reasons, default values are (and should be) used extremely sparingly.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.defaultValue[x]` is mapped to FHIR R5 element `ElementDefinition.defaultValue[x]` as `RelatedTo`. The mappings for `ElementDefinition.defaultValue[x]` do not cover the following types: Address, Annotation, Attachment, ContactPoint, HumanName, Identifier, Meta, Period, Range, Ratio, SampledData, Signature, Timing. The target context `ElementDefinition.defaultValue[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
174. Extension.extension:defaultValue.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`defaultValue`
176. Extension.extension:defaultValue.value[x]
Definition	The value that should be used if there is no value stated in the instance (e.g. 'if not otherwise specified, the abstract is false'). Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Specified value it missing from instanceValue of extension
Comments	Default values can only be specified on a resource, data type, or extension definition, and never in a profile that applies to one of these. Specifying a default value means that the property can never been unknown - it must always have a value. Further, the default value can never be changed. For these reasons, default values are (and should be) used extremely sparingly.
Control	0..1 This element is affected by the following invariants: ext-1
Type	Choice of: Annotation, Attachment, Identifier, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Meta, date, integer, Count, DataRequirement, Dosage, uuid, RatioRange, Coding, id, positiveInt, Distance, Availability, integer64, Duration, canonical, RelatedArtifact, base64Binary, UsageContext, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, string, oid, instant, Money, markdown, Age, Reference, TriggerDefinition, Quantity, uri, url, ContactDetail, boolean, Expression, CodeableReference, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
178. Extension.extension:meaningWhenMissing
Slice Name	meaningWhenMissing
Definition	DSTU2: `ElementDefinition.meaningWhenMissing`
Short	DSTU2: meaningWhenMissingAdditional content defined by implementations
Comments	Element `ElementDefinition.meaningWhenMissing` is mapped to FHIR R5 element `ElementDefinition.meaningWhenMissing` as `Equivalent`. Implicit meanings for missing values can only be specified on a resource, data type, or extension definition, and never in a profile that applies to one of these. An implicit meaning for a missing value can never be changed, and specifying one has the consequence that constraining its use in profiles eliminates use cases as possibilities, not merely moving them out of scope.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.meaningWhenMissing` is mapped to FHIR R5 element `ElementDefinition.meaningWhenMissing` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
180. Extension.extension:meaningWhenMissing.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`meaningWhenMissing`
182. Extension.extension:meaningWhenMissing.value[x]
Definition	The Implicit meaning that is to be understood when this element is missing (e.g. 'when this element is missing, the period is ongoing'. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Implicit meaning when this element is missingValue of extension
Comments	Implicit meanings for missing values can only be specified on a resource, data type, or extension definition, and never in a profile that applies to one of these. An implicit meaning for a missing value can never be changed, and specifying one has the consequence that constraining its use in profiles eliminates use cases as possibilities, not merely moving them out of scope.
Control	0..1 This element is affected by the following invariants: ext-1
Type	markdown, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, string, oid, instant, ContactPoint, HumanName, Money, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
184. Extension.extension:fixed
Slice Name	fixed
Definition	DSTU2: `ElementDefinition.fixed[x]` additional types (Annotation, Attachment, Identifier, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Meta)
Short	DSTU2: fixed additional typesAdditional content defined by implementations
Comments	Element `ElementDefinition.fixed[x]` is mapped to FHIR R5 element `ElementDefinition.fixed[x]` as `RelatedTo`. The mappings for `ElementDefinition.fixed[x]` do not cover the following types: Address, Annotation, Attachment, ContactPoint, HumanName, Identifier, Meta, Period, Range, Ratio, SampledData, Signature, Timing. The target context `ElementDefinition.fixed[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`. This is not recommended for Coding and CodeableConcept since these often have highly contextual properties such as version or display.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.fixed[x]` is mapped to FHIR R5 element `ElementDefinition.fixed[x]` as `RelatedTo`. The mappings for `ElementDefinition.fixed[x]` do not cover the following types: Address, Annotation, Attachment, ContactPoint, HumanName, Identifier, Meta, Period, Range, Ratio, SampledData, Signature, Timing. The target context `ElementDefinition.fixed[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
186. Extension.extension:fixed.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`fixed`
188. Extension.extension:fixed.value[x]
Definition	Specifies a value that SHALL be exactly the value for this element in the instance. For purposes of comparison, non-significant whitespace is ignored, and all values must be an exact match (case and accent sensitive). Missing elements/attributes must also be missing. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value must be exactly thisValue of extension
Comments	This is not recommended for Coding and CodeableConcept since these often have highly contextual properties such as version or display.
Control	0..1 This element is affected by the following invariants: ext-1
Type	Choice of: Annotation, Attachment, Identifier, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Meta, date, integer, Count, DataRequirement, Dosage, uuid, RatioRange, Coding, id, positiveInt, Distance, Availability, integer64, Duration, canonical, RelatedArtifact, base64Binary, UsageContext, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, string, oid, instant, Money, markdown, Age, Reference, TriggerDefinition, Quantity, uri, url, ContactDetail, boolean, Expression, CodeableReference, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
190. Extension.extension:pattern
Slice Name	pattern
Definition	DSTU2: `ElementDefinition.pattern[x]` additional types (Annotation, Attachment, Identifier, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Meta)
Short	DSTU2: pattern additional typesAdditional content defined by implementations
Comments	Element `ElementDefinition.pattern[x]` is mapped to FHIR R5 element `ElementDefinition.pattern[x]` as `RelatedTo`. The mappings for `ElementDefinition.pattern[x]` do not cover the following types: Address, Annotation, Attachment, ContactPoint, HumanName, Identifier, Meta, Period, Range, Ratio, SampledData, Signature, Timing. The target context `ElementDefinition.pattern[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`. Mostly used for fixing values of CodeableConcept. At present, pattern[x] is not recommended as a basis for slicing while issues related to this are investigated during the DSTU period.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.pattern[x]` is mapped to FHIR R5 element `ElementDefinition.pattern[x]` as `RelatedTo`. The mappings for `ElementDefinition.pattern[x]` do not cover the following types: Address, Annotation, Attachment, ContactPoint, HumanName, Identifier, Meta, Period, Range, Ratio, SampledData, Signature, Timing. The target context `ElementDefinition.pattern[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
192. Extension.extension:pattern.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`pattern`
194. Extension.extension:pattern.value[x]
Definition	Specifies a value that the value in the instance SHALL follow - that is, any value in the pattern must be found in the instance. Other additional values may be found too. This is effectively constraint by example. The values of elements present in the pattern must match exactly (case-sensitive, accent-sensitive, etc.). Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value must have at least these property valuesValue of extension
Comments	Mostly used for fixing values of CodeableConcept. At present, pattern[x] is not recommended as a basis for slicing while issues related to this are investigated during the DSTU period.
Control	0..1 This element is affected by the following invariants: ext-1
Type	Choice of: Annotation, Attachment, Identifier, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Meta, date, integer, Count, DataRequirement, Dosage, uuid, RatioRange, Coding, id, positiveInt, Distance, Availability, integer64, Duration, canonical, RelatedArtifact, base64Binary, UsageContext, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, string, oid, instant, Money, markdown, Age, Reference, TriggerDefinition, Quantity, uri, url, ContactDetail, boolean, Expression, CodeableReference, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
196. Extension.extension:example
Slice Name	example
Definition	DSTU2: `ElementDefinition.example[x]`
Short	DSTU2: Example value: [as defined for type]Additional content defined by implementations
Comments	Element `ElementDefinition.example[x]` is mapped to FHIR R5 element `ElementDefinition.example` as `SourceIsNarrowerThanTarget`. This will most commonly be present for data where it's not implicitly obvious from either the data type or value set what the values might be. (I.e. Example values for dates or quantities would generally be unnecessary.) If the example value is fully populated, the publication tool can generate an instance automatically.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.example[x]` is mapped to FHIR R5 element `ElementDefinition.example` as `SourceIsNarrowerThanTarget`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
198. Extension.extension:example.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`example`
200. Extension.extension:example.value[x]
Definition	A sample value for this element demonstrating the type of information that would typically be captured. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Example value: [as defined for type]Value of extension
Comments	This will most commonly be present for data where it's not implicitly obvious from either the data type or value set what the values might be. (I.e. Example values for dates or quantities would generally be unnecessary.) If the example value is fully populated, the publication tool can generate an instance automatically.
Control	0..1 This element is affected by the following invariants: ext-1
Type	Choice of: boolean, integer, decimal, base64Binary, instant, string, uri, date, dateTime, time, code, oid, id, unsignedInt, positiveInt, markdown, Annotation, Attachment, Identifier, CodeableConcept, Coding, Quantity, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Reference, Meta, Count, DataRequirement, Dosage, uuid, RatioRange, Distance, Availability, integer64, Duration, canonical, RelatedArtifact, UsageContext, ExtendedContactDetail, ParameterDefinition, Money, Age, TriggerDefinition, url, ContactDetail, Expression, CodeableReference
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
202. Extension.extension:minValue
Slice Name	minValue
Definition	DSTU2: `ElementDefinition.minValue[x]` additional types (boolean, base64Binary, string, uri, code, oid, id, markdown, Annotation, Attachment, Identifier, CodeableConcept, Coding, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Reference, Meta)
Short	DSTU2: minValue additional typesAdditional content defined by implementations
Comments	Element `ElementDefinition.minValue[x]` is mapped to FHIR R5 element `ElementDefinition.minValue[x]` as `RelatedTo`. The mappings for `ElementDefinition.minValue[x]` do not cover the following types: Address, Annotation, Attachment, base64Binary, boolean, code, CodeableConcept, Coding, ContactPoint, HumanName, id, Identifier, markdown, Meta, oid, Period, Range, Ratio, Reference, SampledData, Signature, string, Timing, uri. The target context `ElementDefinition.minValue[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`. Except for date/date/instant, the type of the minValue[x] SHALL be the same as the specified type of the element. For the date/dateTime/instant values, the type of minValue[x] SHALL be either the same, or a a Duration which specifies a relative time limit to the current time. The duration value is positive, and is subtracted from the current clock to determine the minimum allowable value. A minimum value for a Quantity is interpreted as an canonical minimum - e.g. you cannot provide 100mg if the minimum value is 10g.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.minValue[x]` is mapped to FHIR R5 element `ElementDefinition.minValue[x]` as `RelatedTo`. The mappings for `ElementDefinition.minValue[x]` do not cover the following types: Address, Annotation, Attachment, base64Binary, boolean, code, CodeableConcept, Coding, ContactPoint, HumanName, id, Identifier, markdown, Meta, oid, Period, Range, Ratio, Reference, SampledData, Signature, string, Timing, uri. The target context `ElementDefinition.minValue[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
204. Extension.extension:minValue.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`minValue`
206. Extension.extension:minValue.value[x]
Definition	The minimum allowed value for the element. The value is inclusive. This is allowed for the types date, dateTime, instant, time, decimal, integer, and Quantity. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Minimum Allowed Value (for some types)Value of extension
Comments	Except for date/date/instant, the type of the minValue[x] SHALL be the same as the specified type of the element. For the date/dateTime/instant values, the type of minValue[x] SHALL be either the same, or a a Duration which specifies a relative time limit to the current time. The duration value is positive, and is subtracted from the current clock to determine the minimum allowable value. A minimum value for a Quantity is interpreted as an canonical minimum - e.g. you cannot provide 100mg if the minimum value is 10g.
Control	0..1 This element is affected by the following invariants: ext-1
Type	Choice of: boolean, base64Binary, string, uri, code, oid, id, markdown, Annotation, Attachment, Identifier, CodeableConcept, Coding, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Reference, Meta, date, integer, Count, DataRequirement, Dosage, uuid, RatioRange, positiveInt, Distance, Availability, integer64, Duration, canonical, RelatedArtifact, UsageContext, decimal, ExtendedContactDetail, ParameterDefinition, dateTime, instant, Money, Age, TriggerDefinition, Quantity, url, ContactDetail, Expression, CodeableReference, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
208. Extension.extension:maxValue
Slice Name	maxValue
Definition	DSTU2: `ElementDefinition.maxValue[x]` additional types (boolean, base64Binary, string, uri, code, oid, id, markdown, Annotation, Attachment, Identifier, CodeableConcept, Coding, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Reference, Meta)
Short	DSTU2: maxValue additional typesAdditional content defined by implementations
Comments	Element `ElementDefinition.maxValue[x]` is mapped to FHIR R5 element `ElementDefinition.maxValue[x]` as `RelatedTo`. The mappings for `ElementDefinition.maxValue[x]` do not cover the following types: Address, Annotation, Attachment, base64Binary, boolean, code, CodeableConcept, Coding, ContactPoint, HumanName, id, Identifier, markdown, Meta, oid, Period, Range, Ratio, Reference, SampledData, Signature, string, Timing, uri. The target context `ElementDefinition.maxValue[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`. Except for date/date/instant, the type of the maxValue[x] SHALL be the same as the specified type of the element. For the date/dateTime/instant values, the type of maxValue[x] SHALL be either the same, or a a Duration which specifies a relative time limit to the current time. The duration value is positive, and is added to the current clock to determine the maximum allowable value. A maximum value for a Quantity is interpreted as an canonical maximum - e.g. you cannot provide 10g if the maximum value is 50mg.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.maxValue[x]` is mapped to FHIR R5 element `ElementDefinition.maxValue[x]` as `RelatedTo`. The mappings for `ElementDefinition.maxValue[x]` do not cover the following types: Address, Annotation, Attachment, base64Binary, boolean, code, CodeableConcept, Coding, ContactPoint, HumanName, id, Identifier, markdown, Meta, oid, Period, Range, Ratio, Reference, SampledData, Signature, string, Timing, uri. The target context `ElementDefinition.maxValue[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
210. Extension.extension:maxValue.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`maxValue`
212. Extension.extension:maxValue.value[x]
Definition	The maximum allowed value for the element. The value is inclusive. This is allowed for the types date, dateTime, instant, time, decimal, integer, and Quantity. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Maximum Allowed Value (for some types)Value of extension
Comments	Except for date/date/instant, the type of the maxValue[x] SHALL be the same as the specified type of the element. For the date/dateTime/instant values, the type of maxValue[x] SHALL be either the same, or a a Duration which specifies a relative time limit to the current time. The duration value is positive, and is added to the current clock to determine the maximum allowable value. A maximum value for a Quantity is interpreted as an canonical maximum - e.g. you cannot provide 10g if the maximum value is 50mg.
Control	0..1 This element is affected by the following invariants: ext-1
Type	Choice of: boolean, base64Binary, string, uri, code, oid, id, markdown, Annotation, Attachment, Identifier, CodeableConcept, Coding, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Reference, Meta, date, integer, Count, DataRequirement, Dosage, uuid, RatioRange, positiveInt, Distance, Availability, integer64, Duration, canonical, RelatedArtifact, UsageContext, decimal, ExtendedContactDetail, ParameterDefinition, dateTime, instant, Money, Age, TriggerDefinition, Quantity, url, ContactDetail, Expression, CodeableReference, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
214. Extension.extension:maxLength
Slice Name	maxLength
Definition	DSTU2: `ElementDefinition.maxLength`
Short	DSTU2: Max length for stringsAdditional content defined by implementations
Comments	Element `ElementDefinition.maxLength` is mapped to FHIR R5 element `ElementDefinition.maxLength` as `Equivalent`. Receivers are not required to reject instances that exceed the maximum length. The full length could be stored. In some cases, data might be truncated, though truncation should be undertaken with care and an understanding of the consequences of doing so. If not specified, there is no conformance expectation for length support.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.maxLength` is mapped to FHIR R5 element `ElementDefinition.maxLength` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
216. Extension.extension:maxLength.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`maxLength`
218. Extension.extension:maxLength.value[x]
Definition	Indicates the maximum length in characters that is permitted to be present in conformant instances and which is expected to be supported by conformant consumers that support the element. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Max length for stringsValue of extension
Comments	Receivers are not required to reject instances that exceed the maximum length. The full length could be stored. In some cases, data might be truncated, though truncation should be undertaken with care and an understanding of the consequences of doing so. If not specified, there is no conformance expectation for length support.
Control	0..1 This element is affected by the following invariants: ext-1
Type	integer, date, Meta, Address, Attachment, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
220. Extension.extension:condition
Slice Name	condition
Definition	DSTU2: `ElementDefinition.condition`
Short	DSTU2: conditionAdditional content defined by implementations
Comments	Element `ElementDefinition.condition` is mapped to FHIR R5 element `ElementDefinition.condition` as `Equivalent`.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.condition` is mapped to FHIR R5 element `ElementDefinition.condition` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
222. Extension.extension:condition.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`condition`
224. Extension.extension:condition.value[x]
Definition	A reference to an invariant that may make additional statements about the cardinality or value in the instance. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Reference to invariant about presenceValue of extension
Control	0..1 This element is affected by the following invariants: ext-1
Type	id, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
226. Extension.extension:constraint
Slice Name	constraint
Definition	DSTU2: `ElementDefinition.constraint`
Short	DSTU2: constraintAdditional content defined by implementations
Comments	Element `ElementDefinition.constraint` is mapped to FHIR R5 element `ElementDefinition.constraint` as `Equivalent`. Constraints should be declared on the "context" element - the lowest element in the hierarchy that is common to all nodes referenced by the constraint.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.constraint` is mapped to FHIR R5 element `ElementDefinition.constraint` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
228. Extension.extension:constraint.extension
Definition	An Extension May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	ExtensionAdditional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	40..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
230. Extension.extension:constraint.extension:key
Slice Name	key
Definition	DSTU2: `ElementDefinition.constraint.key`
Short	DSTU2: keyAdditional content defined by implementations
Comments	Element `ElementDefinition.constraint.key` is mapped to FHIR R5 element `ElementDefinition.constraint.key` as `Equivalent`.
Control	10..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.constraint.key` is mapped to FHIR R5 element `ElementDefinition.constraint.key` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
232. Extension.extension:constraint.extension:key.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`key`
234. Extension.extension:constraint.extension:key.value[x]
Definition	Allows identification of which elements have their cardinalities impacted by the constraint. Will not be referenced for constraints that do not affect cardinality. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Target of 'condition' reference aboveValue of extension
Control	10..1 This element is affected by the following invariants: ext-1
Type	id, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
236. Extension.extension:constraint.extension:requirements
Slice Name	requirements
Definition	DSTU2: `ElementDefinition.constraint.requirements`
Short	DSTU2: Why this constraint necessary or appropriateAdditional content defined by implementations
Comments	Element `ElementDefinition.constraint.requirements` is mapped to FHIR R5 element `ElementDefinition.constraint.requirements` as `Equivalent`. To be used if the reason for the constraint may not be intuitive to all implementers.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.constraint.requirements` is mapped to FHIR R5 element `ElementDefinition.constraint.requirements` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
238. Extension.extension:constraint.extension:requirements.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`requirements`
240. Extension.extension:constraint.extension:requirements.value[x]
Definition	Description of why this constraint is necessary or appropriate. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Why this constraint necessary or appropriateValue of extension
Comments	To be used if the reason for the constraint may not be intuitive to all implementers.
Control	0..1 This element is affected by the following invariants: ext-1
Type	string, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
242. Extension.extension:constraint.extension:severity
Slice Name	severity
Definition	DSTU2: `ElementDefinition.constraint.severity`
Short	DSTU2: severityAdditional content defined by implementations
Comments	Element `ElementDefinition.constraint.severity` is mapped to FHIR R5 element `ElementDefinition.constraint.severity` as `Equivalent`. This allows constraints to be asserted as "shall" (error) and "should" (warning).
Control	10..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.constraint.severity` is mapped to FHIR R5 element `ElementDefinition.constraint.severity` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
244. Extension.extension:constraint.extension:severity.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`severity`
246. Extension.extension:constraint.extension:severity.value[x]
Definition	Identifies the impact constraint violation has on the conformance of the instance. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	error \| warningValue of extension
Comments	This allows constraints to be asserted as "shall" (error) and "should" (warning).
Control	10..1 This element is affected by the following invariants: ext-1
Binding	The codes SHALL be taken from For codes, see ConstraintSeverity (required to `http://hl7.org/fhir/ValueSet/constraint-severity\|5.0.0`) SHALL applications comply with this constraint?
Type	code, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
248. Extension.extension:constraint.extension:human
Slice Name	human
Definition	DSTU2: `ElementDefinition.constraint.human`
Short	DSTU2: humanAdditional content defined by implementations
Comments	Element `ElementDefinition.constraint.human` is mapped to FHIR R5 element `ElementDefinition.constraint.human` as `Equivalent`. Should be expressed in business terms as much as possible.
