HL7.FHIR.US.CODEX-RADIATION-THERAPY\Dose Planned to Volume - Definitions

This page is part of the CodeX™ Radiation Therapy (v1.0.0: STU 1) based on FHIR R4. This is the current published version. For a full list of available versions, see the Directory of published versions

Extension: RadiotherapyDosePlannedToVolume - Detailed Descriptions

Draft as of 2023-07-28

Definitions for the codexrt-radiotherapy-dose-planned-to-volume extension.

Differential Elements Table
Key Elements Table
Snapshot Elements Table

Guidance on how to interpret the contents of this table can be found here.

1. Extension
Definition	Dose parameters planned for one radiotherapy volume. Optional Extension Element - found in all resources.
2. Extension.extension
Control	10..*
3. Extension.extension:volume
SliceName	volume
Definition	A BodyStructure resource representing the body structure to be treated, for example, Chest Wall Lymph Nodes.
Control	1..1
Must Support	true
4. Extension.extension:volume.extension
Control	0..0
5. Extension.extension:volume.url
Control	0..?
Fixed Value	volume
6. Extension.extension:volume.value[x]
Control	1..?
Type	Reference(RadiotherapyVolume)
[x] Note	See Choice of Data Types for further information about how to use [x]
7. Extension.extension:fractionDose
SliceName	fractionDose
Definition	The dose planned per fraction to this volume.
Control	0..1
Must Support	true
8. Extension.extension:fractionDose.extension
Control	0..0
9. Extension.extension:fractionDose.url
Control	0..?
Fixed Value	fractionDose
10. Extension.extension:fractionDose.value[x]
Control	0..?
Type	Quantity
[x] Note	See Choice of Data Types for further information about how to use [x]
Pattern Value	<valueQuantity xmlns="http://hl7.org/fhir"> <system value="http://unitsofmeasure.org"/> <code value="cGy"/> </valueQuantity>
11. Extension.extension:totalDose
SliceName	totalDose
Definition	The total dose planned to this volume within the scope of this ServiceRequest.
Control	0..1
Must Support	true
12. Extension.extension:totalDose.extension
Control	0..0
13. Extension.extension:totalDose.url
Control	0..?
Fixed Value	totalDose
14. Extension.extension:totalDose.value[x]
Control	1..?
Type	Quantity
[x] Note	See Choice of Data Types for further information about how to use [x]
Pattern Value	<valueQuantity xmlns="http://hl7.org/fhir"> <system value="http://unitsofmeasure.org"/> <code value="cGy"/> </valueQuantity>
15. Extension.extension:fractions
SliceName	fractions
Definition	The planned number of fractions to deliver the dose. See also extension RadiotherapyFractionsPlanned which is used instead if fractions are the same for all volumes, i.e. in phases or plans.
Control	0..1
Must Support	true
16. Extension.extension:fractions.extension
Control	0..0
17. Extension.extension:fractions.url
Control	0..?
Fixed Value	fractions
18. Extension.extension:fractions.value[x]
Control	0..?
Type	positiveInt
[x] Note	See Choice of Data Types for further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
19. Extension.url
Fixed Value	http://hl7.org/fhir/us/codex-radiation-therapy/StructureDefinition/codexrt-radiotherapy-dose-planned-to-volume
20. Extension.value[x]
Control	0..01
[x] Note	See Choice of Data Types for further information about how to use [x]

Guidance on how to interpret the contents of this table can be found here.

