ExtensionAllergyIntolerance_Participant - Definitions - Extensions for Using Data Elements from FHIR R5 in FHIR R4 v0.1.0

Extensions for Using Data Elements from FHIR R5 in FHIR R4 - Downloaded Version null See the Directory of published versions

Extension: ExtensionAllergyIntolerance_Participant - Detailed Descriptions

Page standards status: Trial-use

Maturity Level: 0

Definitions for the ext-R5-AllergyIntolerance.participant 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	R5: `AllergyIntolerance.participant` (new:BackboneElement) Optional Extension Element - found in all resources.
Short	R5: Who or what participated in the activities related to the allergy or intolerance and how they were involved (new)Optional Extensions Element
Comments	Element `AllergyIntolerance.participant` has a context of AllergyIntolerance based on following the parent source element upwards and mapping to `AllergyIntolerance`. Element `AllergyIntolerance.participant` has no mapping targets in FHIR R4. Typically, this is because the element has been added (is a new element).
Control	0..* This element is affected by the following invariants: ele-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()`) 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 manageable, 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:function
Slice Name	function
Definition	R5: `AllergyIntolerance.participant.function` (new:CodeableConcept)
Short	R5: Type of involvement (new)Additional content defined by implementations
Comments	Element `AllergyIntolerance.participant.function` is part of an existing definition because parent element `AllergyIntolerance.participant` requires a cross-version extension. Element `AllergyIntolerance.participant.function` has a context of AllergyIntolerance based on following the parent source element upwards and mapping to `AllergyIntolerance`. Element `AllergyIntolerance.participant.function` has no mapping targets in FHIR R4. Typically, this is because the element has been added (is a new element).
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `AllergyIntolerance.participant.function` is part of an existing definition because parent element `AllergyIntolerance.participant` requires a cross-version extension. Element `AllergyIntolerance.participant.function` has a context of AllergyIntolerance based on following the parent source element upwards and mapping to `AllergyIntolerance`. Element `AllergyIntolerance.participant.function` has no mapping targets in FHIR R4. 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())
6. Extension.extension:function.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	`function`
8. Extension.extension:function.value[x]
Definition	Distinguishes the type of involvement of the actor in the activities related to the allergy or intolerance. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Type of involvementValue of extension
Control	0..1
Binding	Unless not suitable, these codes SHALL be taken from For codes, see ParticipationRoleType (extensible to `http://hl7.org/fhir/ValueSet/participation-role-type\|4.0.1`)
Type	CodeableConcept, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, positiveInt, Distance, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ParameterDefinition, dateTime, code, string, Contributor, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, 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()))
10. Extension.extension:actor
Slice Name	actor
Definition	R5: `AllergyIntolerance.participant.actor` (new:Reference(Practitioner,PractitionerRole,Patient,RelatedPerson,Device,Organization,CareTeam))
Short	R5: Who or what participated in the activities related to the allergy or intolerance (new)Additional content defined by implementations
Comments	Element `AllergyIntolerance.participant.actor` is part of an existing definition because parent element `AllergyIntolerance.participant` requires a cross-version extension. Element `AllergyIntolerance.participant.actor` has a context of AllergyIntolerance based on following the parent source element upwards and mapping to `AllergyIntolerance`. Element `AllergyIntolerance.participant.actor` has no mapping targets in FHIR R4. Typically, this is because the element has been added (is a new element).
Control	10..1*
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `AllergyIntolerance.participant.actor` is part of an existing definition because parent element `AllergyIntolerance.participant` requires a cross-version extension. Element `AllergyIntolerance.participant.actor` has a context of AllergyIntolerance based on following the parent source element upwards and mapping to `AllergyIntolerance`. Element `AllergyIntolerance.participant.actor` has no mapping targets in FHIR R4. 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())
12. Extension.extension:actor.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	`actor`
14. Extension.extension:actor.value[x]
Definition	Indicates who or what participated in the activities related to the allergy or intolerance. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Who or what participated in the activities related to the allergy or intoleranceValue of extension
Control	10..1