Control	10..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.constraint.human` is mapped to FHIR R5 element `ElementDefinition.constraint.human` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
250. Extension.extension:constraint.extension:human.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`human`
252. Extension.extension:constraint.extension:human.value[x]
Definition	Text that can be used to describe the constraint in messages identifying that the constraint has been violated. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Human description of constraintValue of extension
Comments	Should be expressed in business terms as much as possible.
Control	10..1 This element is affected by the following invariants: ext-1
Type	string, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
254. Extension.extension:constraint.extension:xpath
Slice Name	xpath
Definition	DSTU2: `ElementDefinition.constraint.xpath` (new:string)
Short	DSTU2: XPath expression of constraint (new)Additional content defined by implementations
Comments	Element `ElementDefinition.constraint.xpath` has a context of ElementDefinition.constraint based on following the parent source element upwards and mapping to `ElementDefinition`. Element `ElementDefinition.constraint.xpath` has no mapping targets in FHIR R5. Typically, this is because the element has been added (is a new element). Elements SHALL use "f" as the namespace prefix for the FHIR namespace, and "x" for the xhtml namespace, and SHALL NOT use any other prefixes.
Control	10..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Used in Schematron tests of the validity of the resource. Element `ElementDefinition.constraint.xpath` has a context of ElementDefinition.constraint based on following the parent source element upwards and mapping to `ElementDefinition`. Element `ElementDefinition.constraint.xpath` has no mapping targets in FHIR R5. Typically, this is because the element has been added (is a new element).
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
256. Extension.extension:constraint.extension:xpath.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`xpath`
258. Extension.extension:constraint.extension:xpath.value[x]
Definition	An XPath expression of constraint that can be executed to see if this constraint is met. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	XPath expression of constraintValue of extension
Comments	Elements SHALL use "f" as the namespace prefix for the FHIR namespace, and "x" for the xhtml namespace, and SHALL NOT use any other prefixes.
Control	10..1 This element is affected by the following invariants: ext-1
Type	string, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
260. Extension.extension:constraint.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`constraint`
262. Extension.extension:constraint.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	0..01 This element is affected by the following invariants: ext-1
Type	Choice of: base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, integer64, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, CodeableReference, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, RatioRange, Reference, SampledData, Signature, Timing, ContactDetail, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Availability, ExtendedContactDetail, Dosage, Meta
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
264. Extension.extension:mustSupport
Slice Name	mustSupport
Definition	DSTU2: `ElementDefinition.mustSupport`
Short	DSTU2: If the element must supportedAdditional content defined by implementations
Comments	Element `ElementDefinition.mustSupport` is mapped to FHIR R5 element `ElementDefinition.mustSupport` as `Equivalent`. "Something useful" is context dependent and impossible to describe in the base FHIR specification. For this reason, tue mustSupport flag is never set to true by the FHIR specification itself - it is only set to true in profiles. This is done in Resource Profiles, where the profile labels an element as mustSupport=true. When a profile does this, it SHALL also make clear exactly what kind of "support" is required, as this can mean many things. Note that an element that has the property IsModifier is not necessarily a "key" element (e.g. one of the important elements to make use of the resource), nor is it automatically mustSupport - however both of these things are more likely to be true for IsModifier elements than for other elements.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Allows a profile to set expectations for system capabilities beyond merely respecting cardinality constraints. Element `ElementDefinition.mustSupport` is mapped to FHIR R5 element `ElementDefinition.mustSupport` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
266. Extension.extension:mustSupport.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`mustSupport`
268. Extension.extension:mustSupport.value[x]
Definition	If true, implementations that produce or consume resources SHALL provide "support" for the element in some meaningful way. If false, the element may be ignored and not supported. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	If the element must supportedValue of extension
Comments	"Something useful" is context dependent and impossible to describe in the base FHIR specification. For this reason, tue mustSupport flag is never set to true by the FHIR specification itself - it is only set to true in profiles. This is done in Resource Profiles, where the profile labels an element as mustSupport=true. When a profile does this, it SHALL also make clear exactly what kind of "support" is required, as this can mean many things. Note that an element that has the property IsModifier is not necessarily a "key" element (e.g. one of the important elements to make use of the resource), nor is it automatically mustSupport - however both of these things are more likely to be true for IsModifier elements than for other elements.
Control	0..1 This element is affected by the following invariants: ext-1
Type	boolean, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
270. Extension.extension:isModifier
Slice Name	isModifier
Definition	DSTU2: `ElementDefinition.isModifier`
Short	DSTU2: isModifierAdditional content defined by implementations
Comments	Element `ElementDefinition.isModifier` is mapped to FHIR R5 element `ElementDefinition.isModifier` as `Equivalent`. Only the definition of an element can set IsModifier true - either the specification itself or where an extension is originally defined. Once set, it cannot be changed in derived profiles. An element/extension that has isModifier=true SHOULD also have a minimum cardinality of 1, so that there is no lack of clarity about what to do if it is missing. If it can be missing, the definition SHALL make the meaning of a missing element clear.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Allows elements to be introduced into a specification that can't safely be ignored by applications that don't recognize them. Element `ElementDefinition.isModifier` is mapped to FHIR R5 element `ElementDefinition.isModifier` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
272. Extension.extension:isModifier.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`isModifier`
274. Extension.extension:isModifier.value[x]
Definition	If true, the value of this element affects the interpretation of the element or resource that contains it, and the value of the element cannot be ignored. Typically, this is used for status, negation and qualification codes. The effect of this is that the element cannot be ignored by systems: they SHALL either recognize the element and process it, and/or a pre-determination has been made that it is not relevant to their particular system. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	If this modifies the meaning of other elementsValue of extension
Comments	Only the definition of an element can set IsModifier true - either the specification itself or where an extension is originally defined. Once set, it cannot be changed in derived profiles. An element/extension that has isModifier=true SHOULD also have a minimum cardinality of 1, so that there is no lack of clarity about what to do if it is missing. If it can be missing, the definition SHALL make the meaning of a missing element clear.
Control	0..1 This element is affected by the following invariants: ext-1
Type	boolean, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
276. Extension.extension:isSummary
Slice Name	isSummary
Definition	DSTU2: `ElementDefinition.isSummary`
Short	DSTU2: isSummaryAdditional content defined by implementations
Comments	Element `ElementDefinition.isSummary` is mapped to FHIR R5 element `ElementDefinition.isSummary` as `Equivalent`. Some resources include a set of simple metadata, and some very large data. This element is used to reduce the quantity of data returned in searches. Note that servers may pre-cache summarized resources for optimal performance, so servers may not support per-profile use of the isSummary flag.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Allow clients to search through large resources quickly. Element `ElementDefinition.isSummary` is mapped to FHIR R5 element `ElementDefinition.isSummary` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
278. Extension.extension:isSummary.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`isSummary`
280. Extension.extension:isSummary.value[x]
Definition	Whether the element should be included if a client requests a search with the parameter _summary=true. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Include when _summary = true?Value of extension
Comments	Some resources include a set of simple metadata, and some very large data. This element is used to reduce the quantity of data returned in searches. Note that servers may pre-cache summarized resources for optimal performance, so servers may not support per-profile use of the isSummary flag.
Control	0..1 This element is affected by the following invariants: ext-1
Type	boolean, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
282. Extension.extension:binding
Slice Name	binding
Definition	DSTU2: `ElementDefinition.binding`
Short	DSTU2: bindingAdditional content defined by implementations
Comments	Element `ElementDefinition.binding` is mapped to FHIR R5 element `ElementDefinition.binding` as `Equivalent`.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.binding` is mapped to FHIR R5 element `ElementDefinition.binding` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
284. Extension.extension:binding.extension
Definition	An Extension May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	ExtensionAdditional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	10..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
286. Extension.extension:binding.extension:strength
Slice Name	strength
Definition	DSTU2: `ElementDefinition.binding.strength`
Short	DSTU2: strengthAdditional content defined by implementations
Comments	Element `ElementDefinition.binding.strength` is mapped to FHIR R5 element `ElementDefinition.binding.strength` as `Equivalent`. For further discussion, see Using Terminologies.
Control	10..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.binding.strength` is mapped to FHIR R5 element `ElementDefinition.binding.strength` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
288. Extension.extension:binding.extension:strength.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`strength`
290. Extension.extension:binding.extension:strength.value[x]
Definition	Indicates the degree of conformance expectations associated with this binding - that is, the degree to which the provided value set must be adhered to in the instances. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	required \| extensible \| preferred \| exampleValue of extension
Comments	For further discussion, see Using Terminologies.
Control	10..1 This element is affected by the following invariants: ext-1
Binding	The codes SHALL be taken from For codes, see BindingStrength (required to `http://hl7.org/fhir/ValueSet/binding-strength\|5.0.0`) Indication of the degree of conformance expectations associated with a binding.
Type	code, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
292. Extension.extension:binding.extension:description
Slice Name	description
Definition	DSTU2: `ElementDefinition.binding.description`
Short	DSTU2: Human explanation of the value setAdditional content defined by implementations
Comments	Element `ElementDefinition.binding.description` is mapped to FHIR R5 element `ElementDefinition.binding.description` as `Equivalent`.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.binding.description` is mapped to FHIR R5 element `ElementDefinition.binding.description` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
294. Extension.extension:binding.extension:description.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`description`
296. Extension.extension:binding.extension:description.value[x]
Definition	Describes the intended use of this particular set of codes. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Human explanation of the value setValue of extension
Control	0..1 This element is affected by the following invariants: ext-1
Type	string, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
298. Extension.extension:binding.extension:valueSet
Slice Name	valueSet
Definition	DSTU2: `ElementDefinition.binding.valueSet[x]` additional types (Reference(http://hl7.org/fhir/StructureDefinition/ValueSet)) additional types from child elements (display, reference)
Short	DSTU2: Source of value set additional typesAdditional content defined by implementations
Comments	Element `ElementDefinition.binding.valueSet[x]` is mapped to FHIR R5 element `ElementDefinition.binding.valueSet` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.binding.valueSet[x]` do not cover the following types: Reference. The mappings for `ElementDefinition.binding.valueSet[x]` do not cover the following types based on type expansion: display, reference. For value sets with a referenceResource, the display can contain the value set description. The reference may be version-specific or not.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.binding.valueSet[x]` is mapped to FHIR R5 element `ElementDefinition.binding.valueSet` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.binding.valueSet[x]` do not cover the following types: Reference. The mappings for `ElementDefinition.binding.valueSet[x]` do not cover the following types based on type expansion: display, reference.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
300. Extension.extension:binding.extension:valueSet.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`valueSet`
302. Extension.extension:binding.extension:valueSet.value[x]
Definition	Points to the value set or external definition (e.g. implicit value set) that identifies the set of codes to be used. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Source of value setValue of extension
Comments	For value sets with a referenceResource, the display can contain the value set description. The reference may be version-specific or not.
Control	0..1 This element is affected by the following invariants: ext-1
Type	Reference(Cross-version Profile for DSTU2.ValueSet for use in FHIR R5, ValueSet), date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
304. Extension.extension:binding.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`binding`
306. Extension.extension:binding.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	0..01 This element is affected by the following invariants: ext-1
Type	Choice of: base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, integer64, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, CodeableReference, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, RatioRange, Reference, SampledData, Signature, Timing, ContactDetail, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Availability, ExtendedContactDetail, Dosage, Meta
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
308. Extension.extension:mapping
Slice Name	mapping
Definition	DSTU2: `ElementDefinition.mapping`
Short	DSTU2: mappingAdditional content defined by implementations
Comments	Element `ElementDefinition.mapping` is mapped to FHIR R5 element `ElementDefinition.mapping` as `Equivalent`. Mappings are not necessarily specific enough for safe translation.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Provides guidance to implementers familiar with or converting content from other specifications. Element `ElementDefinition.mapping` is mapped to FHIR R5 element `ElementDefinition.mapping` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
310. Extension.extension:mapping.extension
Definition	An Extension May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	ExtensionAdditional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	20..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
312. Extension.extension:mapping.extension:identity
Slice Name	identity
Definition	DSTU2: `ElementDefinition.mapping.identity`
Short	DSTU2: identityAdditional content defined by implementations
Comments	Element `ElementDefinition.mapping.identity` is mapped to FHIR R5 element `ElementDefinition.mapping.identity` as `Equivalent`.
Control	10..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.mapping.identity` is mapped to FHIR R5 element `ElementDefinition.mapping.identity` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
314. Extension.extension:mapping.extension:identity.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`identity`
316. Extension.extension:mapping.extension:identity.value[x]
Definition	An internal reference to the definition of a mapping. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Reference to mapping declarationValue of extension
Control	10..1 This element is affected by the following invariants: ext-1
Type	id, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
318. Extension.extension:mapping.extension:language
Slice Name	language
Definition	DSTU2: `ElementDefinition.mapping.language`
Short	DSTU2: languageAdditional content defined by implementations
Comments	Element `ElementDefinition.mapping.language` is mapped to FHIR R5 element `ElementDefinition.mapping.language` as `Equivalent`. If omitted, then there can be no expectation of computational interpretation of the mapping.
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.mapping.language` is mapped to FHIR R5 element `ElementDefinition.mapping.language` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
320. Extension.extension:mapping.extension:language.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`language`
322. Extension.extension:mapping.extension:language.value[x]
Definition	Identifies the computable language in which mapping.map is expressed. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Computable language of mappingValue of extension
Comments	If omitted, then there can be no expectation of computational interpretation of the mapping.
Control	0..1 This element is affected by the following invariants: ext-1
Type	code, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
324. Extension.extension:mapping.extension:map
Slice Name	map
Definition	DSTU2: `ElementDefinition.mapping.map`
Short	DSTU2: mapAdditional content defined by implementations
Comments	Element `ElementDefinition.mapping.map` is mapped to FHIR R5 element `ElementDefinition.mapping.map` as `Equivalent`. For most mappings, the syntax is undefined. Syntax will be provided for mappings to the RIM. Multiple mappings may be possible and may include constraints on other resource elements that identify when a particular mapping applies.
Control	10..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.mapping.map` is mapped to FHIR R5 element `ElementDefinition.mapping.map` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
326. Extension.extension:mapping.extension:map.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`map`
328. Extension.extension:mapping.extension:map.value[x]
Definition	Expresses what part of the target specification corresponds to this element. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Details of the mappingValue of extension
Comments	For most mappings, the syntax is undefined. Syntax will be provided for mappings to the RIM. Multiple mappings may be possible and may include constraints on other resource elements that identify when a particular mapping applies.
Control	10..1 This element is affected by the following invariants: ext-1
Type	string, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, code, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
330. Extension.extension:mapping.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`mapping`
332. Extension.extension:mapping.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	0..01 This element is affected by the following invariants: ext-1
Type	Choice of: base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, integer64, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, CodeableReference, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, RatioRange, Reference, SampledData, Signature, Timing, ContactDetail, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Availability, ExtendedContactDetail, Dosage, Meta
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
334. Extension.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`http://hl7.org/fhir/1.0/StructureDefinition/extension-StructureDefinition.differential.element`
336. Extension.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	0..01 This element is affected by the following invariants: ext-1
Type	Choice of: base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, integer64, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, CodeableReference, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, RatioRange, Reference, SampledData, Signature, Timing, ContactDetail, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Availability, ExtendedContactDetail, Dosage, Meta
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))

Guidance on how to interpret the contents of this table can be foundhere

0. Extension
Definition	DSTU2: `StructureDefinition.differential.element` additional types (ElementDefinition) additional types from child elements (alias, base, max, min, path, binding, description, strength, valueSet[x], code, comments, condition, constraint, human, key, requirements, severity, xpath, defaultValue[x], definition, example[x], fixed[x], isModifier, isSummary, label, mapping, identity, language, map, maxLength, maxValue[x], meaningWhenMissing, minValue[x], mustSupport, name, nameReference, pattern[x], representation, short, slicing, discriminator, ordered, rules, type, aggregation, profile)
Short	DSTU2: element additional types
Comments	Element `StructureDefinition.differential.element` is mapped to FHIR R5 element `StructureDefinition.differential.element` as `SourceIsBroaderThanTarget`. The mappings for `StructureDefinition.differential.element` do not cover the following types: ElementDefinition. The mappings for `StructureDefinition.differential.element` do not cover the following types based on type expansion: aggregation, alias, base, binding, code, comments, condition, constraint, defaultValue[x], definition, description, discriminator, example[x], fixed[x], human, identity, isModifier, isSummary, key, label, language, map, mapping, max, maxLength, maxValue[x], meaningWhenMissing, min, minValue[x], mustSupport, name, nameReference, ordered, path, pattern[x], profile, representation, requirements, rules, severity, short, slicing, strength, type, valueSet[x], xpath.
Control	1..*
Is Modifier	false
2. Extension.extension
Control	1..*
Slicing	This element introduces a set of slices on `Extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
4. Extension.extension:_datatype
Slice Name	_datatype
Definition	Slice to indicate the presence of a DSTU2 `ElementDefinition` in FHIR R5
Short	DataType slice for a FHIR DSTU2 `ElementDefinition` value
Control	1..1
6. Extension.extension:_datatype.url
Control	1..1
Fixed Value	`http://hl7.org/fhir/StructureDefinition/_datatype`
8. Extension.extension:_datatype.value[x]
Comments	Must be: ElementDefinition
Control	1..1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Fixed Value	`ElementDefinition`
10. Extension.extension:path
Slice Name	path
Definition	DSTU2: `ElementDefinition.path`
Short	DSTU2: The path of the element (see the Detailed Descriptions)
Comments	Element `ElementDefinition.path` is mapped to FHIR R5 element `ElementDefinition.path` as `Equivalent`.
Control	1..1
Requirements	Element `ElementDefinition.path` is mapped to FHIR R5 element `ElementDefinition.path` as `Equivalent`.
12. Extension.extension:path.url
Control	1..1
Fixed Value	`path`
14. Extension.extension:path.value[x]
Definition	The path identifies the element and is expressed as a "."-separated list of ancestor elements, beginning with the name of the resource or extension.
Short	The path of the element (see the Detailed Descriptions)
Control	1..1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
16. Extension.extension:representation
Slice Name	representation
Definition	DSTU2: `ElementDefinition.representation` additional codes
Short	DSTU2: How this element is represented in instances additional codes
Comments	Element `ElementDefinition.representation` is mapped to FHIR R5 element `ElementDefinition.representation` as `SourceIsNarrowerThanTarget`. The mappings for `ElementDefinition.representation` do not allow expression of the necessary codes, per the bindings on the source and target. This is rarely used except for special cases where the representation deviates from the normal, which is done only very reluctantly, and can only be done in the base standard (and profiles must reproduce what the base standard does).
Control	0..*
Requirements	Element `ElementDefinition.representation` is mapped to FHIR R5 element `ElementDefinition.representation` as `SourceIsNarrowerThanTarget`. The mappings for `ElementDefinition.representation` do not allow expression of the necessary codes, per the bindings on the source and target.
18. Extension.extension:representation.url
Control	1..1
Fixed Value	`representation`
20. Extension.extension:representation.value[x]
Definition	Codes that define how this element is represented in instances, when the deviation varies from the normal case.
Short	How this element is represented in instances
Comments	This is rarely used except for special cases where the representation deviates from the normal, which is done only very reluctantly, and can only be done in the base standard (and profiles must reproduce what the base standard does).
Control	0..1
Binding	The codes SHALL be taken from PropertyRepresentation (required to `http://hl7.org/fhir/ValueSet/property-representation\|5.0.0`) How a property is represented on the wire.
Type	code
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
22. Extension.extension:name
Slice Name	name
Definition	DSTU2: `ElementDefinition.name`
Short	DSTU2: Name for this particular element definition (reference target)
Comments	Element `ElementDefinition.name` is mapped to FHIR R5 element `ElementDefinition.sliceName` as `Equivalent`. The name SHALL be unique within the structure within the context of the constrained resource element. (Though to avoid confusion, uniqueness across all elements is recommended.).
Control	0..1
Requirements	Allows referencing a defined element. May also be used for code generation purposes. Element `ElementDefinition.name` is mapped to FHIR R5 element `ElementDefinition.sliceName` as `Equivalent`.
24. Extension.extension:name.url
Control	1..1
Fixed Value	`name`
26. Extension.extension:name.value[x]
Definition	The name of this element definition (to refer to it from other element definitions using ElementDefinition.nameReference). This is a unique name referring to a specific set of constraints applied to this element. One use of this is to provide a name to different slices of the same element.
Short	Name for this particular element definition (reference target)
Comments	The name SHALL be unique within the structure within the context of the constrained resource element. (Though to avoid confusion, uniqueness across all elements is recommended.).