1. Extension
Definition	Dose parameters planned for one radiotherapy volume. Optional Extension Element - found in all resources.
Control	0..* This element is affected by the following invariants: ele-1
Invariants	Defined on this element 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.
Control	10..*
Type	Extension
Summary	false
Alternate Names	extensions, user content
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.
Invariants	Defined on this element 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 are unordered and Open, and can be differentiated using the following discriminators: value @ url
3. Extension.extension:volume
SliceName	volume
Definition	A BodyStructure resource representing the body structure to be treated, for example, Chest Wall Lymph Nodes. 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.
Control	10..1*
Type	Extension
Must Support	true
Summary	false
Alternate Names	extensions, user content
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.
Invariants	Defined on this element 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())
4. Extension.extension:volume.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.
Control	0..0*
Type	Extension
Summary	false
Alternate Names	extensions, user content
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.
Invariants	Defined on this element 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 are unordered and Open, and can be differentiated using the following discriminators: value @ url
5. Extension.extension:volume.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Control	1..1
Type	uri
XML Representation	In the XML format, this property is represented as an attribute.
Summary	false
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.
Fixed Value	volume
6. Extension.extension:volume.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Control	10..1
Type	Choice of: Reference(RadiotherapyVolume), 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	See Choice of Data Types for further information about how to use [x]
Summary	false
Invariants	Defined on this element ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
7. Extension.extension:fractionDose
SliceName	fractionDose
Definition	The dose planned per fraction to this volume. 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.
Control	0..1*
Type	Extension
Must Support	true
Summary	false
Alternate Names	extensions, user content
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.
Invariants	Defined on this element 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:fractionDose.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.
Control	0..0*
Type	Extension
Summary	false
Alternate Names	extensions, user content
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.
Invariants	Defined on this element 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 are unordered and Open, and can be differentiated using the following discriminators: value @ url
9. Extension.extension:fractionDose.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Control	1..1
Type	uri
XML Representation	In the XML format, this property is represented as an attribute.
Summary	false
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.
Fixed Value	fractionDose
10. Extension.extension:fractionDose.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Control	0..1
Type	Choice of: Quantity, 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, Reference, TriggerDefinition, uri, url, Annotation, ContactDetail, boolean, Expression, Signature, unsignedInt, time
[x] Note	See Choice of Data Types for further information about how to use [x]
Summary	false
Pattern Value	<valueQuantity xmlns="http://hl7.org/fhir"> <system value="http://unitsofmeasure.org"/> <code value="cGy"/> </valueQuantity>
Invariants	Defined on this element ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
11. Extension.extension:totalDose
SliceName	totalDose
Definition	The total dose planned to this volume within the scope of this ServiceRequest. 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.
Control	0..1*
Type	Extension
Must Support	true
Summary	false
Alternate Names	extensions, user content
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.
Invariants	Defined on this element 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:totalDose.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.
Control	0..0*
Type	Extension
Summary	false
Alternate Names	extensions, user content
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.
Invariants	Defined on this element 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 are unordered and Open, and can be differentiated using the following discriminators: value @ url
13. Extension.extension:totalDose.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Control	1..1
Type	uri
XML Representation	In the XML format, this property is represented as an attribute.
Summary	false
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.
Fixed Value	totalDose
14. Extension.extension:totalDose.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Control	10..1
Type	Choice of: Quantity, 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, Reference, TriggerDefinition, uri, url, Annotation, ContactDetail, boolean, Expression, Signature, unsignedInt, time
[x] Note	See Choice of Data Types for further information about how to use [x]
Summary	false
Pattern Value	<valueQuantity xmlns="http://hl7.org/fhir"> <system value="http://unitsofmeasure.org"/> <code value="cGy"/> </valueQuantity>
Invariants	Defined on this element ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
15. Extension.extension:fractions
SliceName	fractions
Definition	The planned number of fractions to deliver the dose. See also extension RadiotherapyFractionsPlanned which is used instead if fractions are the same for all volumes, i.e. in phases or plans. 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.
Control	0..1*
Type	Extension
Must Support	true
Summary	false
Alternate Names	extensions, user content
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.
Invariants	Defined on this element 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())
16. Extension.extension:fractions.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.
Control	0..0*
Type	Extension
Summary	false
Alternate Names	extensions, user content
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.
Invariants	Defined on this element 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 are unordered and Open, and can be differentiated using the following discriminators: value @ url
17. Extension.extension:fractions.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Control	1..1
Type	uri
XML Representation	In the XML format, this property is represented as an attribute.
Summary	false
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.
Fixed Value	fractions
18. Extension.extension:fractions.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Control	0..1
Type	Choice of: positiveInt, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, Distance, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, CodeableConcept, 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	See Choice of Data Types for further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	Defined on this element ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
19. Extension.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Control	1..1
Type	uri
XML Representation	In the XML format, this property is represented as an attribute.
Summary	false
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.
Fixed Value	http://hl7.org/fhir/us/codex-radiation-therapy/StructureDefinition/codexrt-radiotherapy-dose-planned-to-volume
20. Extension.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
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
[x] Note	See Choice of Data Types for further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	Defined on this element 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 found here.