Type	Reference(Cross-version Profile for R5.Practitioner for use in FHIR R4, Practitioner, Cross-version Profile for R5.PractitionerRole for use in FHIR R4, PractitionerRole, Cross-version Profile for R5.Patient for use in FHIR R4, Patient, Cross-version Profile for R5.RelatedPerson for use in FHIR R4, RelatedPerson, Cross-version Profile for R5.Device for use in FHIR R4, Device, Cross-version Profile for R5.Organization for use in FHIR R4, Organization, Cross-version Profile for R5.CareTeam for use in FHIR R4, CareTeam), date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, positiveInt, Distance, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, CodeableConcept, ParameterDefinition, dateTime, code, string, Contributor, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, 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()))
16. 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/5.0/StructureDefinition/extension-AllergyIntolerance.participant`
18. 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
Type	Choice of: base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, Reference, SampledData, Signature, Timing, ContactDetail, Contributor, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, 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	R5: `AllergyIntolerance.participant` (new:BackboneElement)
Short	R5: Who or what participated in the activities related to the allergy or intolerance and how they were involved (new)
Comments	Element `AllergyIntolerance.participant` has a context of AllergyIntolerance based on following the parent source element upwards and mapping to `AllergyIntolerance`. Element `AllergyIntolerance.participant` has no mapping targets in FHIR R4. Typically, this is because the element has been added (is a new element).
Control	0..*
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:function
Slice Name	function
Definition	R5: `AllergyIntolerance.participant.function` (new:CodeableConcept)
Short	R5: Type of involvement (new)
Comments	Element `AllergyIntolerance.participant.function` is part of an existing definition because parent element `AllergyIntolerance.participant` requires a cross-version extension. Element `AllergyIntolerance.participant.function` has a context of AllergyIntolerance based on following the parent source element upwards and mapping to `AllergyIntolerance`. Element `AllergyIntolerance.participant.function` has no mapping targets in FHIR R4. Typically, this is because the element has been added (is a new element).
Control	0..1
Requirements	Element `AllergyIntolerance.participant.function` is part of an existing definition because parent element `AllergyIntolerance.participant` requires a cross-version extension. Element `AllergyIntolerance.participant.function` has a context of AllergyIntolerance based on following the parent source element upwards and mapping to `AllergyIntolerance`. Element `AllergyIntolerance.participant.function` has no mapping targets in FHIR R4. Typically, this is because the element has been added (is a new element).
6. Extension.extension:function.url
Control	1..1
Fixed Value	`function`
8. Extension.extension:function.value[x]
Definition	Distinguishes the type of involvement of the actor in the activities related to the allergy or intolerance.
Short	Type of involvement
Control	0..1
Binding	Unless not suitable, these codes SHALL be taken from ParticipationRoleType (extensible to `http://hl7.org/fhir/ValueSet/participation-role-type\|4.0.1`)
Type	CodeableConcept
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
10. Extension.extension:actor
Slice Name	actor
Definition	R5: `AllergyIntolerance.participant.actor` (new:Reference(Practitioner,PractitionerRole,Patient,RelatedPerson,Device,Organization,CareTeam))
Short	R5: Who or what participated in the activities related to the allergy or intolerance (new)
Comments	Element `AllergyIntolerance.participant.actor` is part of an existing definition because parent element `AllergyIntolerance.participant` requires a cross-version extension. Element `AllergyIntolerance.participant.actor` has a context of AllergyIntolerance based on following the parent source element upwards and mapping to `AllergyIntolerance`. Element `AllergyIntolerance.participant.actor` has no mapping targets in FHIR R4. Typically, this is because the element has been added (is a new element).
Control	1..1
Requirements	Element `AllergyIntolerance.participant.actor` is part of an existing definition because parent element `AllergyIntolerance.participant` requires a cross-version extension. Element `AllergyIntolerance.participant.actor` has a context of AllergyIntolerance based on following the parent source element upwards and mapping to `AllergyIntolerance`. Element `AllergyIntolerance.participant.actor` has no mapping targets in FHIR R4. Typically, this is because the element has been added (is a new element).
12. Extension.extension:actor.url
Control	1..1
Fixed Value	`actor`
14. Extension.extension:actor.value[x]
Definition	Indicates who or what participated in the activities related to the allergy or intolerance.
Short	Who or what participated in the activities related to the allergy or intolerance
Control	1..1
Type	Reference(Cross-version Profile for R5.Practitioner for use in FHIR R4, Practitioner, Cross-version Profile for R5.PractitionerRole for use in FHIR R4, PractitionerRole, Cross-version Profile for R5.Patient for use in FHIR R4, Patient, Cross-version Profile for R5.RelatedPerson for use in FHIR R4, RelatedPerson, Cross-version Profile for R5.Device for use in FHIR R4, Device, Cross-version Profile for R5.Organization for use in FHIR R4, Organization, Cross-version Profile for R5.CareTeam for use in FHIR R4, CareTeam)
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
16. Extension.url
Control	1..1
Fixed Value	`http://hl7.org/fhir/5.0/StructureDefinition/extension-AllergyIntolerance.participant`
18. Extension.value[x]
Control	0..0