Control	0..1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
28. Extension.extension:label
Slice Name	label
Definition	DSTU2: `ElementDefinition.label`
Short	DSTU2: label
Comments	Element `ElementDefinition.label` is mapped to FHIR R5 element `ElementDefinition.label` as `Equivalent`. Question and label serve similar purposes in they both can be used to prompt for capturing a data element. Whether the question form or label form should be used will depend on the type of instrument being used to capture the information.
Control	0..1
Requirements	Element `ElementDefinition.label` is mapped to FHIR R5 element `ElementDefinition.label` as `Equivalent`.
30. Extension.extension:label.url
Control	1..1
Fixed Value	`label`
32. Extension.extension:label.value[x]
Definition	The text to display beside the element indicating its meaning or to use to prompt for the element in a user display or form.
Short	Name for element to display with or prompt for element
Comments	Question and label serve similar purposes in they both can be used to prompt for capturing a data element. Whether the question form or label form should be used will depend on the type of instrument being used to capture the information.
Control	0..1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
34. Extension.extension:code
Slice Name	code
Definition	DSTU2: `ElementDefinition.code`
Short	DSTU2: Defining code
Comments	Element `ElementDefinition.code` is mapped to FHIR R5 element `ElementDefinition.code` as `Equivalent`. The data element definition and other constraints SHALL be a proper constraint on the meaning (as defined in the code system, including relationships) of any code listed here. Where multiple codes exist in a terminology that could correspond to the data element, the most granular code(s) should be selected, so long as they are not more restrictive than the data element itself.
Control	0..*
Requirements	Links the meaning of an element to an external terminology. Element `ElementDefinition.code` is mapped to FHIR R5 element `ElementDefinition.code` as `Equivalent`.
36. Extension.extension:code.url
Control	1..1
Fixed Value	`code`
38. Extension.extension:code.value[x]
Definition	A code that provides the meaning for the element according to a particular terminology.
Short	Defining code
Comments	The data element definition and other constraints SHALL be a proper constraint on the meaning (as defined in the code system, including relationships) of any code listed here. Where multiple codes exist in a terminology that could correspond to the data element, the most granular code(s) should be selected, so long as they are not more restrictive than the data element itself.
Control	0..1
Type	Coding
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
40. Extension.extension:slicing
Slice Name	slicing
Definition	DSTU2: `ElementDefinition.slicing`
Short	DSTU2: slicing
Comments	Element `ElementDefinition.slicing` is mapped to FHIR R5 element `ElementDefinition.slicing` as `Equivalent`. The first element in the sequence, the one that carries the slicing, is the unconstrained element, for reference purposes . This may include the unconstrained children.
Control	0..1
Requirements	Element `ElementDefinition.slicing` is mapped to FHIR R5 element `ElementDefinition.slicing` as `Equivalent`.
42. Extension.extension:slicing.extension
Control	1..*
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
44. Extension.extension:slicing.extension:discriminator
Slice Name	discriminator
Definition	DSTU2: `ElementDefinition.slicing.discriminator`
Short	DSTU2: Element values that used to distinguish the slices
Comments	Element `ElementDefinition.slicing.discriminator` is mapped to FHIR R5 element `ElementDefinition.slicing.discriminator` as `Equivalent`. If there is no discriminator, the content is hard to process, so this should be avoided. If the base element has a cardinality of ..1, and there is a choice of types, the discriminator most be "@type".
Control	0..*
Requirements	Element `ElementDefinition.slicing.discriminator` is mapped to FHIR R5 element `ElementDefinition.slicing.discriminator` as `Equivalent`.
46. Extension.extension:slicing.extension:discriminator.url
Control	1..1
Fixed Value	`discriminator`
48. Extension.extension:slicing.extension:discriminator.value[x]
Definition	Designates which child elements are used to discriminate between the slices when processing an instance. If one or more discriminators are provided, the value of the child elements in the instance data SHALL completely distinguish which slice the element in the resource matches based on the allowed values for those elements in each of the slices.
Short	Element values that used to distinguish the slices
Comments	If there is no discriminator, the content is hard to process, so this should be avoided. If the base element has a cardinality of ..1, and there is a choice of types, the discriminator most be "@type".
Control	0..1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
50. Extension.extension:slicing.extension:description
Slice Name	description
Definition	DSTU2: `ElementDefinition.slicing.description`
Short	DSTU2: description
Comments	Element `ElementDefinition.slicing.description` is mapped to FHIR R5 element `ElementDefinition.slicing.description` as `Equivalent`. If it's really not possible to differentiate them, the design should be re-evaluated to make the content usable.
Control	0..1
Requirements	Element `ElementDefinition.slicing.description` is mapped to FHIR R5 element `ElementDefinition.slicing.description` as `Equivalent`.
52. Extension.extension:slicing.extension:description.url
Control	1..1
Fixed Value	`description`
54. Extension.extension:slicing.extension:description.value[x]
Definition	A human-readable text description of how the slicing works. If there is no discriminator, this is required to be present to provide whatever information is possible about how the slices can be differentiated.
Short	Text description of how slicing works (or not)
Comments	If it's really not possible to differentiate them, the design should be re-evaluated to make the content usable.
Control	0..1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
56. Extension.extension:slicing.extension:ordered
Slice Name	ordered
Definition	DSTU2: `ElementDefinition.slicing.ordered`
Short	DSTU2: ordered
Comments	Element `ElementDefinition.slicing.ordered` is mapped to FHIR R5 element `ElementDefinition.slicing.ordered` as `Equivalent`. Order should only be required when it is a pressing concern for presentation. Profile authors should consider making the order a feature of the rules about the narrative, not the rules about the data - requiring ordered data makes the profile much less re-usable.
Control	0..1
Requirements	Element `ElementDefinition.slicing.ordered` is mapped to FHIR R5 element `ElementDefinition.slicing.ordered` as `Equivalent`.
58. Extension.extension:slicing.extension:ordered.url
Control	1..1
Fixed Value	`ordered`
60. Extension.extension:slicing.extension:ordered.value[x]
Definition	If the matching elements have to occur in the same order as defined in the profile.
Short	If elements must be in same order as slices
Comments	Order should only be required when it is a pressing concern for presentation. Profile authors should consider making the order a feature of the rules about the narrative, not the rules about the data - requiring ordered data makes the profile much less re-usable.
Control	0..1
Type	boolean
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
62. Extension.extension:slicing.extension:rules
Slice Name	rules
Definition	DSTU2: `ElementDefinition.slicing.rules`
Short	DSTU2: rules
Comments	Element `ElementDefinition.slicing.rules` is mapped to FHIR R5 element `ElementDefinition.slicing.rules` as `Equivalent`. Allowing additional elements makes for a much for flexible template - it's open for use in wider contexts, but also means that the content of the resource is not closed, and applications have to decide how to handle content not described by the profile.
Control	1..1
Requirements	Element `ElementDefinition.slicing.rules` is mapped to FHIR R5 element `ElementDefinition.slicing.rules` as `Equivalent`.
64. Extension.extension:slicing.extension:rules.url
Control	1..1
Fixed Value	`rules`
66. Extension.extension:slicing.extension:rules.value[x]
Definition	Whether additional slices are allowed or not. When the slices are ordered, profile authors can also say that additional slices are only allowed at the end.
Short	closed \| open \| openAtEnd
Comments	Allowing additional elements makes for a much for flexible template - it's open for use in wider contexts, but also means that the content of the resource is not closed, and applications have to decide how to handle content not described by the profile.
Control	1..1
Binding	The codes SHALL be taken from SlicingRules (required to `http://hl7.org/fhir/ValueSet/resource-slicing-rules\|5.0.0`) How slices are interpreted when evaluating an instance.
Type	code
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
68. Extension.extension:slicing.url
Control	1..1
Fixed Value	`slicing`
70. Extension.extension:slicing.value[x]
Control	0..0
72. Extension.extension:short
Slice Name	short
Definition	DSTU2: `ElementDefinition.short`
Short	DSTU2: Concise definition for xml presentation
Comments	Element `ElementDefinition.short` is mapped to FHIR R5 element `ElementDefinition.short` as `Equivalent`. May change the term to provide language more appropriate to the context of the profile or to reflect slicing.
Control	0..1
Requirements	Element `ElementDefinition.short` is mapped to FHIR R5 element `ElementDefinition.short` as `Equivalent`.
74. Extension.extension:short.url
Control	1..1
Fixed Value	`short`
76. Extension.extension:short.value[x]
Definition	A concise description of what this element means (e.g. for use in autogenerated summaries).
Short	Concise definition for xml presentation
Comments	May change the term to provide language more appropriate to the context of the profile or to reflect slicing.
Control	0..1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
78. Extension.extension:definition
Slice Name	definition
Definition	DSTU2: `ElementDefinition.definition`
Short	DSTU2: definition
Comments	Element `ElementDefinition.definition` is mapped to FHIR R5 element `ElementDefinition.definition` as `Equivalent`. It is easy for a different definition to change the meaning of an element and this can have nasty downstream consequences. Please be careful when providing definitions.
Control	0..1
Requirements	To allow a user to state the usage of an element in a particular context. Element `ElementDefinition.definition` is mapped to FHIR R5 element `ElementDefinition.definition` as `Equivalent`.
80. Extension.extension:definition.url
Control	1..1
Fixed Value	`definition`
82. Extension.extension:definition.value[x]
Definition	Provides a complete explanation of the meaning of the data element for human readability. For the case of elements derived from existing elements (e.g. constraints), the definition SHALL be consistent with the base definition, but convey the meaning of the element in the particular context of use of the resource.
Short	Full formal definition as narrative text
Comments	It is easy for a different definition to change the meaning of an element and this can have nasty downstream consequences. Please be careful when providing definitions.
Control	0..1
Type	markdown
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
84. Extension.extension:comments
Slice Name	comments
Definition	DSTU2: `ElementDefinition.comments`
Short	DSTU2: comments
Comments	Element `ElementDefinition.comments` is mapped to FHIR R5 element `ElementDefinition.comment` as `Equivalent`. If it is possible to capture usage rules using constraints, that mechanism should be used in preference to this element.
Control	0..1
Requirements	Element `ElementDefinition.comments` is mapped to FHIR R5 element `ElementDefinition.comment` as `Equivalent`.
86. Extension.extension:comments.url
Control	1..1
Fixed Value	`comments`
88. Extension.extension:comments.value[x]
Definition	Explanatory notes and implementation guidance about the data element, including notes about how to use the data properly, exceptions to proper use, etc.
Short	Comments about the use of this element
Comments	If it is possible to capture usage rules using constraints, that mechanism should be used in preference to this element.
Control	0..1
Type	markdown
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
90. Extension.extension:requirements
Slice Name	requirements
Definition	DSTU2: `ElementDefinition.requirements`
Short	DSTU2: Why is this needed?
Comments	Element `ElementDefinition.requirements` is mapped to FHIR R5 element `ElementDefinition.requirements` as `Equivalent`. This element does not describe the usage of the element (that's done in comments), rather it's for traceability of why the element is either needed or why the constraints exist as they do. This may be used to point to source materials or specifications that drove the structure of this data element.
Control	0..1
Requirements	Element `ElementDefinition.requirements` is mapped to FHIR R5 element `ElementDefinition.requirements` as `Equivalent`.
92. Extension.extension:requirements.url
Control	1..1
Fixed Value	`requirements`
94. Extension.extension:requirements.value[x]
Definition	This element is for traceability of why the element was created and why the constraints exist as they do. This may be used to point to source materials or specifications that drove the structure of this element.
Short	Why is this needed?
Comments	This element does not describe the usage of the element (that's done in comments), rather it's for traceability of why the element is either needed or why the constraints exist as they do. This may be used to point to source materials or specifications that drove the structure of this data element.
Control	0..1
Type	markdown
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
96. Extension.extension:alias
Slice Name	alias
Definition	DSTU2: `ElementDefinition.alias`
Short	DSTU2: alias
Comments	Element `ElementDefinition.alias` is mapped to FHIR R5 element `ElementDefinition.alias` as `Equivalent`.
Control	0..*
Requirements	Allows for better easier recognition of the element by multiple communities, including international communities. Element `ElementDefinition.alias` is mapped to FHIR R5 element `ElementDefinition.alias` as `Equivalent`.
98. Extension.extension:alias.url
Control	1..1
Fixed Value	`alias`
100. Extension.extension:alias.value[x]
Definition	Identifies additional names by which this element might also be known.
Short	Other names
Control	0..1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
102. Extension.extension:min
Slice Name	min
Definition	DSTU2: `ElementDefinition.min` additional types (integer) additional types from child elements (value)
Short	DSTU2: min additional types
Comments	Element `ElementDefinition.min` is mapped to FHIR R5 element `ElementDefinition.min` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.min` do not cover the following types: integer. The mappings for `ElementDefinition.min` do not cover the following types based on type expansion: value.
Control	0..1
Requirements	Element `ElementDefinition.min` is mapped to FHIR R5 element `ElementDefinition.min` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.min` do not cover the following types: integer. The mappings for `ElementDefinition.min` do not cover the following types based on type expansion: value.
104. Extension.extension:min.url
Control	1..1
Fixed Value	`min`
106. Extension.extension:min.value[x]
Definition	The minimum number of times this element SHALL appear in the instance.
Short	Minimum Cardinality
Control	0..1
Type	integer
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
108. Extension.extension:max
Slice Name	max
Definition	DSTU2: `ElementDefinition.max`
Short	DSTU2: max
Comments	Element `ElementDefinition.max` is mapped to FHIR R5 element `ElementDefinition.max` as `Equivalent`.
Control	0..1
Requirements	Element `ElementDefinition.max` is mapped to FHIR R5 element `ElementDefinition.max` as `Equivalent`.
110. Extension.extension:max.url
Control	1..1
Fixed Value	`max`
112. Extension.extension:max.value[x]
Definition	The maximum number of times this element is permitted to appear in the instance.
Short	Maximum Cardinality (a number or *)
Control	0..1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
114. Extension.extension:base
Slice Name	base
Definition	DSTU2: `ElementDefinition.base`
Short	DSTU2: base
Comments	Element `ElementDefinition.base` is mapped to FHIR R5 element `ElementDefinition.base` as `Equivalent`. The base information does not carry any information that could not be determined from the path and related profiles, but making this determination requires both that the related profiles are available, and that the algorithm to determine them be available. So they are deformalised into this location for tooling convenience, and to ensure that the base information is available without dependencies.
Control	0..1
Requirements	Element `ElementDefinition.base` is mapped to FHIR R5 element `ElementDefinition.base` as `Equivalent`.
116. Extension.extension:base.extension
Control	3..*
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
118. Extension.extension:base.extension:path
Slice Name	path
Definition	DSTU2: `ElementDefinition.base.path`
Short	DSTU2: path
Comments	Element `ElementDefinition.base.path` is mapped to FHIR R5 element `ElementDefinition.base.path` as `Equivalent`.
Control	1..1
Requirements	Element `ElementDefinition.base.path` is mapped to FHIR R5 element `ElementDefinition.base.path` as `Equivalent`.
120. Extension.extension:base.extension:path.url
Control	1..1
Fixed Value	`path`
122. Extension.extension:base.extension:path.value[x]
Definition	The Path that identifies the base element - this matches the ElementDefinition.path for that element. Across FHIR, there is only one base definition of any element - that is, an element definition on a StructureDefinition without a StructureDefinition.base.
Short	Path that identifies the base element
Control	1..1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
124. Extension.extension:base.extension:min
Slice Name	min
Definition	DSTU2: `ElementDefinition.base.min` additional types (integer) additional types from child elements (value)
Short	DSTU2: min additional types
Comments	Element `ElementDefinition.base.min` is mapped to FHIR R5 element `ElementDefinition.base.min` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.base.min` do not cover the following types: integer. The mappings for `ElementDefinition.base.min` do not cover the following types based on type expansion: value. This is provided for consistency with max, and may affect code generation of mandatory elements of the base resource are generated differently (some reference implementations have done this).
Control	1..1
Requirements	Element `ElementDefinition.base.min` is mapped to FHIR R5 element `ElementDefinition.base.min` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.base.min` do not cover the following types: integer. The mappings for `ElementDefinition.base.min` do not cover the following types based on type expansion: value.
126. Extension.extension:base.extension:min.url
Control	1..1
Fixed Value	`min`
128. Extension.extension:base.extension:min.value[x]
Definition	Minimum cardinality of the base element identified by the path.
Short	Min cardinality of the base element
Comments	This is provided for consistency with max, and may affect code generation of mandatory elements of the base resource are generated differently (some reference implementations have done this).
Control	1..1
Type	integer
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
130. Extension.extension:base.extension:max
Slice Name	max
Definition	DSTU2: `ElementDefinition.base.max`
Short	DSTU2: max
Comments	Element `ElementDefinition.base.max` is mapped to FHIR R5 element `ElementDefinition.base.max` as `Equivalent`. This is provided to code generation, since the wire representation in JSON differs depending on whether the base element has max > 1. Also, some forms of code generation may differ.
Control	1..1
Requirements	Element `ElementDefinition.base.max` is mapped to FHIR R5 element `ElementDefinition.base.max` as `Equivalent`.
132. Extension.extension:base.extension:max.url
Control	1..1
Fixed Value	`max`
134. Extension.extension:base.extension:max.value[x]
Definition	Maximum cardinality of the base element identified by the path.
Short	Max cardinality of the base element
Comments	This is provided to code generation, since the wire representation in JSON differs depending on whether the base element has max > 1. Also, some forms of code generation may differ.
Control	1..1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
136. Extension.extension:base.url
Control	1..1
Fixed Value	`base`
138. Extension.extension:base.value[x]
Control	0..0
140. Extension.extension:type
Slice Name	type
Definition	DSTU2: `ElementDefinition.type`
Short	DSTU2: type
Comments	Element `ElementDefinition.type` is mapped to FHIR R5 element `ElementDefinition.type` as `Equivalent`. The Type of the element can be left blank, in which case the type is inherited from the resource. The type can only be listed in this field if it is an allowed option in the base resource.
Control	0..*
Requirements	Element `ElementDefinition.type` is mapped to FHIR R5 element `ElementDefinition.type` as `Equivalent`.
142. Extension.extension:type.extension
Control	1..*
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
144. Extension.extension:type.extension:code
Slice Name	code
Definition	DSTU2: `ElementDefinition.type.code` additional types (code) additional types from child elements (value)
Short	DSTU2: Name of Data type or Resource additional types
Comments	Element `ElementDefinition.type.code` is mapped to FHIR R5 element `ElementDefinition.type.code` as `RelatedTo`. The mappings for `ElementDefinition.type.code` do not cover the following types: code. The mappings for `ElementDefinition.type.code` do not cover the following types based on type expansion: value. If the element is a reference to another resource, this element contains "Reference", and the profile element refers to the profile of the allowed target of the resource, which may be a reference to the general definition of a resource (e.g. http://hl7.org/fhir/StructureDefinition/Patient). There would be one pair of type/code for each allowed target resource type.
Control	1..1
Requirements	Element `ElementDefinition.type.code` is mapped to FHIR R5 element `ElementDefinition.type.code` as `RelatedTo`. The mappings for `ElementDefinition.type.code` do not cover the following types: code. The mappings for `ElementDefinition.type.code` do not cover the following types based on type expansion: value.
146. Extension.extension:type.extension:code.url
Control	1..1
Fixed Value	`code`
148. Extension.extension:type.extension:code.value[x]
Definition	Name of Data type or Resource that is a(or the) type used for this element.
Short	Name of Data type or Resource
Comments	If the element is a reference to another resource, this element contains "Reference", and the profile element refers to the profile of the allowed target of the resource, which may be a reference to the general definition of a resource (e.g. http://hl7.org/fhir/StructureDefinition/Patient). There would be one pair of type/code for each allowed target resource type.
Control	1..1
Binding	The codes SHALL be taken from R2DefinedTypesForR5 (0.1.0) (required to `http://hl7.org/fhir/uv/xver/ValueSet/R2-defined-types-for-R5\|0.1.0`) Either a resource or a data type.
Type	code
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
150. Extension.extension:type.extension:profile
Slice Name	profile
Definition	DSTU2: `ElementDefinition.type.profile`
Short	DSTU2: Profile (StructureDefinition) to apply (or IG)
Comments	Element `ElementDefinition.type.profile` is mapped to FHIR R5 element `ElementDefinition.type.profile` as `RelatedTo`.
Control	0..*
Requirements	Element `ElementDefinition.type.profile` is mapped to FHIR R5 element `ElementDefinition.type.profile` as `RelatedTo`.
152. Extension.extension:type.extension:profile.url
Control	1..1
Fixed Value	`profile`
154. Extension.extension:type.extension:profile.value[x]
Definition	Identifies a profile structure or implementation Guide that SHALL hold for resources or datatypes referenced as the type of this element. Can be a local reference - to another structure in this profile, or a reference to a structure in another profile. When more than one profile is specified, the content must conform to all of them. When an implementation guide is specified, the resource SHALL conform to at least one profile defined in the implementation guide.
Short	Profile (StructureDefinition) to apply (or IG)
Control	0..1
Type	uri
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
156. Extension.extension:type.extension:aggregation
Slice Name	aggregation
Definition	DSTU2: `ElementDefinition.type.aggregation`
Short	DSTU2: aggregation
Comments	Element `ElementDefinition.type.aggregation` is mapped to FHIR R5 element `ElementDefinition.type.aggregation` as `Equivalent`.
Control	0..*
Requirements	Element `ElementDefinition.type.aggregation` is mapped to FHIR R5 element `ElementDefinition.type.aggregation` as `Equivalent`.
158. Extension.extension:type.extension:aggregation.url
Control	1..1
Fixed Value	`aggregation`
160. Extension.extension:type.extension:aggregation.value[x]
Definition	If the type is a reference to another resource, how the resource is or can be aggregated - is it a contained resource, or a reference, and if the context is a bundle, is it included in the bundle.
Short	contained \| referenced \| bundled - how aggregated
Control	0..1
Binding	The codes SHALL be taken from AggregationMode (required to `http://hl7.org/fhir/ValueSet/resource-aggregation-mode\|5.0.0`) How resource references can be aggregated.
Type	code
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
162. Extension.extension:type.url
Control	1..1
Fixed Value	`type`
164. Extension.extension:type.value[x]
Control	0..0
166. Extension.extension:nameReference
Slice Name	nameReference
Definition	DSTU2: `ElementDefinition.nameReference` additional types (string) additional types from child elements (value)
Short	DSTU2: To another element constraint (by element.name) additional types
Comments	Element `ElementDefinition.nameReference` is mapped to FHIR R5 element `ElementDefinition.contentReference` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.nameReference` do not cover the following types: string. The mappings for `ElementDefinition.nameReference` do not cover the following types based on type expansion: value. If child components of this element are defined, they act as constraints on the referenced slice.
Control	0..1
Requirements	Element `ElementDefinition.nameReference` is mapped to FHIR R5 element `ElementDefinition.contentReference` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.nameReference` do not cover the following types: string. The mappings for `ElementDefinition.nameReference` do not cover the following types based on type expansion: value.
168. Extension.extension:nameReference.url
Control	1..1
Fixed Value	`nameReference`
170. Extension.extension:nameReference.value[x]
Definition	Identifies the name of a slice defined elsewhere in the profile whose constraints should be applied to the current element.
Short	To another element constraint (by element.name)
Comments	If child components of this element are defined, they act as constraints on the referenced slice.
Control	0..1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
172. Extension.extension:defaultValue
Slice Name	defaultValue
Definition	DSTU2: `ElementDefinition.defaultValue[x]` additional types (Annotation, Attachment, Identifier, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Meta)
Short	DSTU2: Specified value it missing from instance additional types
Comments	Element `ElementDefinition.defaultValue[x]` is mapped to FHIR R5 element `ElementDefinition.defaultValue[x]` as `RelatedTo`. The mappings for `ElementDefinition.defaultValue[x]` do not cover the following types: Address, Annotation, Attachment, ContactPoint, HumanName, Identifier, Meta, Period, Range, Ratio, SampledData, Signature, Timing. The target context `ElementDefinition.defaultValue[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`. Default values can only be specified on a resource, data type, or extension definition, and never in a profile that applies to one of these. Specifying a default value means that the property can never been unknown - it must always have a value. Further, the default value can never be changed. For these reasons, default values are (and should be) used extremely sparingly.
Control	0..1
Requirements	Element `ElementDefinition.defaultValue[x]` is mapped to FHIR R5 element `ElementDefinition.defaultValue[x]` as `RelatedTo`. The mappings for `ElementDefinition.defaultValue[x]` do not cover the following types: Address, Annotation, Attachment, ContactPoint, HumanName, Identifier, Meta, Period, Range, Ratio, SampledData, Signature, Timing. The target context `ElementDefinition.defaultValue[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`.
174. Extension.extension:defaultValue.url
Control	1..1
Fixed Value	`defaultValue`
176. Extension.extension:defaultValue.value[x]
Definition	The value that should be used if there is no value stated in the instance (e.g. 'if not otherwise specified, the abstract is false').
Short	Specified value it missing from instance
Comments	Default values can only be specified on a resource, data type, or extension definition, and never in a profile that applies to one of these. Specifying a default value means that the property can never been unknown - it must always have a value. Further, the default value can never be changed. For these reasons, default values are (and should be) used extremely sparingly.
Control	0..1
Type	Choice of: Annotation, Attachment, Identifier, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Meta
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
178. Extension.extension:meaningWhenMissing
Slice Name	meaningWhenMissing
Definition	DSTU2: `ElementDefinition.meaningWhenMissing`
Short	DSTU2: meaningWhenMissing
Comments	Element `ElementDefinition.meaningWhenMissing` is mapped to FHIR R5 element `ElementDefinition.meaningWhenMissing` as `Equivalent`. Implicit meanings for missing values can only be specified on a resource, data type, or extension definition, and never in a profile that applies to one of these. An implicit meaning for a missing value can never be changed, and specifying one has the consequence that constraining its use in profiles eliminates use cases as possibilities, not merely moving them out of scope.
Control	0..1
Requirements	Element `ElementDefinition.meaningWhenMissing` is mapped to FHIR R5 element `ElementDefinition.meaningWhenMissing` as `Equivalent`.
180. Extension.extension:meaningWhenMissing.url
Control	1..1
Fixed Value	`meaningWhenMissing`
182. Extension.extension:meaningWhenMissing.value[x]
Definition	The Implicit meaning that is to be understood when this element is missing (e.g. 'when this element is missing, the period is ongoing'.
Short	Implicit meaning when this element is missing
Comments	Implicit meanings for missing values can only be specified on a resource, data type, or extension definition, and never in a profile that applies to one of these. An implicit meaning for a missing value can never be changed, and specifying one has the consequence that constraining its use in profiles eliminates use cases as possibilities, not merely moving them out of scope.
Control	0..1
Type	markdown
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
184. Extension.extension:fixed
Slice Name	fixed
Definition	DSTU2: `ElementDefinition.fixed[x]` additional types (Annotation, Attachment, Identifier, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Meta)
Short	DSTU2: fixed additional types
Comments	Element `ElementDefinition.fixed[x]` is mapped to FHIR R5 element `ElementDefinition.fixed[x]` as `RelatedTo`. The mappings for `ElementDefinition.fixed[x]` do not cover the following types: Address, Annotation, Attachment, ContactPoint, HumanName, Identifier, Meta, Period, Range, Ratio, SampledData, Signature, Timing. The target context `ElementDefinition.fixed[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`. This is not recommended for Coding and CodeableConcept since these often have highly contextual properties such as version or display.
Control	0..1
Requirements	Element `ElementDefinition.fixed[x]` is mapped to FHIR R5 element `ElementDefinition.fixed[x]` as `RelatedTo`. The mappings for `ElementDefinition.fixed[x]` do not cover the following types: Address, Annotation, Attachment, ContactPoint, HumanName, Identifier, Meta, Period, Range, Ratio, SampledData, Signature, Timing. The target context `ElementDefinition.fixed[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`.
186. Extension.extension:fixed.url
Control	1..1
Fixed Value	`fixed`
188. Extension.extension:fixed.value[x]
Definition	Specifies a value that SHALL be exactly the value for this element in the instance. For purposes of comparison, non-significant whitespace is ignored, and all values must be an exact match (case and accent sensitive). Missing elements/attributes must also be missing.
Short	Value must be exactly this
Comments	This is not recommended for Coding and CodeableConcept since these often have highly contextual properties such as version or display.
Control	0..1
Type	Choice of: Annotation, Attachment, Identifier, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Meta
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
190. Extension.extension:pattern
Slice Name	pattern
Definition	DSTU2: `ElementDefinition.pattern[x]` additional types (Annotation, Attachment, Identifier, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Meta)
Short	DSTU2: pattern additional types
Comments	Element `ElementDefinition.pattern[x]` is mapped to FHIR R5 element `ElementDefinition.pattern[x]` as `RelatedTo`. The mappings for `ElementDefinition.pattern[x]` do not cover the following types: Address, Annotation, Attachment, ContactPoint, HumanName, Identifier, Meta, Period, Range, Ratio, SampledData, Signature, Timing. The target context `ElementDefinition.pattern[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`. Mostly used for fixing values of CodeableConcept. At present, pattern[x] is not recommended as a basis for slicing while issues related to this are investigated during the DSTU period.
Control	0..1
Requirements	Element `ElementDefinition.pattern[x]` is mapped to FHIR R5 element `ElementDefinition.pattern[x]` as `RelatedTo`. The mappings for `ElementDefinition.pattern[x]` do not cover the following types: Address, Annotation, Attachment, ContactPoint, HumanName, Identifier, Meta, Period, Range, Ratio, SampledData, Signature, Timing. The target context `ElementDefinition.pattern[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`.
192. Extension.extension:pattern.url
Control	1..1
Fixed Value	`pattern`
194. Extension.extension:pattern.value[x]
Definition	Specifies a value that the value in the instance SHALL follow - that is, any value in the pattern must be found in the instance. Other additional values may be found too. This is effectively constraint by example. The values of elements present in the pattern must match exactly (case-sensitive, accent-sensitive, etc.).
Short	Value must have at least these property values
Comments	Mostly used for fixing values of CodeableConcept. At present, pattern[x] is not recommended as a basis for slicing while issues related to this are investigated during the DSTU period.
Control	0..1
Type	Choice of: Annotation, Attachment, Identifier, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Meta
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
196. Extension.extension:example
Slice Name	example
Definition	DSTU2: `ElementDefinition.example[x]`
Short	DSTU2: Example value: [as defined for type]
Comments	Element `ElementDefinition.example[x]` is mapped to FHIR R5 element `ElementDefinition.example` as `SourceIsNarrowerThanTarget`. This will most commonly be present for data where it's not implicitly obvious from either the data type or value set what the values might be. (I.e. Example values for dates or quantities would generally be unnecessary.) If the example value is fully populated, the publication tool can generate an instance automatically.
Control	0..1
Requirements	Element `ElementDefinition.example[x]` is mapped to FHIR R5 element `ElementDefinition.example` as `SourceIsNarrowerThanTarget`.
198. Extension.extension:example.url
Control	1..1
Fixed Value	`example`
200. Extension.extension:example.value[x]
Definition	A sample value for this element demonstrating the type of information that would typically be captured.
Short	Example value: [as defined for type]
Comments	This will most commonly be present for data where it's not implicitly obvious from either the data type or value set what the values might be. (I.e. Example values for dates or quantities would generally be unnecessary.) If the example value is fully populated, the publication tool can generate an instance automatically.
Control	0..1
Type	Choice of: boolean, integer, decimal, base64Binary, instant, string, uri, date, dateTime, time, code, oid, id, unsignedInt, positiveInt, markdown, Annotation, Attachment, Identifier, CodeableConcept, Coding, Quantity, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Reference, Meta
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
202. Extension.extension:minValue
Slice Name	minValue
Definition	DSTU2: `ElementDefinition.minValue[x]` additional types (boolean, base64Binary, string, uri, code, oid, id, markdown, Annotation, Attachment, Identifier, CodeableConcept, Coding, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Reference, Meta)
Short	DSTU2: minValue additional types
Comments	Element `ElementDefinition.minValue[x]` is mapped to FHIR R5 element `ElementDefinition.minValue[x]` as `RelatedTo`. The mappings for `ElementDefinition.minValue[x]` do not cover the following types: Address, Annotation, Attachment, base64Binary, boolean, code, CodeableConcept, Coding, ContactPoint, HumanName, id, Identifier, markdown, Meta, oid, Period, Range, Ratio, Reference, SampledData, Signature, string, Timing, uri. The target context `ElementDefinition.minValue[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`. Except for date/date/instant, the type of the minValue[x] SHALL be the same as the specified type of the element. For the date/dateTime/instant values, the type of minValue[x] SHALL be either the same, or a a Duration which specifies a relative time limit to the current time. The duration value is positive, and is subtracted from the current clock to determine the minimum allowable value. A minimum value for a Quantity is interpreted as an canonical minimum - e.g. you cannot provide 100mg if the minimum value is 10g.
Control	0..1
Requirements	Element `ElementDefinition.minValue[x]` is mapped to FHIR R5 element `ElementDefinition.minValue[x]` as `RelatedTo`. The mappings for `ElementDefinition.minValue[x]` do not cover the following types: Address, Annotation, Attachment, base64Binary, boolean, code, CodeableConcept, Coding, ContactPoint, HumanName, id, Identifier, markdown, Meta, oid, Period, Range, Ratio, Reference, SampledData, Signature, string, Timing, uri. The target context `ElementDefinition.minValue[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`.
204. Extension.extension:minValue.url
Control	1..1
Fixed Value	`minValue`
206. Extension.extension:minValue.value[x]
Definition	The minimum allowed value for the element. The value is inclusive. This is allowed for the types date, dateTime, instant, time, decimal, integer, and Quantity.
Short	Minimum Allowed Value (for some types)
Comments	Except for date/date/instant, the type of the minValue[x] SHALL be the same as the specified type of the element. For the date/dateTime/instant values, the type of minValue[x] SHALL be either the same, or a a Duration which specifies a relative time limit to the current time. The duration value is positive, and is subtracted from the current clock to determine the minimum allowable value. A minimum value for a Quantity is interpreted as an canonical minimum - e.g. you cannot provide 100mg if the minimum value is 10g.
Control	0..1
Type	Choice of: boolean, base64Binary, string, uri, code, oid, id, markdown, Annotation, Attachment, Identifier, CodeableConcept, Coding, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Reference, Meta
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
208. Extension.extension:maxValue
Slice Name	maxValue
Definition	DSTU2: `ElementDefinition.maxValue[x]` additional types (boolean, base64Binary, string, uri, code, oid, id, markdown, Annotation, Attachment, Identifier, CodeableConcept, Coding, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Reference, Meta)
Short	DSTU2: maxValue additional types
Comments	Element `ElementDefinition.maxValue[x]` is mapped to FHIR R5 element `ElementDefinition.maxValue[x]` as `RelatedTo`. The mappings for `ElementDefinition.maxValue[x]` do not cover the following types: Address, Annotation, Attachment, base64Binary, boolean, code, CodeableConcept, Coding, ContactPoint, HumanName, id, Identifier, markdown, Meta, oid, Period, Range, Ratio, Reference, SampledData, Signature, string, Timing, uri. The target context `ElementDefinition.maxValue[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`. Except for date/date/instant, the type of the maxValue[x] SHALL be the same as the specified type of the element. For the date/dateTime/instant values, the type of maxValue[x] SHALL be either the same, or a a Duration which specifies a relative time limit to the current time. The duration value is positive, and is added to the current clock to determine the maximum allowable value. A maximum value for a Quantity is interpreted as an canonical maximum - e.g. you cannot provide 10g if the maximum value is 50mg.
Control	0..1
Requirements	Element `ElementDefinition.maxValue[x]` is mapped to FHIR R5 element `ElementDefinition.maxValue[x]` as `RelatedTo`. The mappings for `ElementDefinition.maxValue[x]` do not cover the following types: Address, Annotation, Attachment, base64Binary, boolean, code, CodeableConcept, Coding, ContactPoint, HumanName, id, Identifier, markdown, Meta, oid, Period, Range, Ratio, Reference, SampledData, Signature, string, Timing, uri. The target context `ElementDefinition.maxValue[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`.
210. Extension.extension:maxValue.url
Control	1..1
Fixed Value	`maxValue`
212. Extension.extension:maxValue.value[x]
Definition	The maximum allowed value for the element. The value is inclusive. This is allowed for the types date, dateTime, instant, time, decimal, integer, and Quantity.
Short	Maximum Allowed Value (for some types)
Comments	Except for date/date/instant, the type of the maxValue[x] SHALL be the same as the specified type of the element. For the date/dateTime/instant values, the type of maxValue[x] SHALL be either the same, or a a Duration which specifies a relative time limit to the current time. The duration value is positive, and is added to the current clock to determine the maximum allowable value. A maximum value for a Quantity is interpreted as an canonical maximum - e.g. you cannot provide 10g if the maximum value is 50mg.
Control	0..1
Type	Choice of: boolean, base64Binary, string, uri, code, oid, id, markdown, Annotation, Attachment, Identifier, CodeableConcept, Coding, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Reference, Meta
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
214. Extension.extension:maxLength
Slice Name	maxLength
Definition	DSTU2: `ElementDefinition.maxLength`
Short	DSTU2: Max length for strings
Comments	Element `ElementDefinition.maxLength` is mapped to FHIR R5 element `ElementDefinition.maxLength` as `Equivalent`. Receivers are not required to reject instances that exceed the maximum length. The full length could be stored. In some cases, data might be truncated, though truncation should be undertaken with care and an understanding of the consequences of doing so. If not specified, there is no conformance expectation for length support.
Control	0..1
Requirements	Element `ElementDefinition.maxLength` is mapped to FHIR R5 element `ElementDefinition.maxLength` as `Equivalent`.
216. Extension.extension:maxLength.url
Control	1..1
Fixed Value	`maxLength`
218. Extension.extension:maxLength.value[x]
Definition	Indicates the maximum length in characters that is permitted to be present in conformant instances and which is expected to be supported by conformant consumers that support the element.
Short	Max length for strings
Comments	Receivers are not required to reject instances that exceed the maximum length. The full length could be stored. In some cases, data might be truncated, though truncation should be undertaken with care and an understanding of the consequences of doing so. If not specified, there is no conformance expectation for length support.
Control	0..1
Type	integer
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
220. Extension.extension:condition
Slice Name	condition
Definition	DSTU2: `ElementDefinition.condition`
Short	DSTU2: condition
Comments	Element `ElementDefinition.condition` is mapped to FHIR R5 element `ElementDefinition.condition` as `Equivalent`.
Control	0..*
Requirements	Element `ElementDefinition.condition` is mapped to FHIR R5 element `ElementDefinition.condition` as `Equivalent`.
222. Extension.extension:condition.url
Control	1..1
Fixed Value	`condition`
224. Extension.extension:condition.value[x]
Definition	A reference to an invariant that may make additional statements about the cardinality or value in the instance.
Short	Reference to invariant about presence
Control	0..1
Type	id
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
226. Extension.extension:constraint
Slice Name	constraint
Definition	DSTU2: `ElementDefinition.constraint`
Short	DSTU2: constraint
Comments	Element `ElementDefinition.constraint` is mapped to FHIR R5 element `ElementDefinition.constraint` as `Equivalent`. Constraints should be declared on the "context" element - the lowest element in the hierarchy that is common to all nodes referenced by the constraint.
Control	0..*
Requirements	Element `ElementDefinition.constraint` is mapped to FHIR R5 element `ElementDefinition.constraint` as `Equivalent`.
228. Extension.extension:constraint.extension
Control	4..*
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
230. Extension.extension:constraint.extension:key
Slice Name	key
Definition	DSTU2: `ElementDefinition.constraint.key`
Short	DSTU2: key
Comments	Element `ElementDefinition.constraint.key` is mapped to FHIR R5 element `ElementDefinition.constraint.key` as `Equivalent`.
Control	1..1
Requirements	Element `ElementDefinition.constraint.key` is mapped to FHIR R5 element `ElementDefinition.constraint.key` as `Equivalent`.
232. Extension.extension:constraint.extension:key.url
Control	1..1
Fixed Value	`key`
234. Extension.extension:constraint.extension:key.value[x]
Definition	Allows identification of which elements have their cardinalities impacted by the constraint. Will not be referenced for constraints that do not affect cardinality.
Short	Target of 'condition' reference above
Control	1..1
Type	id
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
236. Extension.extension:constraint.extension:requirements
Slice Name	requirements
Definition	DSTU2: `ElementDefinition.constraint.requirements`
Short	DSTU2: Why this constraint necessary or appropriate
Comments	Element `ElementDefinition.constraint.requirements` is mapped to FHIR R5 element `ElementDefinition.constraint.requirements` as `Equivalent`. To be used if the reason for the constraint may not be intuitive to all implementers.
Control	0..1
Requirements	Element `ElementDefinition.constraint.requirements` is mapped to FHIR R5 element `ElementDefinition.constraint.requirements` as `Equivalent`.