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

0. Extension
Definition	R5: `AllergyIntolerance.participant` (new:BackboneElement)
Short	R5: Who or what participated in the activities related to the allergy or intolerance and how they were involved (new)
Comments	Element `AllergyIntolerance.participant` has a context of AllergyIntolerance based on following the parent source element upwards and mapping to `AllergyIntolerance`. Element `AllergyIntolerance.participant` has no mapping targets in FHIR R4. Typically, this is because the element has been added (is a new element).
Control	0..* This element is affected by the following invariants: ele-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
Type	string
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:function
Slice Name	function
Definition	R5: `AllergyIntolerance.participant.function` (new:CodeableConcept)
Short	R5: Type of involvement (new)
Comments	Element `AllergyIntolerance.participant.function` is part of an existing definition because parent element `AllergyIntolerance.participant` requires a cross-version extension. Element `AllergyIntolerance.participant.function` has a context of AllergyIntolerance based on following the parent source element upwards and mapping to `AllergyIntolerance`. Element `AllergyIntolerance.participant.function` has no mapping targets in FHIR R4. Typically, this is because the element has been added (is a new element).
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `AllergyIntolerance.participant.function` is part of an existing definition because parent element `AllergyIntolerance.participant` requires a cross-version extension. Element `AllergyIntolerance.participant.function` has a context of AllergyIntolerance based on following the parent source element upwards and mapping to `AllergyIntolerance`. Element `AllergyIntolerance.participant.function` has no mapping targets in FHIR R4. 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()`)
8. Extension.extension:function.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
Type	string
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
10. Extension.extension:function.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 manageable, 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:function.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	`function`
14. Extension.extension:function.value[x]
Definition	Distinguishes the type of involvement of the actor in the activities related to the allergy or intolerance.
Short	Type of involvement
Control	0..1
Binding	Unless not suitable, these codes SHALL be taken from ParticipationRoleType (extensible to `http://hl7.org/fhir/ValueSet/participation-role-type\|4.0.1`)
Type	CodeableConcept
[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())`)
16. Extension.extension:actor
Slice Name	actor
Definition	R5: `AllergyIntolerance.participant.actor` (new:Reference(Practitioner,PractitionerRole,Patient,RelatedPerson,Device,Organization,CareTeam))
Short	R5: Who or what participated in the activities related to the allergy or intolerance (new)
Comments	Element `AllergyIntolerance.participant.actor` is part of an existing definition because parent element `AllergyIntolerance.participant` requires a cross-version extension. Element `AllergyIntolerance.participant.actor` has a context of AllergyIntolerance based on following the parent source element upwards and mapping to `AllergyIntolerance`. Element `AllergyIntolerance.participant.actor` has no mapping targets in FHIR R4. Typically, this is because the element has been added (is a new element).
Control	1..1
Type	Extension
Is Modifier	false
Summary	false
Requirements	Element `AllergyIntolerance.participant.actor` is part of an existing definition because parent element `AllergyIntolerance.participant` requires a cross-version extension. Element `AllergyIntolerance.participant.actor` has a context of AllergyIntolerance based on following the parent source element upwards and mapping to `AllergyIntolerance`. Element `AllergyIntolerance.participant.actor` has no mapping targets in FHIR R4. 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()`)
18. Extension.extension:actor.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
Type	string
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
20. Extension.extension:actor.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 manageable, 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:actor.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	`actor`
24. Extension.extension:actor.value[x]
Definition	Indicates who or what participated in the activities related to the allergy or intolerance.
Short	Who or what participated in the activities related to the allergy or intolerance
Control	1..1
Type	Reference(Cross-version Profile for R5.Practitioner for use in FHIR R4, Practitioner, Cross-version Profile for R5.PractitionerRole for use in FHIR R4, PractitionerRole, Cross-version Profile for R5.Patient for use in FHIR R4, Patient, Cross-version Profile for R5.RelatedPerson for use in FHIR R4, RelatedPerson, Cross-version Profile for R5.Device for use in FHIR R4, Device, Cross-version Profile for R5.Organization for use in FHIR R4, Organization, Cross-version Profile for R5.CareTeam for use in FHIR R4, CareTeam)
[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())`)
26. 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/5.0/StructureDefinition/extension-AllergyIntolerance.participant`
28. 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
Type	Choice of: base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, Reference, SampledData, Signature, Timing, ContactDetail, Contributor, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, 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())`)