238. Extension.extension:constraint.extension:requirements.url
Control	1..1
Fixed Value	`requirements`
240. Extension.extension:constraint.extension:requirements.value[x]
Definition	Description of why this constraint is necessary or appropriate.
Short	Why this constraint necessary or appropriate
Comments	To be used if the reason for the constraint may not be intuitive to all implementers.
Control	0..1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
242. Extension.extension:constraint.extension:severity
Slice Name	severity
Definition	DSTU2: `ElementDefinition.constraint.severity`
Short	DSTU2: severity
Comments	Element `ElementDefinition.constraint.severity` is mapped to FHIR R5 element `ElementDefinition.constraint.severity` as `Equivalent`. This allows constraints to be asserted as "shall" (error) and "should" (warning).
Control	1..1
Requirements	Element `ElementDefinition.constraint.severity` is mapped to FHIR R5 element `ElementDefinition.constraint.severity` as `Equivalent`.
244. Extension.extension:constraint.extension:severity.url
Control	1..1
Fixed Value	`severity`
246. Extension.extension:constraint.extension:severity.value[x]
Definition	Identifies the impact constraint violation has on the conformance of the instance.
Short	error \| warning
Comments	This allows constraints to be asserted as "shall" (error) and "should" (warning).
Control	1..1
Binding	The codes SHALL be taken from ConstraintSeverity (required to `http://hl7.org/fhir/ValueSet/constraint-severity\|5.0.0`) SHALL applications comply with this constraint?
Type	code
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
248. Extension.extension:constraint.extension:human
Slice Name	human
Definition	DSTU2: `ElementDefinition.constraint.human`
Short	DSTU2: human
Comments	Element `ElementDefinition.constraint.human` is mapped to FHIR R5 element `ElementDefinition.constraint.human` as `Equivalent`. Should be expressed in business terms as much as possible.
Control	1..1
Requirements	Element `ElementDefinition.constraint.human` is mapped to FHIR R5 element `ElementDefinition.constraint.human` as `Equivalent`.
250. Extension.extension:constraint.extension:human.url
Control	1..1
Fixed Value	`human`
252. Extension.extension:constraint.extension:human.value[x]
Definition	Text that can be used to describe the constraint in messages identifying that the constraint has been violated.
Short	Human description of constraint
Comments	Should be expressed in business terms as much as possible.
Control	1..1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
254. Extension.extension:constraint.extension:xpath
Slice Name	xpath
Definition	DSTU2: `ElementDefinition.constraint.xpath` (new:string)
Short	DSTU2: XPath expression of constraint (new)
Comments	Element `ElementDefinition.constraint.xpath` has a context of ElementDefinition.constraint based on following the parent source element upwards and mapping to `ElementDefinition`. Element `ElementDefinition.constraint.xpath` has no mapping targets in FHIR R5. Typically, this is because the element has been added (is a new element). Elements SHALL use "f" as the namespace prefix for the FHIR namespace, and "x" for the xhtml namespace, and SHALL NOT use any other prefixes.
Control	1..1
Requirements	Used in Schematron tests of the validity of the resource. Element `ElementDefinition.constraint.xpath` has a context of ElementDefinition.constraint based on following the parent source element upwards and mapping to `ElementDefinition`. Element `ElementDefinition.constraint.xpath` has no mapping targets in FHIR R5. Typically, this is because the element has been added (is a new element).
256. Extension.extension:constraint.extension:xpath.url
Control	1..1
Fixed Value	`xpath`
258. Extension.extension:constraint.extension:xpath.value[x]
Definition	An XPath expression of constraint that can be executed to see if this constraint is met.
Short	XPath expression of constraint
Comments	Elements SHALL use "f" as the namespace prefix for the FHIR namespace, and "x" for the xhtml namespace, and SHALL NOT use any other prefixes.
Control	1..1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
260. Extension.extension:constraint.url
Control	1..1
Fixed Value	`constraint`
262. Extension.extension:constraint.value[x]
Control	0..0
264. Extension.extension:mustSupport
Slice Name	mustSupport
Definition	DSTU2: `ElementDefinition.mustSupport`
Short	DSTU2: If the element must supported
Comments	Element `ElementDefinition.mustSupport` is mapped to FHIR R5 element `ElementDefinition.mustSupport` as `Equivalent`. "Something useful" is context dependent and impossible to describe in the base FHIR specification. For this reason, tue mustSupport flag is never set to true by the FHIR specification itself - it is only set to true in profiles. This is done in Resource Profiles, where the profile labels an element as mustSupport=true. When a profile does this, it SHALL also make clear exactly what kind of "support" is required, as this can mean many things. Note that an element that has the property IsModifier is not necessarily a "key" element (e.g. one of the important elements to make use of the resource), nor is it automatically mustSupport - however both of these things are more likely to be true for IsModifier elements than for other elements.
Control	0..1
Requirements	Allows a profile to set expectations for system capabilities beyond merely respecting cardinality constraints. Element `ElementDefinition.mustSupport` is mapped to FHIR R5 element `ElementDefinition.mustSupport` as `Equivalent`.
266. Extension.extension:mustSupport.url
Control	1..1
Fixed Value	`mustSupport`
268. Extension.extension:mustSupport.value[x]
Definition	If true, implementations that produce or consume resources SHALL provide "support" for the element in some meaningful way. If false, the element may be ignored and not supported.
Short	If the element must supported
Comments	"Something useful" is context dependent and impossible to describe in the base FHIR specification. For this reason, tue mustSupport flag is never set to true by the FHIR specification itself - it is only set to true in profiles. This is done in Resource Profiles, where the profile labels an element as mustSupport=true. When a profile does this, it SHALL also make clear exactly what kind of "support" is required, as this can mean many things. Note that an element that has the property IsModifier is not necessarily a "key" element (e.g. one of the important elements to make use of the resource), nor is it automatically mustSupport - however both of these things are more likely to be true for IsModifier elements than for other elements.
Control	0..1
Type	boolean
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
270. Extension.extension:isModifier
Slice Name	isModifier
Definition	DSTU2: `ElementDefinition.isModifier`
Short	DSTU2: isModifier
Comments	Element `ElementDefinition.isModifier` is mapped to FHIR R5 element `ElementDefinition.isModifier` as `Equivalent`. Only the definition of an element can set IsModifier true - either the specification itself or where an extension is originally defined. Once set, it cannot be changed in derived profiles. An element/extension that has isModifier=true SHOULD also have a minimum cardinality of 1, so that there is no lack of clarity about what to do if it is missing. If it can be missing, the definition SHALL make the meaning of a missing element clear.
Control	0..1
Requirements	Allows elements to be introduced into a specification that can't safely be ignored by applications that don't recognize them. Element `ElementDefinition.isModifier` is mapped to FHIR R5 element `ElementDefinition.isModifier` as `Equivalent`.
272. Extension.extension:isModifier.url
Control	1..1
Fixed Value	`isModifier`
274. Extension.extension:isModifier.value[x]
Definition	If true, the value of this element affects the interpretation of the element or resource that contains it, and the value of the element cannot be ignored. Typically, this is used for status, negation and qualification codes. The effect of this is that the element cannot be ignored by systems: they SHALL either recognize the element and process it, and/or a pre-determination has been made that it is not relevant to their particular system.
Short	If this modifies the meaning of other elements
Comments	Only the definition of an element can set IsModifier true - either the specification itself or where an extension is originally defined. Once set, it cannot be changed in derived profiles. An element/extension that has isModifier=true SHOULD also have a minimum cardinality of 1, so that there is no lack of clarity about what to do if it is missing. If it can be missing, the definition SHALL make the meaning of a missing element clear.
Control	0..1
Type	boolean
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
276. Extension.extension:isSummary
Slice Name	isSummary
Definition	DSTU2: `ElementDefinition.isSummary`
Short	DSTU2: isSummary
Comments	Element `ElementDefinition.isSummary` is mapped to FHIR R5 element `ElementDefinition.isSummary` as `Equivalent`. Some resources include a set of simple metadata, and some very large data. This element is used to reduce the quantity of data returned in searches. Note that servers may pre-cache summarized resources for optimal performance, so servers may not support per-profile use of the isSummary flag.
Control	0..1
Requirements	Allow clients to search through large resources quickly. Element `ElementDefinition.isSummary` is mapped to FHIR R5 element `ElementDefinition.isSummary` as `Equivalent`.
278. Extension.extension:isSummary.url
Control	1..1
Fixed Value	`isSummary`
280. Extension.extension:isSummary.value[x]
Definition	Whether the element should be included if a client requests a search with the parameter _summary=true.
Short	Include when _summary = true?
Comments	Some resources include a set of simple metadata, and some very large data. This element is used to reduce the quantity of data returned in searches. Note that servers may pre-cache summarized resources for optimal performance, so servers may not support per-profile use of the isSummary flag.
Control	0..1
Type	boolean
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
282. Extension.extension:binding
Slice Name	binding
Definition	DSTU2: `ElementDefinition.binding`
Short	DSTU2: binding
Comments	Element `ElementDefinition.binding` is mapped to FHIR R5 element `ElementDefinition.binding` as `Equivalent`.
Control	0..1
Requirements	Element `ElementDefinition.binding` is mapped to FHIR R5 element `ElementDefinition.binding` as `Equivalent`.
284. Extension.extension:binding.extension
Control	1..*
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
286. Extension.extension:binding.extension:strength
Slice Name	strength
Definition	DSTU2: `ElementDefinition.binding.strength`
Short	DSTU2: strength
Comments	Element `ElementDefinition.binding.strength` is mapped to FHIR R5 element `ElementDefinition.binding.strength` as `Equivalent`. For further discussion, see Using Terminologies.
Control	1..1
Requirements	Element `ElementDefinition.binding.strength` is mapped to FHIR R5 element `ElementDefinition.binding.strength` as `Equivalent`.
288. Extension.extension:binding.extension:strength.url
Control	1..1
Fixed Value	`strength`
290. Extension.extension:binding.extension:strength.value[x]
Definition	Indicates the degree of conformance expectations associated with this binding - that is, the degree to which the provided value set must be adhered to in the instances.
Short	required \| extensible \| preferred \| example
Comments	For further discussion, see Using Terminologies.
Control	1..1
Binding	The codes SHALL be taken from BindingStrength (required to `http://hl7.org/fhir/ValueSet/binding-strength\|5.0.0`) Indication of the degree of conformance expectations associated with a binding.
Type	code
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
292. Extension.extension:binding.extension:description
Slice Name	description
Definition	DSTU2: `ElementDefinition.binding.description`
Short	DSTU2: Human explanation of the value set
Comments	Element `ElementDefinition.binding.description` is mapped to FHIR R5 element `ElementDefinition.binding.description` as `Equivalent`.
Control	0..1
Requirements	Element `ElementDefinition.binding.description` is mapped to FHIR R5 element `ElementDefinition.binding.description` as `Equivalent`.
294. Extension.extension:binding.extension:description.url
Control	1..1
Fixed Value	`description`
296. Extension.extension:binding.extension:description.value[x]
Definition	Describes the intended use of this particular set of codes.
Short	Human explanation of the value set
Control	0..1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
298. Extension.extension:binding.extension:valueSet
Slice Name	valueSet
Definition	DSTU2: `ElementDefinition.binding.valueSet[x]` additional types (Reference(http://hl7.org/fhir/StructureDefinition/ValueSet)) additional types from child elements (display, reference)
Short	DSTU2: Source of value set additional types
Comments	Element `ElementDefinition.binding.valueSet[x]` is mapped to FHIR R5 element `ElementDefinition.binding.valueSet` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.binding.valueSet[x]` do not cover the following types: Reference. The mappings for `ElementDefinition.binding.valueSet[x]` do not cover the following types based on type expansion: display, reference. For value sets with a referenceResource, the display can contain the value set description. The reference may be version-specific or not.
Control	0..1
Requirements	Element `ElementDefinition.binding.valueSet[x]` is mapped to FHIR R5 element `ElementDefinition.binding.valueSet` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.binding.valueSet[x]` do not cover the following types: Reference. The mappings for `ElementDefinition.binding.valueSet[x]` do not cover the following types based on type expansion: display, reference.
300. Extension.extension:binding.extension:valueSet.url
Control	1..1
Fixed Value	`valueSet`
302. Extension.extension:binding.extension:valueSet.value[x]
Definition	Points to the value set or external definition (e.g. implicit value set) that identifies the set of codes to be used.
Short	Source of value set
Comments	For value sets with a referenceResource, the display can contain the value set description. The reference may be version-specific or not.
Control	0..1
Type	Reference(Cross-version Profile for DSTU2.ValueSet for use in FHIR R5, ValueSet)
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
304. Extension.extension:binding.url
Control	1..1
Fixed Value	`binding`
306. Extension.extension:binding.value[x]
Control	0..0
308. Extension.extension:mapping
Slice Name	mapping
Definition	DSTU2: `ElementDefinition.mapping`
Short	DSTU2: mapping
Comments	Element `ElementDefinition.mapping` is mapped to FHIR R5 element `ElementDefinition.mapping` as `Equivalent`. Mappings are not necessarily specific enough for safe translation.
Control	0..*
Requirements	Provides guidance to implementers familiar with or converting content from other specifications. Element `ElementDefinition.mapping` is mapped to FHIR R5 element `ElementDefinition.mapping` as `Equivalent`.
310. Extension.extension:mapping.extension
Control	2..*
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
312. Extension.extension:mapping.extension:identity
Slice Name	identity
Definition	DSTU2: `ElementDefinition.mapping.identity`
Short	DSTU2: identity
Comments	Element `ElementDefinition.mapping.identity` is mapped to FHIR R5 element `ElementDefinition.mapping.identity` as `Equivalent`.
Control	1..1
Requirements	Element `ElementDefinition.mapping.identity` is mapped to FHIR R5 element `ElementDefinition.mapping.identity` as `Equivalent`.
314. Extension.extension:mapping.extension:identity.url
Control	1..1
Fixed Value	`identity`
316. Extension.extension:mapping.extension:identity.value[x]
Definition	An internal reference to the definition of a mapping.
Short	Reference to mapping declaration
Control	1..1
Type	id
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
318. Extension.extension:mapping.extension:language
Slice Name	language
Definition	DSTU2: `ElementDefinition.mapping.language`
Short	DSTU2: language
Comments	Element `ElementDefinition.mapping.language` is mapped to FHIR R5 element `ElementDefinition.mapping.language` as `Equivalent`. If omitted, then there can be no expectation of computational interpretation of the mapping.
Control	0..1
Requirements	Element `ElementDefinition.mapping.language` is mapped to FHIR R5 element `ElementDefinition.mapping.language` as `Equivalent`.
320. Extension.extension:mapping.extension:language.url
Control	1..1
Fixed Value	`language`
322. Extension.extension:mapping.extension:language.value[x]
Definition	Identifies the computable language in which mapping.map is expressed.
Short	Computable language of mapping
Comments	If omitted, then there can be no expectation of computational interpretation of the mapping.
Control	0..1
Type	code
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
324. Extension.extension:mapping.extension:map
Slice Name	map
Definition	DSTU2: `ElementDefinition.mapping.map`
Short	DSTU2: map
Comments	Element `ElementDefinition.mapping.map` is mapped to FHIR R5 element `ElementDefinition.mapping.map` as `Equivalent`. For most mappings, the syntax is undefined. Syntax will be provided for mappings to the RIM. Multiple mappings may be possible and may include constraints on other resource elements that identify when a particular mapping applies.
Control	1..1
Requirements	Element `ElementDefinition.mapping.map` is mapped to FHIR R5 element `ElementDefinition.mapping.map` as `Equivalent`.
326. Extension.extension:mapping.extension:map.url
Control	1..1
Fixed Value	`map`
328. Extension.extension:mapping.extension:map.value[x]
Definition	Expresses what part of the target specification corresponds to this element.
Short	Details of the mapping
Comments	For most mappings, the syntax is undefined. Syntax will be provided for mappings to the RIM. Multiple mappings may be possible and may include constraints on other resource elements that identify when a particular mapping applies.
Control	1..1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
330. Extension.extension:mapping.url
Control	1..1
Fixed Value	`mapping`
332. Extension.extension:mapping.value[x]
Control	0..0
334. Extension.url
Control	1..1
Fixed Value	`http://hl7.org/fhir/1.0/StructureDefinition/extension-StructureDefinition.differential.element`
336. Extension.value[x]
Control	0..0

Guidance on how to interpret the contents of this table can be foundhere

0. Extension
Definition	DSTU2: `StructureDefinition.differential.element` additional types (ElementDefinition) additional types from child elements (alias, base, max, min, path, binding, description, strength, valueSet[x], code, comments, condition, constraint, human, key, requirements, severity, xpath, defaultValue[x], definition, example[x], fixed[x], isModifier, isSummary, label, mapping, identity, language, map, maxLength, maxValue[x], meaningWhenMissing, minValue[x], mustSupport, name, nameReference, pattern[x], representation, short, slicing, discriminator, ordered, rules, type, aggregation, profile)
Short	DSTU2: element additional types
Comments	Element `StructureDefinition.differential.element` is mapped to FHIR R5 element `StructureDefinition.differential.element` as `SourceIsBroaderThanTarget`. The mappings for `StructureDefinition.differential.element` do not cover the following types: ElementDefinition. The mappings for `StructureDefinition.differential.element` do not cover the following types based on type expansion: aggregation, alias, base, binding, code, comments, condition, constraint, defaultValue[x], definition, description, discriminator, example[x], fixed[x], human, identity, isModifier, isSummary, key, label, language, map, mapping, max, maxLength, maxValue[x], meaningWhenMissing, min, minValue[x], mustSupport, name, nameReference, ordered, path, pattern[x], profile, representation, requirements, rules, severity, short, slicing, strength, type, valueSet[x], xpath.
Control	1..*
Is Modifier	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
2. Extension.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
4. Extension.extension
Definition	An Extension
Short	Extension
Control	1..*
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
6. Extension.extension:_datatype
Slice Name	_datatype
Definition	Slice to indicate the presence of a DSTU2 `ElementDefinition` in FHIR R5
Short	DataType slice for a FHIR DSTU2 `ElementDefinition` value
Control	1..1
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
8. Extension.extension:_datatype.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
10. Extension.extension:_datatype.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
12. Extension.extension:_datatype.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`http://hl7.org/fhir/StructureDefinition/_datatype`
14. Extension.extension:_datatype.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Comments	Must be: ElementDefinition
Control	1..1 This element is affected by the following invariants: ext-1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Fixed Value	`ElementDefinition`
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
16. Extension.extension:path
Slice Name	path
Definition	DSTU2: `ElementDefinition.path`
Short	DSTU2: The path of the element (see the Detailed Descriptions)
Comments	Element `ElementDefinition.path` is mapped to FHIR R5 element `ElementDefinition.path` as `Equivalent`.
Control	1..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.path` is mapped to FHIR R5 element `ElementDefinition.path` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
18. Extension.extension:path.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
20. Extension.extension:path.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
22. Extension.extension:path.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`path`
24. Extension.extension:path.value[x]
Definition	The path identifies the element and is expressed as a "."-separated list of ancestor elements, beginning with the name of the resource or extension.
Short	The path of the element (see the Detailed Descriptions)
Control	1..1 This element is affected by the following invariants: ext-1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
26. Extension.extension:representation
Slice Name	representation
Definition	DSTU2: `ElementDefinition.representation` additional codes
Short	DSTU2: How this element is represented in instances additional codes
Comments	Element `ElementDefinition.representation` is mapped to FHIR R5 element `ElementDefinition.representation` as `SourceIsNarrowerThanTarget`. The mappings for `ElementDefinition.representation` do not allow expression of the necessary codes, per the bindings on the source and target. This is rarely used except for special cases where the representation deviates from the normal, which is done only very reluctantly, and can only be done in the base standard (and profiles must reproduce what the base standard does).
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.representation` is mapped to FHIR R5 element `ElementDefinition.representation` as `SourceIsNarrowerThanTarget`. The mappings for `ElementDefinition.representation` do not allow expression of the necessary codes, per the bindings on the source and target.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
28. Extension.extension:representation.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
30. Extension.extension:representation.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
32. Extension.extension:representation.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`representation`
34. Extension.extension:representation.value[x]
Definition	Codes that define how this element is represented in instances, when the deviation varies from the normal case.
Short	How this element is represented in instances
Comments	This is rarely used except for special cases where the representation deviates from the normal, which is done only very reluctantly, and can only be done in the base standard (and profiles must reproduce what the base standard does).
Control	0..1 This element is affected by the following invariants: ext-1
Binding	The codes SHALL be taken from PropertyRepresentation (required to `http://hl7.org/fhir/ValueSet/property-representation\|5.0.0`) How a property is represented on the wire.
Type	code
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
36. Extension.extension:name
Slice Name	name
Definition	DSTU2: `ElementDefinition.name`
Short	DSTU2: Name for this particular element definition (reference target)
Comments	Element `ElementDefinition.name` is mapped to FHIR R5 element `ElementDefinition.sliceName` as `Equivalent`. The name SHALL be unique within the structure within the context of the constrained resource element. (Though to avoid confusion, uniqueness across all elements is recommended.).
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Allows referencing a defined element. May also be used for code generation purposes. Element `ElementDefinition.name` is mapped to FHIR R5 element `ElementDefinition.sliceName` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
38. Extension.extension:name.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
40. Extension.extension:name.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
42. Extension.extension:name.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`name`
44. Extension.extension:name.value[x]
Definition	The name of this element definition (to refer to it from other element definitions using ElementDefinition.nameReference). This is a unique name referring to a specific set of constraints applied to this element. One use of this is to provide a name to different slices of the same element.
Short	Name for this particular element definition (reference target)
Comments	The name SHALL be unique within the structure within the context of the constrained resource element. (Though to avoid confusion, uniqueness across all elements is recommended.).
Control	0..1 This element is affected by the following invariants: ext-1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
46. Extension.extension:label
Slice Name	label
Definition	DSTU2: `ElementDefinition.label`
Short	DSTU2: label
Comments	Element `ElementDefinition.label` is mapped to FHIR R5 element `ElementDefinition.label` as `Equivalent`. Question and label serve similar purposes in they both can be used to prompt for capturing a data element. Whether the question form or label form should be used will depend on the type of instrument being used to capture the information.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.label` is mapped to FHIR R5 element `ElementDefinition.label` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
48. Extension.extension:label.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
50. Extension.extension:label.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
52. Extension.extension:label.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`label`
54. Extension.extension:label.value[x]
Definition	The text to display beside the element indicating its meaning or to use to prompt for the element in a user display or form.
Short	Name for element to display with or prompt for element
Comments	Question and label serve similar purposes in they both can be used to prompt for capturing a data element. Whether the question form or label form should be used will depend on the type of instrument being used to capture the information.
Control	0..1 This element is affected by the following invariants: ext-1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
56. Extension.extension:code
Slice Name	code
Definition	DSTU2: `ElementDefinition.code`
Short	DSTU2: Defining code
Comments	Element `ElementDefinition.code` is mapped to FHIR R5 element `ElementDefinition.code` as `Equivalent`. The data element definition and other constraints SHALL be a proper constraint on the meaning (as defined in the code system, including relationships) of any code listed here. Where multiple codes exist in a terminology that could correspond to the data element, the most granular code(s) should be selected, so long as they are not more restrictive than the data element itself.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Links the meaning of an element to an external terminology. Element `ElementDefinition.code` is mapped to FHIR R5 element `ElementDefinition.code` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
58. Extension.extension:code.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
60. Extension.extension:code.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
62. Extension.extension:code.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`code`
64. Extension.extension:code.value[x]
Definition	A code that provides the meaning for the element according to a particular terminology.
Short	Defining code
Comments	The data element definition and other constraints SHALL be a proper constraint on the meaning (as defined in the code system, including relationships) of any code listed here. Where multiple codes exist in a terminology that could correspond to the data element, the most granular code(s) should be selected, so long as they are not more restrictive than the data element itself.
Control	0..1 This element is affected by the following invariants: ext-1
Type	Coding
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
66. Extension.extension:slicing
Slice Name	slicing
Definition	DSTU2: `ElementDefinition.slicing`
Short	DSTU2: slicing
Comments	Element `ElementDefinition.slicing` is mapped to FHIR R5 element `ElementDefinition.slicing` as `Equivalent`. The first element in the sequence, the one that carries the slicing, is the unconstrained element, for reference purposes . This may include the unconstrained children.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.slicing` is mapped to FHIR R5 element `ElementDefinition.slicing` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
68. Extension.extension:slicing.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
70. Extension.extension:slicing.extension
Definition	An Extension
Short	Extension
Control	1..*
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
72. Extension.extension:slicing.extension:discriminator
Slice Name	discriminator
Definition	DSTU2: `ElementDefinition.slicing.discriminator`
Short	DSTU2: Element values that used to distinguish the slices
Comments	Element `ElementDefinition.slicing.discriminator` is mapped to FHIR R5 element `ElementDefinition.slicing.discriminator` as `Equivalent`. If there is no discriminator, the content is hard to process, so this should be avoided. If the base element has a cardinality of ..1, and there is a choice of types, the discriminator most be "@type".
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.slicing.discriminator` is mapped to FHIR R5 element `ElementDefinition.slicing.discriminator` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
74. Extension.extension:slicing.extension:discriminator.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
76. Extension.extension:slicing.extension:discriminator.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
78. Extension.extension:slicing.extension:discriminator.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`discriminator`
80. Extension.extension:slicing.extension:discriminator.value[x]
Definition	Designates which child elements are used to discriminate between the slices when processing an instance. If one or more discriminators are provided, the value of the child elements in the instance data SHALL completely distinguish which slice the element in the resource matches based on the allowed values for those elements in each of the slices.
Short	Element values that used to distinguish the slices
Comments	If there is no discriminator, the content is hard to process, so this should be avoided. If the base element has a cardinality of ..1, and there is a choice of types, the discriminator most be "@type".
Control	0..1 This element is affected by the following invariants: ext-1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
82. Extension.extension:slicing.extension:description
Slice Name	description
Definition	DSTU2: `ElementDefinition.slicing.description`
Short	DSTU2: description
Comments	Element `ElementDefinition.slicing.description` is mapped to FHIR R5 element `ElementDefinition.slicing.description` as `Equivalent`. If it's really not possible to differentiate them, the design should be re-evaluated to make the content usable.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.slicing.description` is mapped to FHIR R5 element `ElementDefinition.slicing.description` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
84. Extension.extension:slicing.extension:description.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
86. Extension.extension:slicing.extension:description.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
88. Extension.extension:slicing.extension:description.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`description`
90. Extension.extension:slicing.extension:description.value[x]
Definition	A human-readable text description of how the slicing works. If there is no discriminator, this is required to be present to provide whatever information is possible about how the slices can be differentiated.
Short	Text description of how slicing works (or not)
Comments	If it's really not possible to differentiate them, the design should be re-evaluated to make the content usable.
Control	0..1 This element is affected by the following invariants: ext-1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
92. Extension.extension:slicing.extension:ordered
Slice Name	ordered
Definition	DSTU2: `ElementDefinition.slicing.ordered`
Short	DSTU2: ordered
Comments	Element `ElementDefinition.slicing.ordered` is mapped to FHIR R5 element `ElementDefinition.slicing.ordered` as `Equivalent`. Order should only be required when it is a pressing concern for presentation. Profile authors should consider making the order a feature of the rules about the narrative, not the rules about the data - requiring ordered data makes the profile much less re-usable.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.slicing.ordered` is mapped to FHIR R5 element `ElementDefinition.slicing.ordered` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
94. Extension.extension:slicing.extension:ordered.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
96. Extension.extension:slicing.extension:ordered.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
98. Extension.extension:slicing.extension:ordered.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`ordered`
100. Extension.extension:slicing.extension:ordered.value[x]
Definition	If the matching elements have to occur in the same order as defined in the profile.
Short	If elements must be in same order as slices
Comments	Order should only be required when it is a pressing concern for presentation. Profile authors should consider making the order a feature of the rules about the narrative, not the rules about the data - requiring ordered data makes the profile much less re-usable.
Control	0..1 This element is affected by the following invariants: ext-1
Type	boolean
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
102. Extension.extension:slicing.extension:rules
Slice Name	rules
Definition	DSTU2: `ElementDefinition.slicing.rules`
Short	DSTU2: rules
Comments	Element `ElementDefinition.slicing.rules` is mapped to FHIR R5 element `ElementDefinition.slicing.rules` as `Equivalent`. Allowing additional elements makes for a much for flexible template - it's open for use in wider contexts, but also means that the content of the resource is not closed, and applications have to decide how to handle content not described by the profile.
Control	1..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.slicing.rules` is mapped to FHIR R5 element `ElementDefinition.slicing.rules` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
104. Extension.extension:slicing.extension:rules.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
106. Extension.extension:slicing.extension:rules.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
108. Extension.extension:slicing.extension:rules.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`rules`
110. Extension.extension:slicing.extension:rules.value[x]
Definition	Whether additional slices are allowed or not. When the slices are ordered, profile authors can also say that additional slices are only allowed at the end.
Short	closed \| open \| openAtEnd
Comments	Allowing additional elements makes for a much for flexible template - it's open for use in wider contexts, but also means that the content of the resource is not closed, and applications have to decide how to handle content not described by the profile.
Control	1..1 This element is affected by the following invariants: ext-1
Binding	The codes SHALL be taken from SlicingRules (required to `http://hl7.org/fhir/ValueSet/resource-slicing-rules\|5.0.0`) How slices are interpreted when evaluating an instance.
Type	code
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
112. Extension.extension:slicing.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`slicing`
114. Extension.extension:slicing.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	0..0 This element is affected by the following invariants: ext-1
Type	Choice of: base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, integer64, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, CodeableReference, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, RatioRange, Reference, SampledData, Signature, Timing, ContactDetail, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Availability, ExtendedContactDetail, Dosage, Meta
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
116. Extension.extension:short
Slice Name	short
Definition	DSTU2: `ElementDefinition.short`
Short	DSTU2: Concise definition for xml presentation
Comments	Element `ElementDefinition.short` is mapped to FHIR R5 element `ElementDefinition.short` as `Equivalent`. May change the term to provide language more appropriate to the context of the profile or to reflect slicing.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.short` is mapped to FHIR R5 element `ElementDefinition.short` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
118. Extension.extension:short.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
120. Extension.extension:short.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
122. Extension.extension:short.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`short`
124. Extension.extension:short.value[x]
Definition	A concise description of what this element means (e.g. for use in autogenerated summaries).
Short	Concise definition for xml presentation
Comments	May change the term to provide language more appropriate to the context of the profile or to reflect slicing.
Control	0..1 This element is affected by the following invariants: ext-1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
126. Extension.extension:definition
Slice Name	definition
Definition	DSTU2: `ElementDefinition.definition`
Short	DSTU2: definition
Comments	Element `ElementDefinition.definition` is mapped to FHIR R5 element `ElementDefinition.definition` as `Equivalent`. It is easy for a different definition to change the meaning of an element and this can have nasty downstream consequences. Please be careful when providing definitions.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	To allow a user to state the usage of an element in a particular context. Element `ElementDefinition.definition` is mapped to FHIR R5 element `ElementDefinition.definition` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
128. Extension.extension:definition.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
130. Extension.extension:definition.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
132. Extension.extension:definition.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`definition`
134. Extension.extension:definition.value[x]
Definition	Provides a complete explanation of the meaning of the data element for human readability. For the case of elements derived from existing elements (e.g. constraints), the definition SHALL be consistent with the base definition, but convey the meaning of the element in the particular context of use of the resource.
Short	Full formal definition as narrative text
Comments	It is easy for a different definition to change the meaning of an element and this can have nasty downstream consequences. Please be careful when providing definitions.
Control	0..1 This element is affected by the following invariants: ext-1
Type	markdown
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
136. Extension.extension:comments
Slice Name	comments
Definition	DSTU2: `ElementDefinition.comments`
Short	DSTU2: comments
Comments	Element `ElementDefinition.comments` is mapped to FHIR R5 element `ElementDefinition.comment` as `Equivalent`. If it is possible to capture usage rules using constraints, that mechanism should be used in preference to this element.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.comments` is mapped to FHIR R5 element `ElementDefinition.comment` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
138. Extension.extension:comments.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
140. Extension.extension:comments.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
142. Extension.extension:comments.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`comments`
144. Extension.extension:comments.value[x]
Definition	Explanatory notes and implementation guidance about the data element, including notes about how to use the data properly, exceptions to proper use, etc.
Short	Comments about the use of this element
Comments	If it is possible to capture usage rules using constraints, that mechanism should be used in preference to this element.
Control	0..1 This element is affected by the following invariants: ext-1
Type	markdown
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
146. Extension.extension:requirements
Slice Name	requirements
Definition	DSTU2: `ElementDefinition.requirements`
Short	DSTU2: Why is this needed?
Comments	Element `ElementDefinition.requirements` is mapped to FHIR R5 element `ElementDefinition.requirements` as `Equivalent`. This element does not describe the usage of the element (that's done in comments), rather it's for traceability of why the element is either needed or why the constraints exist as they do. This may be used to point to source materials or specifications that drove the structure of this data element.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.requirements` is mapped to FHIR R5 element `ElementDefinition.requirements` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
148. Extension.extension:requirements.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
150. Extension.extension:requirements.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
152. Extension.extension:requirements.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`requirements`
154. Extension.extension:requirements.value[x]
Definition	This element is for traceability of why the element was created and why the constraints exist as they do. This may be used to point to source materials or specifications that drove the structure of this element.
Short	Why is this needed?
Comments	This element does not describe the usage of the element (that's done in comments), rather it's for traceability of why the element is either needed or why the constraints exist as they do. This may be used to point to source materials or specifications that drove the structure of this data element.
Control	0..1 This element is affected by the following invariants: ext-1
Type	markdown
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
156. Extension.extension:alias
Slice Name	alias
Definition	DSTU2: `ElementDefinition.alias`
Short	DSTU2: alias
Comments	Element `ElementDefinition.alias` is mapped to FHIR R5 element `ElementDefinition.alias` as `Equivalent`.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Allows for better easier recognition of the element by multiple communities, including international communities. Element `ElementDefinition.alias` is mapped to FHIR R5 element `ElementDefinition.alias` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
158. Extension.extension:alias.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
160. Extension.extension:alias.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
162. Extension.extension:alias.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`alias`
164. Extension.extension:alias.value[x]
Definition	Identifies additional names by which this element might also be known.
Short	Other names
Control	0..1 This element is affected by the following invariants: ext-1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
166. Extension.extension:min
Slice Name	min
Definition	DSTU2: `ElementDefinition.min` additional types (integer) additional types from child elements (value)
Short	DSTU2: min additional types
Comments	Element `ElementDefinition.min` is mapped to FHIR R5 element `ElementDefinition.min` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.min` do not cover the following types: integer. The mappings for `ElementDefinition.min` do not cover the following types based on type expansion: value.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.min` is mapped to FHIR R5 element `ElementDefinition.min` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.min` do not cover the following types: integer. The mappings for `ElementDefinition.min` do not cover the following types based on type expansion: value.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
168. Extension.extension:min.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
170. Extension.extension:min.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
172. Extension.extension:min.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`min`
174. Extension.extension:min.value[x]
Definition	The minimum number of times this element SHALL appear in the instance.
Short	Minimum Cardinality
Control	0..1 This element is affected by the following invariants: ext-1
Type	integer
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
176. Extension.extension:max
Slice Name	max
Definition	DSTU2: `ElementDefinition.max`
Short	DSTU2: max
Comments	Element `ElementDefinition.max` is mapped to FHIR R5 element `ElementDefinition.max` as `Equivalent`.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.max` is mapped to FHIR R5 element `ElementDefinition.max` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
178. Extension.extension:max.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
180. Extension.extension:max.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
182. Extension.extension:max.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`max`
184. Extension.extension:max.value[x]
Definition	The maximum number of times this element is permitted to appear in the instance.
Short	Maximum Cardinality (a number or *)
Control	0..1 This element is affected by the following invariants: ext-1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
186. Extension.extension:base
Slice Name	base
Definition	DSTU2: `ElementDefinition.base`
Short	DSTU2: base
Comments	Element `ElementDefinition.base` is mapped to FHIR R5 element `ElementDefinition.base` as `Equivalent`. The base information does not carry any information that could not be determined from the path and related profiles, but making this determination requires both that the related profiles are available, and that the algorithm to determine them be available. So they are deformalised into this location for tooling convenience, and to ensure that the base information is available without dependencies.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.base` is mapped to FHIR R5 element `ElementDefinition.base` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
188. Extension.extension:base.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
190. Extension.extension:base.extension
Definition	An Extension
Short	Extension
Control	3..*
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
192. Extension.extension:base.extension:path
Slice Name	path
Definition	DSTU2: `ElementDefinition.base.path`
Short	DSTU2: path
Comments	Element `ElementDefinition.base.path` is mapped to FHIR R5 element `ElementDefinition.base.path` as `Equivalent`.
Control	1..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.base.path` is mapped to FHIR R5 element `ElementDefinition.base.path` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
194. Extension.extension:base.extension:path.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
196. Extension.extension:base.extension:path.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
198. Extension.extension:base.extension:path.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`path`
200. Extension.extension:base.extension:path.value[x]
Definition	The Path that identifies the base element - this matches the ElementDefinition.path for that element. Across FHIR, there is only one base definition of any element - that is, an element definition on a StructureDefinition without a StructureDefinition.base.
Short	Path that identifies the base element
Control	1..1 This element is affected by the following invariants: ext-1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
202. Extension.extension:base.extension:min
Slice Name	min
Definition	DSTU2: `ElementDefinition.base.min` additional types (integer) additional types from child elements (value)
Short	DSTU2: min additional types
Comments	Element `ElementDefinition.base.min` is mapped to FHIR R5 element `ElementDefinition.base.min` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.base.min` do not cover the following types: integer. The mappings for `ElementDefinition.base.min` do not cover the following types based on type expansion: value. This is provided for consistency with max, and may affect code generation of mandatory elements of the base resource are generated differently (some reference implementations have done this).
Control	1..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.base.min` is mapped to FHIR R5 element `ElementDefinition.base.min` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.base.min` do not cover the following types: integer. The mappings for `ElementDefinition.base.min` do not cover the following types based on type expansion: value.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
204. Extension.extension:base.extension:min.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
206. Extension.extension:base.extension:min.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
208. Extension.extension:base.extension:min.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`min`
210. Extension.extension:base.extension:min.value[x]
Definition	Minimum cardinality of the base element identified by the path.
Short	Min cardinality of the base element
Comments	This is provided for consistency with max, and may affect code generation of mandatory elements of the base resource are generated differently (some reference implementations have done this).
Control	1..1 This element is affected by the following invariants: ext-1
Type	integer
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
212. Extension.extension:base.extension:max
Slice Name	max
Definition	DSTU2: `ElementDefinition.base.max`
Short	DSTU2: max
Comments	Element `ElementDefinition.base.max` is mapped to FHIR R5 element `ElementDefinition.base.max` as `Equivalent`. This is provided to code generation, since the wire representation in JSON differs depending on whether the base element has max > 1. Also, some forms of code generation may differ.
Control	1..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.base.max` is mapped to FHIR R5 element `ElementDefinition.base.max` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
214. Extension.extension:base.extension:max.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
216. Extension.extension:base.extension:max.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
218. Extension.extension:base.extension:max.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`max`
220. Extension.extension:base.extension:max.value[x]
Definition	Maximum cardinality of the base element identified by the path.
Short	Max cardinality of the base element
Comments	This is provided to code generation, since the wire representation in JSON differs depending on whether the base element has max > 1. Also, some forms of code generation may differ.
Control	1..1 This element is affected by the following invariants: ext-1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
222. Extension.extension:base.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`base`
224. Extension.extension:base.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	0..0 This element is affected by the following invariants: ext-1
Type	Choice of: base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, integer64, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, CodeableReference, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, RatioRange, Reference, SampledData, Signature, Timing, ContactDetail, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Availability, ExtendedContactDetail, Dosage, Meta
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
226. Extension.extension:type
Slice Name	type
Definition	DSTU2: `ElementDefinition.type`
Short	DSTU2: type
Comments	Element `ElementDefinition.type` is mapped to FHIR R5 element `ElementDefinition.type` as `Equivalent`. The Type of the element can be left blank, in which case the type is inherited from the resource. The type can only be listed in this field if it is an allowed option in the base resource.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.type` is mapped to FHIR R5 element `ElementDefinition.type` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
228. Extension.extension:type.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
230. Extension.extension:type.extension
Definition	An Extension
Short	Extension
Control	1..*
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
232. Extension.extension:type.extension:code
Slice Name	code
Definition	DSTU2: `ElementDefinition.type.code` additional types (code) additional types from child elements (value)
Short	DSTU2: Name of Data type or Resource additional types
Comments	Element `ElementDefinition.type.code` is mapped to FHIR R5 element `ElementDefinition.type.code` as `RelatedTo`. The mappings for `ElementDefinition.type.code` do not cover the following types: code. The mappings for `ElementDefinition.type.code` do not cover the following types based on type expansion: value. If the element is a reference to another resource, this element contains "Reference", and the profile element refers to the profile of the allowed target of the resource, which may be a reference to the general definition of a resource (e.g. http://hl7.org/fhir/StructureDefinition/Patient). There would be one pair of type/code for each allowed target resource type.
Control	1..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.type.code` is mapped to FHIR R5 element `ElementDefinition.type.code` as `RelatedTo`. The mappings for `ElementDefinition.type.code` do not cover the following types: code. The mappings for `ElementDefinition.type.code` do not cover the following types based on type expansion: value.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
234. Extension.extension:type.extension:code.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
236. Extension.extension:type.extension:code.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
238. Extension.extension:type.extension:code.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`code`
240. Extension.extension:type.extension:code.value[x]
Definition	Name of Data type or Resource that is a(or the) type used for this element.
Short	Name of Data type or Resource
Comments	If the element is a reference to another resource, this element contains "Reference", and the profile element refers to the profile of the allowed target of the resource, which may be a reference to the general definition of a resource (e.g. http://hl7.org/fhir/StructureDefinition/Patient). There would be one pair of type/code for each allowed target resource type.
Control	1..1 This element is affected by the following invariants: ext-1
Binding	The codes SHALL be taken from R2DefinedTypesForR5 (0.1.0) (required to `http://hl7.org/fhir/uv/xver/ValueSet/R2-defined-types-for-R5\|0.1.0`) Either a resource or a data type.
Type	code
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
242. Extension.extension:type.extension:profile
Slice Name	profile
Definition	DSTU2: `ElementDefinition.type.profile`
Short	DSTU2: Profile (StructureDefinition) to apply (or IG)
Comments	Element `ElementDefinition.type.profile` is mapped to FHIR R5 element `ElementDefinition.type.profile` as `RelatedTo`.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.type.profile` is mapped to FHIR R5 element `ElementDefinition.type.profile` as `RelatedTo`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
244. Extension.extension:type.extension:profile.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
246. Extension.extension:type.extension:profile.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
248. Extension.extension:type.extension:profile.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`profile`
250. Extension.extension:type.extension:profile.value[x]
Definition	Identifies a profile structure or implementation Guide that SHALL hold for resources or datatypes referenced as the type of this element. Can be a local reference - to another structure in this profile, or a reference to a structure in another profile. When more than one profile is specified, the content must conform to all of them. When an implementation guide is specified, the resource SHALL conform to at least one profile defined in the implementation guide.
Short	Profile (StructureDefinition) to apply (or IG)
Control	0..1 This element is affected by the following invariants: ext-1
Type	uri
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
252. Extension.extension:type.extension:aggregation
Slice Name	aggregation
Definition	DSTU2: `ElementDefinition.type.aggregation`
Short	DSTU2: aggregation
Comments	Element `ElementDefinition.type.aggregation` is mapped to FHIR R5 element `ElementDefinition.type.aggregation` as `Equivalent`.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.type.aggregation` is mapped to FHIR R5 element `ElementDefinition.type.aggregation` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
254. Extension.extension:type.extension:aggregation.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
256. Extension.extension:type.extension:aggregation.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
258. Extension.extension:type.extension:aggregation.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`aggregation`
260. Extension.extension:type.extension:aggregation.value[x]
Definition	If the type is a reference to another resource, how the resource is or can be aggregated - is it a contained resource, or a reference, and if the context is a bundle, is it included in the bundle.
Short	contained \| referenced \| bundled - how aggregated
Control	0..1 This element is affected by the following invariants: ext-1
Binding	The codes SHALL be taken from AggregationMode (required to `http://hl7.org/fhir/ValueSet/resource-aggregation-mode\|5.0.0`) How resource references can be aggregated.
Type	code
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
262. Extension.extension:type.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`type`
264. Extension.extension:type.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	0..0 This element is affected by the following invariants: ext-1
Type	Choice of: base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, integer64, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, CodeableReference, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, RatioRange, Reference, SampledData, Signature, Timing, ContactDetail, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Availability, ExtendedContactDetail, Dosage, Meta
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
266. Extension.extension:nameReference
Slice Name	nameReference
Definition	DSTU2: `ElementDefinition.nameReference` additional types (string) additional types from child elements (value)
Short	DSTU2: To another element constraint (by element.name) additional types
Comments	Element `ElementDefinition.nameReference` is mapped to FHIR R5 element `ElementDefinition.contentReference` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.nameReference` do not cover the following types: string. The mappings for `ElementDefinition.nameReference` do not cover the following types based on type expansion: value. If child components of this element are defined, they act as constraints on the referenced slice.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.nameReference` is mapped to FHIR R5 element `ElementDefinition.contentReference` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.nameReference` do not cover the following types: string. The mappings for `ElementDefinition.nameReference` do not cover the following types based on type expansion: value.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
268. Extension.extension:nameReference.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
270. Extension.extension:nameReference.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
272. Extension.extension:nameReference.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`nameReference`
274. Extension.extension:nameReference.value[x]
Definition	Identifies the name of a slice defined elsewhere in the profile whose constraints should be applied to the current element.
Short	To another element constraint (by element.name)
Comments	If child components of this element are defined, they act as constraints on the referenced slice.
Control	0..1 This element is affected by the following invariants: ext-1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
276. Extension.extension:defaultValue
Slice Name	defaultValue
Definition	DSTU2: `ElementDefinition.defaultValue[x]` additional types (Annotation, Attachment, Identifier, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Meta)
Short	DSTU2: Specified value it missing from instance additional types
Comments	Element `ElementDefinition.defaultValue[x]` is mapped to FHIR R5 element `ElementDefinition.defaultValue[x]` as `RelatedTo`. The mappings for `ElementDefinition.defaultValue[x]` do not cover the following types: Address, Annotation, Attachment, ContactPoint, HumanName, Identifier, Meta, Period, Range, Ratio, SampledData, Signature, Timing. The target context `ElementDefinition.defaultValue[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`. Default values can only be specified on a resource, data type, or extension definition, and never in a profile that applies to one of these. Specifying a default value means that the property can never been unknown - it must always have a value. Further, the default value can never be changed. For these reasons, default values are (and should be) used extremely sparingly.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.defaultValue[x]` is mapped to FHIR R5 element `ElementDefinition.defaultValue[x]` as `RelatedTo`. The mappings for `ElementDefinition.defaultValue[x]` do not cover the following types: Address, Annotation, Attachment, ContactPoint, HumanName, Identifier, Meta, Period, Range, Ratio, SampledData, Signature, Timing. The target context `ElementDefinition.defaultValue[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
278. Extension.extension:defaultValue.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
280. Extension.extension:defaultValue.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
282. Extension.extension:defaultValue.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`defaultValue`
284. Extension.extension:defaultValue.value[x]
Definition	The value that should be used if there is no value stated in the instance (e.g. 'if not otherwise specified, the abstract is false').
Short	Specified value it missing from instance
Comments	Default values can only be specified on a resource, data type, or extension definition, and never in a profile that applies to one of these. Specifying a default value means that the property can never been unknown - it must always have a value. Further, the default value can never be changed. For these reasons, default values are (and should be) used extremely sparingly.
Control	0..1 This element is affected by the following invariants: ext-1
Type	Choice of: Annotation, Attachment, Identifier, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Meta
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
286. Extension.extension:meaningWhenMissing
Slice Name	meaningWhenMissing
Definition	DSTU2: `ElementDefinition.meaningWhenMissing`
Short	DSTU2: meaningWhenMissing
Comments	Element `ElementDefinition.meaningWhenMissing` is mapped to FHIR R5 element `ElementDefinition.meaningWhenMissing` as `Equivalent`. Implicit meanings for missing values can only be specified on a resource, data type, or extension definition, and never in a profile that applies to one of these. An implicit meaning for a missing value can never be changed, and specifying one has the consequence that constraining its use in profiles eliminates use cases as possibilities, not merely moving them out of scope.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.meaningWhenMissing` is mapped to FHIR R5 element `ElementDefinition.meaningWhenMissing` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
288. Extension.extension:meaningWhenMissing.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
290. Extension.extension:meaningWhenMissing.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
292. Extension.extension:meaningWhenMissing.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`meaningWhenMissing`
294. Extension.extension:meaningWhenMissing.value[x]
Definition	The Implicit meaning that is to be understood when this element is missing (e.g. 'when this element is missing, the period is ongoing'.
Short	Implicit meaning when this element is missing
Comments	Implicit meanings for missing values can only be specified on a resource, data type, or extension definition, and never in a profile that applies to one of these. An implicit meaning for a missing value can never be changed, and specifying one has the consequence that constraining its use in profiles eliminates use cases as possibilities, not merely moving them out of scope.
Control	0..1 This element is affected by the following invariants: ext-1
Type	markdown
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
296. Extension.extension:fixed
Slice Name	fixed
Definition	DSTU2: `ElementDefinition.fixed[x]` additional types (Annotation, Attachment, Identifier, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Meta)
Short	DSTU2: fixed additional types
Comments	Element `ElementDefinition.fixed[x]` is mapped to FHIR R5 element `ElementDefinition.fixed[x]` as `RelatedTo`. The mappings for `ElementDefinition.fixed[x]` do not cover the following types: Address, Annotation, Attachment, ContactPoint, HumanName, Identifier, Meta, Period, Range, Ratio, SampledData, Signature, Timing. The target context `ElementDefinition.fixed[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`. This is not recommended for Coding and CodeableConcept since these often have highly contextual properties such as version or display.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.fixed[x]` is mapped to FHIR R5 element `ElementDefinition.fixed[x]` as `RelatedTo`. The mappings for `ElementDefinition.fixed[x]` do not cover the following types: Address, Annotation, Attachment, ContactPoint, HumanName, Identifier, Meta, Period, Range, Ratio, SampledData, Signature, Timing. The target context `ElementDefinition.fixed[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
298. Extension.extension:fixed.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
300. Extension.extension:fixed.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
302. Extension.extension:fixed.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`fixed`
304. Extension.extension:fixed.value[x]
Definition	Specifies a value that SHALL be exactly the value for this element in the instance. For purposes of comparison, non-significant whitespace is ignored, and all values must be an exact match (case and accent sensitive). Missing elements/attributes must also be missing.
Short	Value must be exactly this
Comments	This is not recommended for Coding and CodeableConcept since these often have highly contextual properties such as version or display.
Control	0..1 This element is affected by the following invariants: ext-1
Type	Choice of: Annotation, Attachment, Identifier, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Meta
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
306. Extension.extension:pattern
Slice Name	pattern
Definition	DSTU2: `ElementDefinition.pattern[x]` additional types (Annotation, Attachment, Identifier, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Meta)
Short	DSTU2: pattern additional types
Comments	Element `ElementDefinition.pattern[x]` is mapped to FHIR R5 element `ElementDefinition.pattern[x]` as `RelatedTo`. The mappings for `ElementDefinition.pattern[x]` do not cover the following types: Address, Annotation, Attachment, ContactPoint, HumanName, Identifier, Meta, Period, Range, Ratio, SampledData, Signature, Timing. The target context `ElementDefinition.pattern[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`. Mostly used for fixing values of CodeableConcept. At present, pattern[x] is not recommended as a basis for slicing while issues related to this are investigated during the DSTU period.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.pattern[x]` is mapped to FHIR R5 element `ElementDefinition.pattern[x]` as `RelatedTo`. The mappings for `ElementDefinition.pattern[x]` do not cover the following types: Address, Annotation, Attachment, ContactPoint, HumanName, Identifier, Meta, Period, Range, Ratio, SampledData, Signature, Timing. The target context `ElementDefinition.pattern[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
308. Extension.extension:pattern.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
310. Extension.extension:pattern.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
312. Extension.extension:pattern.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`pattern`
314. Extension.extension:pattern.value[x]
Definition	Specifies a value that the value in the instance SHALL follow - that is, any value in the pattern must be found in the instance. Other additional values may be found too. This is effectively constraint by example. The values of elements present in the pattern must match exactly (case-sensitive, accent-sensitive, etc.).
Short	Value must have at least these property values
Comments	Mostly used for fixing values of CodeableConcept. At present, pattern[x] is not recommended as a basis for slicing while issues related to this are investigated during the DSTU period.
Control	0..1 This element is affected by the following invariants: ext-1
Type	Choice of: Annotation, Attachment, Identifier, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Meta
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
316. Extension.extension:example
Slice Name	example
Definition	DSTU2: `ElementDefinition.example[x]`
Short	DSTU2: Example value: [as defined for type]
Comments	Element `ElementDefinition.example[x]` is mapped to FHIR R5 element `ElementDefinition.example` as `SourceIsNarrowerThanTarget`. This will most commonly be present for data where it's not implicitly obvious from either the data type or value set what the values might be. (I.e. Example values for dates or quantities would generally be unnecessary.) If the example value is fully populated, the publication tool can generate an instance automatically.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.example[x]` is mapped to FHIR R5 element `ElementDefinition.example` as `SourceIsNarrowerThanTarget`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
318. Extension.extension:example.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
320. Extension.extension:example.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
322. Extension.extension:example.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`example`
324. Extension.extension:example.value[x]
Definition	A sample value for this element demonstrating the type of information that would typically be captured.
Short	Example value: [as defined for type]
Comments	This will most commonly be present for data where it's not implicitly obvious from either the data type or value set what the values might be. (I.e. Example values for dates or quantities would generally be unnecessary.) If the example value is fully populated, the publication tool can generate an instance automatically.
Control	0..1 This element is affected by the following invariants: ext-1
Type	Choice of: boolean, integer, decimal, base64Binary, instant, string, uri, date, dateTime, time, code, oid, id, unsignedInt, positiveInt, markdown, Annotation, Attachment, Identifier, CodeableConcept, Coding, Quantity, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Reference, Meta
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
326. Extension.extension:minValue
Slice Name	minValue
Definition	DSTU2: `ElementDefinition.minValue[x]` additional types (boolean, base64Binary, string, uri, code, oid, id, markdown, Annotation, Attachment, Identifier, CodeableConcept, Coding, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Reference, Meta)
Short	DSTU2: minValue additional types
Comments	Element `ElementDefinition.minValue[x]` is mapped to FHIR R5 element `ElementDefinition.minValue[x]` as `RelatedTo`. The mappings for `ElementDefinition.minValue[x]` do not cover the following types: Address, Annotation, Attachment, base64Binary, boolean, code, CodeableConcept, Coding, ContactPoint, HumanName, id, Identifier, markdown, Meta, oid, Period, Range, Ratio, Reference, SampledData, Signature, string, Timing, uri. The target context `ElementDefinition.minValue[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`. Except for date/date/instant, the type of the minValue[x] SHALL be the same as the specified type of the element. For the date/dateTime/instant values, the type of minValue[x] SHALL be either the same, or a a Duration which specifies a relative time limit to the current time. The duration value is positive, and is subtracted from the current clock to determine the minimum allowable value. A minimum value for a Quantity is interpreted as an canonical minimum - e.g. you cannot provide 100mg if the minimum value is 10g.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.minValue[x]` is mapped to FHIR R5 element `ElementDefinition.minValue[x]` as `RelatedTo`. The mappings for `ElementDefinition.minValue[x]` do not cover the following types: Address, Annotation, Attachment, base64Binary, boolean, code, CodeableConcept, Coding, ContactPoint, HumanName, id, Identifier, markdown, Meta, oid, Period, Range, Ratio, Reference, SampledData, Signature, string, Timing, uri. The target context `ElementDefinition.minValue[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
328. Extension.extension:minValue.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
330. Extension.extension:minValue.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
332. Extension.extension:minValue.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`minValue`
334. Extension.extension:minValue.value[x]
Definition	The minimum allowed value for the element. The value is inclusive. This is allowed for the types date, dateTime, instant, time, decimal, integer, and Quantity.
Short	Minimum Allowed Value (for some types)
Comments	Except for date/date/instant, the type of the minValue[x] SHALL be the same as the specified type of the element. For the date/dateTime/instant values, the type of minValue[x] SHALL be either the same, or a a Duration which specifies a relative time limit to the current time. The duration value is positive, and is subtracted from the current clock to determine the minimum allowable value. A minimum value for a Quantity is interpreted as an canonical minimum - e.g. you cannot provide 100mg if the minimum value is 10g.
Control	0..1 This element is affected by the following invariants: ext-1
Type	Choice of: boolean, base64Binary, string, uri, code, oid, id, markdown, Annotation, Attachment, Identifier, CodeableConcept, Coding, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Reference, Meta
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
336. Extension.extension:maxValue
Slice Name	maxValue
Definition	DSTU2: `ElementDefinition.maxValue[x]` additional types (boolean, base64Binary, string, uri, code, oid, id, markdown, Annotation, Attachment, Identifier, CodeableConcept, Coding, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Reference, Meta)
Short	DSTU2: maxValue additional types
Comments	Element `ElementDefinition.maxValue[x]` is mapped to FHIR R5 element `ElementDefinition.maxValue[x]` as `RelatedTo`. The mappings for `ElementDefinition.maxValue[x]` do not cover the following types: Address, Annotation, Attachment, base64Binary, boolean, code, CodeableConcept, Coding, ContactPoint, HumanName, id, Identifier, markdown, Meta, oid, Period, Range, Ratio, Reference, SampledData, Signature, string, Timing, uri. The target context `ElementDefinition.maxValue[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`. Except for date/date/instant, the type of the maxValue[x] SHALL be the same as the specified type of the element. For the date/dateTime/instant values, the type of maxValue[x] SHALL be either the same, or a a Duration which specifies a relative time limit to the current time. The duration value is positive, and is added to the current clock to determine the maximum allowable value. A maximum value for a Quantity is interpreted as an canonical maximum - e.g. you cannot provide 10g if the maximum value is 50mg.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.maxValue[x]` is mapped to FHIR R5 element `ElementDefinition.maxValue[x]` as `RelatedTo`. The mappings for `ElementDefinition.maxValue[x]` do not cover the following types: Address, Annotation, Attachment, base64Binary, boolean, code, CodeableConcept, Coding, ContactPoint, HumanName, id, Identifier, markdown, Meta, oid, Period, Range, Ratio, Reference, SampledData, Signature, string, Timing, uri. The target context `ElementDefinition.maxValue[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `ElementDefinition`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
338. Extension.extension:maxValue.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
340. Extension.extension:maxValue.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
342. Extension.extension:maxValue.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`maxValue`
344. Extension.extension:maxValue.value[x]
Definition	The maximum allowed value for the element. The value is inclusive. This is allowed for the types date, dateTime, instant, time, decimal, integer, and Quantity.
Short	Maximum Allowed Value (for some types)
Comments	Except for date/date/instant, the type of the maxValue[x] SHALL be the same as the specified type of the element. For the date/dateTime/instant values, the type of maxValue[x] SHALL be either the same, or a a Duration which specifies a relative time limit to the current time. The duration value is positive, and is added to the current clock to determine the maximum allowable value. A maximum value for a Quantity is interpreted as an canonical maximum - e.g. you cannot provide 10g if the maximum value is 50mg.
Control	0..1 This element is affected by the following invariants: ext-1
Type	Choice of: boolean, base64Binary, string, uri, code, oid, id, markdown, Annotation, Attachment, Identifier, CodeableConcept, Coding, Range, Period, Ratio, SampledData, Signature, HumanName, Address, ContactPoint, Timing, Reference, Meta
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
346. Extension.extension:maxLength
Slice Name	maxLength
Definition	DSTU2: `ElementDefinition.maxLength`
Short	DSTU2: Max length for strings
Comments	Element `ElementDefinition.maxLength` is mapped to FHIR R5 element `ElementDefinition.maxLength` as `Equivalent`. Receivers are not required to reject instances that exceed the maximum length. The full length could be stored. In some cases, data might be truncated, though truncation should be undertaken with care and an understanding of the consequences of doing so. If not specified, there is no conformance expectation for length support.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.maxLength` is mapped to FHIR R5 element `ElementDefinition.maxLength` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
348. Extension.extension:maxLength.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
350. Extension.extension:maxLength.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
352. Extension.extension:maxLength.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`maxLength`
354. Extension.extension:maxLength.value[x]
Definition	Indicates the maximum length in characters that is permitted to be present in conformant instances and which is expected to be supported by conformant consumers that support the element.
Short	Max length for strings
Comments	Receivers are not required to reject instances that exceed the maximum length. The full length could be stored. In some cases, data might be truncated, though truncation should be undertaken with care and an understanding of the consequences of doing so. If not specified, there is no conformance expectation for length support.
Control	0..1 This element is affected by the following invariants: ext-1
Type	integer
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
356. Extension.extension:condition
Slice Name	condition
Definition	DSTU2: `ElementDefinition.condition`
Short	DSTU2: condition
Comments	Element `ElementDefinition.condition` is mapped to FHIR R5 element `ElementDefinition.condition` as `Equivalent`.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.condition` is mapped to FHIR R5 element `ElementDefinition.condition` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
358. Extension.extension:condition.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
360. Extension.extension:condition.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
362. Extension.extension:condition.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`condition`
364. Extension.extension:condition.value[x]
Definition	A reference to an invariant that may make additional statements about the cardinality or value in the instance.
Short	Reference to invariant about presence
Control	0..1 This element is affected by the following invariants: ext-1
Type	id
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
366. Extension.extension:constraint
Slice Name	constraint
Definition	DSTU2: `ElementDefinition.constraint`
Short	DSTU2: constraint
Comments	Element `ElementDefinition.constraint` is mapped to FHIR R5 element `ElementDefinition.constraint` as `Equivalent`. Constraints should be declared on the "context" element - the lowest element in the hierarchy that is common to all nodes referenced by the constraint.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.constraint` is mapped to FHIR R5 element `ElementDefinition.constraint` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
368. Extension.extension:constraint.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
370. Extension.extension:constraint.extension
Definition	An Extension
Short	Extension
Control	4..*
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
372. Extension.extension:constraint.extension:key
Slice Name	key
Definition	DSTU2: `ElementDefinition.constraint.key`
Short	DSTU2: key
Comments	Element `ElementDefinition.constraint.key` is mapped to FHIR R5 element `ElementDefinition.constraint.key` as `Equivalent`.
Control	1..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.constraint.key` is mapped to FHIR R5 element `ElementDefinition.constraint.key` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
374. Extension.extension:constraint.extension:key.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
376. Extension.extension:constraint.extension:key.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
378. Extension.extension:constraint.extension:key.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`key`
380. Extension.extension:constraint.extension:key.value[x]
Definition	Allows identification of which elements have their cardinalities impacted by the constraint. Will not be referenced for constraints that do not affect cardinality.
Short	Target of 'condition' reference above
Control	1..1 This element is affected by the following invariants: ext-1
Type	id
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
382. Extension.extension:constraint.extension:requirements
Slice Name	requirements
Definition	DSTU2: `ElementDefinition.constraint.requirements`
Short	DSTU2: Why this constraint necessary or appropriate
Comments	Element `ElementDefinition.constraint.requirements` is mapped to FHIR R5 element `ElementDefinition.constraint.requirements` as `Equivalent`. To be used if the reason for the constraint may not be intuitive to all implementers.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.constraint.requirements` is mapped to FHIR R5 element `ElementDefinition.constraint.requirements` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
384. Extension.extension:constraint.extension:requirements.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
386. Extension.extension:constraint.extension:requirements.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
388. Extension.extension:constraint.extension:requirements.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`requirements`
390. Extension.extension:constraint.extension:requirements.value[x]
Definition	Description of why this constraint is necessary or appropriate.
Short	Why this constraint necessary or appropriate
Comments	To be used if the reason for the constraint may not be intuitive to all implementers.
Control	0..1 This element is affected by the following invariants: ext-1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
392. Extension.extension:constraint.extension:severity
Slice Name	severity
Definition	DSTU2: `ElementDefinition.constraint.severity`
Short	DSTU2: severity
Comments	Element `ElementDefinition.constraint.severity` is mapped to FHIR R5 element `ElementDefinition.constraint.severity` as `Equivalent`. This allows constraints to be asserted as "shall" (error) and "should" (warning).
Control	1..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.constraint.severity` is mapped to FHIR R5 element `ElementDefinition.constraint.severity` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
394. Extension.extension:constraint.extension:severity.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
396. Extension.extension:constraint.extension:severity.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
398. Extension.extension:constraint.extension:severity.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`severity`
400. Extension.extension:constraint.extension:severity.value[x]
Definition	Identifies the impact constraint violation has on the conformance of the instance.
Short	error \| warning
Comments	This allows constraints to be asserted as "shall" (error) and "should" (warning).
Control	1..1 This element is affected by the following invariants: ext-1
Binding	The codes SHALL be taken from ConstraintSeverity (required to `http://hl7.org/fhir/ValueSet/constraint-severity\|5.0.0`) SHALL applications comply with this constraint?
Type	code
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
402. Extension.extension:constraint.extension:human
Slice Name	human
Definition	DSTU2: `ElementDefinition.constraint.human`
Short	DSTU2: human
Comments	Element `ElementDefinition.constraint.human` is mapped to FHIR R5 element `ElementDefinition.constraint.human` as `Equivalent`. Should be expressed in business terms as much as possible.
Control	1..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.constraint.human` is mapped to FHIR R5 element `ElementDefinition.constraint.human` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
404. Extension.extension:constraint.extension:human.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
406. Extension.extension:constraint.extension:human.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
408. Extension.extension:constraint.extension:human.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`human`
410. Extension.extension:constraint.extension:human.value[x]
Definition	Text that can be used to describe the constraint in messages identifying that the constraint has been violated.
Short	Human description of constraint
Comments	Should be expressed in business terms as much as possible.
Control	1..1 This element is affected by the following invariants: ext-1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
412. Extension.extension:constraint.extension:xpath
Slice Name	xpath
Definition	DSTU2: `ElementDefinition.constraint.xpath` (new:string)
Short	DSTU2: XPath expression of constraint (new)
Comments	Element `ElementDefinition.constraint.xpath` has a context of ElementDefinition.constraint based on following the parent source element upwards and mapping to `ElementDefinition`. Element `ElementDefinition.constraint.xpath` has no mapping targets in FHIR R5. Typically, this is because the element has been added (is a new element). Elements SHALL use "f" as the namespace prefix for the FHIR namespace, and "x" for the xhtml namespace, and SHALL NOT use any other prefixes.
Control	1..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Used in Schematron tests of the validity of the resource. Element `ElementDefinition.constraint.xpath` has a context of ElementDefinition.constraint based on following the parent source element upwards and mapping to `ElementDefinition`. Element `ElementDefinition.constraint.xpath` has no mapping targets in FHIR R5. Typically, this is because the element has been added (is a new element).
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
414. Extension.extension:constraint.extension:xpath.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
416. Extension.extension:constraint.extension:xpath.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
418. Extension.extension:constraint.extension:xpath.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`xpath`
420. Extension.extension:constraint.extension:xpath.value[x]
Definition	An XPath expression of constraint that can be executed to see if this constraint is met.
Short	XPath expression of constraint
Comments	Elements SHALL use "f" as the namespace prefix for the FHIR namespace, and "x" for the xhtml namespace, and SHALL NOT use any other prefixes.
Control	1..1 This element is affected by the following invariants: ext-1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
422. Extension.extension:constraint.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`constraint`
424. Extension.extension:constraint.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	0..0 This element is affected by the following invariants: ext-1
Type	Choice of: base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, integer64, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, CodeableReference, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, RatioRange, Reference, SampledData, Signature, Timing, ContactDetail, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Availability, ExtendedContactDetail, Dosage, Meta
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
426. Extension.extension:mustSupport
Slice Name	mustSupport
Definition	DSTU2: `ElementDefinition.mustSupport`
Short	DSTU2: If the element must supported
Comments	Element `ElementDefinition.mustSupport` is mapped to FHIR R5 element `ElementDefinition.mustSupport` as `Equivalent`. "Something useful" is context dependent and impossible to describe in the base FHIR specification. For this reason, tue mustSupport flag is never set to true by the FHIR specification itself - it is only set to true in profiles. This is done in Resource Profiles, where the profile labels an element as mustSupport=true. When a profile does this, it SHALL also make clear exactly what kind of "support" is required, as this can mean many things. Note that an element that has the property IsModifier is not necessarily a "key" element (e.g. one of the important elements to make use of the resource), nor is it automatically mustSupport - however both of these things are more likely to be true for IsModifier elements than for other elements.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Allows a profile to set expectations for system capabilities beyond merely respecting cardinality constraints. Element `ElementDefinition.mustSupport` is mapped to FHIR R5 element `ElementDefinition.mustSupport` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
428. Extension.extension:mustSupport.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
430. Extension.extension:mustSupport.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
432. Extension.extension:mustSupport.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`mustSupport`
434. Extension.extension:mustSupport.value[x]
Definition	If true, implementations that produce or consume resources SHALL provide "support" for the element in some meaningful way. If false, the element may be ignored and not supported.
Short	If the element must supported
Comments	"Something useful" is context dependent and impossible to describe in the base FHIR specification. For this reason, tue mustSupport flag is never set to true by the FHIR specification itself - it is only set to true in profiles. This is done in Resource Profiles, where the profile labels an element as mustSupport=true. When a profile does this, it SHALL also make clear exactly what kind of "support" is required, as this can mean many things. Note that an element that has the property IsModifier is not necessarily a "key" element (e.g. one of the important elements to make use of the resource), nor is it automatically mustSupport - however both of these things are more likely to be true for IsModifier elements than for other elements.
Control	0..1 This element is affected by the following invariants: ext-1
Type	boolean
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
436. Extension.extension:isModifier
Slice Name	isModifier
Definition	DSTU2: `ElementDefinition.isModifier`
Short	DSTU2: isModifier
Comments	Element `ElementDefinition.isModifier` is mapped to FHIR R5 element `ElementDefinition.isModifier` as `Equivalent`. Only the definition of an element can set IsModifier true - either the specification itself or where an extension is originally defined. Once set, it cannot be changed in derived profiles. An element/extension that has isModifier=true SHOULD also have a minimum cardinality of 1, so that there is no lack of clarity about what to do if it is missing. If it can be missing, the definition SHALL make the meaning of a missing element clear.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Allows elements to be introduced into a specification that can't safely be ignored by applications that don't recognize them. Element `ElementDefinition.isModifier` is mapped to FHIR R5 element `ElementDefinition.isModifier` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
438. Extension.extension:isModifier.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
440. Extension.extension:isModifier.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
442. Extension.extension:isModifier.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`isModifier`
444. Extension.extension:isModifier.value[x]
Definition	If true, the value of this element affects the interpretation of the element or resource that contains it, and the value of the element cannot be ignored. Typically, this is used for status, negation and qualification codes. The effect of this is that the element cannot be ignored by systems: they SHALL either recognize the element and process it, and/or a pre-determination has been made that it is not relevant to their particular system.
Short	If this modifies the meaning of other elements
Comments	Only the definition of an element can set IsModifier true - either the specification itself or where an extension is originally defined. Once set, it cannot be changed in derived profiles. An element/extension that has isModifier=true SHOULD also have a minimum cardinality of 1, so that there is no lack of clarity about what to do if it is missing. If it can be missing, the definition SHALL make the meaning of a missing element clear.
Control	0..1 This element is affected by the following invariants: ext-1
Type	boolean
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
446. Extension.extension:isSummary
Slice Name	isSummary
Definition	DSTU2: `ElementDefinition.isSummary`
Short	DSTU2: isSummary
Comments	Element `ElementDefinition.isSummary` is mapped to FHIR R5 element `ElementDefinition.isSummary` as `Equivalent`. Some resources include a set of simple metadata, and some very large data. This element is used to reduce the quantity of data returned in searches. Note that servers may pre-cache summarized resources for optimal performance, so servers may not support per-profile use of the isSummary flag.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Allow clients to search through large resources quickly. Element `ElementDefinition.isSummary` is mapped to FHIR R5 element `ElementDefinition.isSummary` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
448. Extension.extension:isSummary.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
450. Extension.extension:isSummary.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
452. Extension.extension:isSummary.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`isSummary`
454. Extension.extension:isSummary.value[x]
Definition	Whether the element should be included if a client requests a search with the parameter _summary=true.
Short	Include when _summary = true?
Comments	Some resources include a set of simple metadata, and some very large data. This element is used to reduce the quantity of data returned in searches. Note that servers may pre-cache summarized resources for optimal performance, so servers may not support per-profile use of the isSummary flag.
Control	0..1 This element is affected by the following invariants: ext-1
Type	boolean
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
456. Extension.extension:binding
Slice Name	binding
Definition	DSTU2: `ElementDefinition.binding`
Short	DSTU2: binding
Comments	Element `ElementDefinition.binding` is mapped to FHIR R5 element `ElementDefinition.binding` as `Equivalent`.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.binding` is mapped to FHIR R5 element `ElementDefinition.binding` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
458. Extension.extension:binding.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
460. Extension.extension:binding.extension
Definition	An Extension
Short	Extension
Control	1..*
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
462. Extension.extension:binding.extension:strength
Slice Name	strength
Definition	DSTU2: `ElementDefinition.binding.strength`
Short	DSTU2: strength
Comments	Element `ElementDefinition.binding.strength` is mapped to FHIR R5 element `ElementDefinition.binding.strength` as `Equivalent`. For further discussion, see Using Terminologies.
Control	1..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.binding.strength` is mapped to FHIR R5 element `ElementDefinition.binding.strength` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
464. Extension.extension:binding.extension:strength.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
466. Extension.extension:binding.extension:strength.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
468. Extension.extension:binding.extension:strength.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`strength`
470. Extension.extension:binding.extension:strength.value[x]
Definition	Indicates the degree of conformance expectations associated with this binding - that is, the degree to which the provided value set must be adhered to in the instances.
Short	required \| extensible \| preferred \| example
Comments	For further discussion, see Using Terminologies.
Control	1..1 This element is affected by the following invariants: ext-1
Binding	The codes SHALL be taken from BindingStrength (required to `http://hl7.org/fhir/ValueSet/binding-strength\|5.0.0`) Indication of the degree of conformance expectations associated with a binding.
Type	code
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
472. Extension.extension:binding.extension:description
Slice Name	description
Definition	DSTU2: `ElementDefinition.binding.description`
Short	DSTU2: Human explanation of the value set
Comments	Element `ElementDefinition.binding.description` is mapped to FHIR R5 element `ElementDefinition.binding.description` as `Equivalent`.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.binding.description` is mapped to FHIR R5 element `ElementDefinition.binding.description` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
474. Extension.extension:binding.extension:description.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
476. Extension.extension:binding.extension:description.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
478. Extension.extension:binding.extension:description.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`description`
480. Extension.extension:binding.extension:description.value[x]
Definition	Describes the intended use of this particular set of codes.
Short	Human explanation of the value set
Control	0..1 This element is affected by the following invariants: ext-1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
482. Extension.extension:binding.extension:valueSet
Slice Name	valueSet
Definition	DSTU2: `ElementDefinition.binding.valueSet[x]` additional types (Reference(http://hl7.org/fhir/StructureDefinition/ValueSet)) additional types from child elements (display, reference)
Short	DSTU2: Source of value set additional types
Comments	Element `ElementDefinition.binding.valueSet[x]` is mapped to FHIR R5 element `ElementDefinition.binding.valueSet` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.binding.valueSet[x]` do not cover the following types: Reference. The mappings for `ElementDefinition.binding.valueSet[x]` do not cover the following types based on type expansion: display, reference. For value sets with a referenceResource, the display can contain the value set description. The reference may be version-specific or not.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.binding.valueSet[x]` is mapped to FHIR R5 element `ElementDefinition.binding.valueSet` as `SourceIsBroaderThanTarget`. The mappings for `ElementDefinition.binding.valueSet[x]` do not cover the following types: Reference. The mappings for `ElementDefinition.binding.valueSet[x]` do not cover the following types based on type expansion: display, reference.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
484. Extension.extension:binding.extension:valueSet.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
486. Extension.extension:binding.extension:valueSet.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
488. Extension.extension:binding.extension:valueSet.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`valueSet`
490. Extension.extension:binding.extension:valueSet.value[x]
Definition	Points to the value set or external definition (e.g. implicit value set) that identifies the set of codes to be used.
Short	Source of value set
Comments	For value sets with a referenceResource, the display can contain the value set description. The reference may be version-specific or not.
Control	0..1 This element is affected by the following invariants: ext-1
Type	Reference(Cross-version Profile for DSTU2.ValueSet for use in FHIR R5, ValueSet)
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
492. Extension.extension:binding.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`binding`
494. Extension.extension:binding.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	0..0 This element is affected by the following invariants: ext-1
Type	Choice of: base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, integer64, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, CodeableReference, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, RatioRange, Reference, SampledData, Signature, Timing, ContactDetail, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Availability, ExtendedContactDetail, Dosage, Meta
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
496. Extension.extension:mapping
Slice Name	mapping
Definition	DSTU2: `ElementDefinition.mapping`
Short	DSTU2: mapping
Comments	Element `ElementDefinition.mapping` is mapped to FHIR R5 element `ElementDefinition.mapping` as `Equivalent`. Mappings are not necessarily specific enough for safe translation.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Provides guidance to implementers familiar with or converting content from other specifications. Element `ElementDefinition.mapping` is mapped to FHIR R5 element `ElementDefinition.mapping` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
498. Extension.extension:mapping.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
500. Extension.extension:mapping.extension
Definition	An Extension
Short	Extension
Control	2..*
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
502. Extension.extension:mapping.extension:identity
Slice Name	identity
Definition	DSTU2: `ElementDefinition.mapping.identity`
Short	DSTU2: identity
Comments	Element `ElementDefinition.mapping.identity` is mapped to FHIR R5 element `ElementDefinition.mapping.identity` as `Equivalent`.
Control	1..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.mapping.identity` is mapped to FHIR R5 element `ElementDefinition.mapping.identity` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
504. Extension.extension:mapping.extension:identity.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
506. Extension.extension:mapping.extension:identity.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
508. Extension.extension:mapping.extension:identity.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`identity`
510. Extension.extension:mapping.extension:identity.value[x]
Definition	An internal reference to the definition of a mapping.
Short	Reference to mapping declaration
Control	1..1 This element is affected by the following invariants: ext-1
Type	id
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
512. Extension.extension:mapping.extension:language
Slice Name	language
Definition	DSTU2: `ElementDefinition.mapping.language`
Short	DSTU2: language
Comments	Element `ElementDefinition.mapping.language` is mapped to FHIR R5 element `ElementDefinition.mapping.language` as `Equivalent`. If omitted, then there can be no expectation of computational interpretation of the mapping.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.mapping.language` is mapped to FHIR R5 element `ElementDefinition.mapping.language` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
514. Extension.extension:mapping.extension:language.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
516. Extension.extension:mapping.extension:language.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
518. Extension.extension:mapping.extension:language.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`language`
520. Extension.extension:mapping.extension:language.value[x]
Definition	Identifies the computable language in which mapping.map is expressed.
Short	Computable language of mapping
Comments	If omitted, then there can be no expectation of computational interpretation of the mapping.
Control	0..1 This element is affected by the following invariants: ext-1
Type	code
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
522. Extension.extension:mapping.extension:map
Slice Name	map
Definition	DSTU2: `ElementDefinition.mapping.map`
Short	DSTU2: map
Comments	Element `ElementDefinition.mapping.map` is mapped to FHIR R5 element `ElementDefinition.mapping.map` as `Equivalent`. For most mappings, the syntax is undefined. Syntax will be provided for mappings to the RIM. Multiple mappings may be possible and may include constraints on other resource elements that identify when a particular mapping applies.
Control	1..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `ElementDefinition.mapping.map` is mapped to FHIR R5 element `ElementDefinition.mapping.map` as `Equivalent`.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
524. Extension.extension:mapping.extension:map.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1 This element is affected by the following invariants: ele-1
Type	id
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
526. Extension.extension:mapping.extension:map.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
528. Extension.extension:mapping.extension:map.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`map`
530. Extension.extension:mapping.extension:map.value[x]
Definition	Expresses what part of the target specification corresponds to this element.
Short	Details of the mapping
Comments	For most mappings, the syntax is undefined. Syntax will be provided for mappings to the RIM. Multiple mappings may be possible and may include constraints on other resource elements that identify when a particular mapping applies.
Control	1..1 This element is affected by the following invariants: ext-1
Type	string
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
532. Extension.extension:mapping.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`mapping`
534. Extension.extension:mapping.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	0..0 This element is affected by the following invariants: ext-1
Type	Choice of: base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, integer64, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, CodeableReference, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, RatioRange, Reference, SampledData, Signature, Timing, ContactDetail, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Availability, ExtendedContactDetail, Dosage, Meta
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
536. Extension.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	`http://hl7.org/fhir/1.0/StructureDefinition/extension-StructureDefinition.differential.element`
538. Extension.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	0..0 This element is affected by the following invariants: ext-1
Type	Choice of: base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, integer64, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, CodeableReference, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, RatioRange, Reference, SampledData, Signature, Timing, ContactDetail, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Availability, ExtendedContactDetail, Dosage, Meta
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)