1. Extension
Definition	Dose parameters planned for one radiotherapy volume.
Control	0..* This element is affected by the following invariants: ele-1
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.
Control	0..1
Type	string
XML Representation	In the XML format, this property is represented as an attribute.
Summary	false
3. Extension.extension
Definition	An Extension
Control	1..*
Type	Extension
Summary	false
Invariants	Defined on this element 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 are unordered and Open, and can be differentiated using the following discriminators: value @ url
4. Extension.extension:volume
SliceName	volume
Definition	A BodyStructure resource representing the body structure to be treated, for example, Chest Wall Lymph Nodes.
Control	1..1
Type	Extension
Must Support	true
Summary	false
Invariants	Defined on this element 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())
5. Extension.extension:volume.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Control	0..1
Type	string
XML Representation	In the XML format, this property is represented as an attribute.
Summary	false
6. Extension.extension:volume.extension
Definition	An Extension
Control	0..0
Type	Extension
Summary	false
Invariants	Defined on this element 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 are unordered and Open, and can be differentiated using the following discriminators: value @ url
7. Extension.extension:volume.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Control	1..1
Type	uri
XML Representation	In the XML format, this property is represented as an attribute.
Summary	false
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.
Fixed Value	volume
8. Extension.extension:volume.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Control	1..1
Type	Reference(RadiotherapyVolume)
[x] Note	See Choice of Data Types for further information about how to use [x]
Summary	false
Invariants	Defined on this element ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
9. Extension.extension:fractionDose
SliceName	fractionDose
Definition	The dose planned per fraction to this volume.
Control	0..1
Type	Extension
Must Support	true
Summary	false
Invariants	Defined on this element 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())
10. Extension.extension:fractionDose.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Control	0..1
Type	string
XML Representation	In the XML format, this property is represented as an attribute.
Summary	false
11. Extension.extension:fractionDose.extension
Definition	An Extension
Control	0..0
Type	Extension
Summary	false
Invariants	Defined on this element 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 are unordered and Open, and can be differentiated using the following discriminators: value @ url
12. Extension.extension:fractionDose.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Control	1..1
Type	uri
XML Representation	In the XML format, this property is represented as an attribute.
Summary	false
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.
Fixed Value	fractionDose
13. Extension.extension:fractionDose.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Control	0..1
Type	Quantity
[x] Note	See Choice of Data Types for further information about how to use [x]
Summary	false
Pattern Value	<valueQuantity xmlns="http://hl7.org/fhir"> <system value="http://unitsofmeasure.org"/> <code value="cGy"/> </valueQuantity>
Invariants	Defined on this element ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
14. Extension.extension:totalDose
SliceName	totalDose
Definition	The total dose planned to this volume within the scope of this ServiceRequest.
Control	0..1
Type	Extension
Must Support	true
Summary	false
Invariants	Defined on this element 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())
15. Extension.extension:totalDose.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Control	0..1
Type	string
XML Representation	In the XML format, this property is represented as an attribute.
Summary	false
16. Extension.extension:totalDose.extension
Definition	An Extension
Control	0..0
Type	Extension
Summary	false
Invariants	Defined on this element 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 are unordered and Open, and can be differentiated using the following discriminators: value @ url
17. Extension.extension:totalDose.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Control	1..1
Type	uri
XML Representation	In the XML format, this property is represented as an attribute.
Summary	false
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.
Fixed Value	totalDose
18. Extension.extension:totalDose.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Control	1..1
Type	Quantity
[x] Note	See Choice of Data Types for further information about how to use [x]
Summary	false
Pattern Value	<valueQuantity xmlns="http://hl7.org/fhir"> <system value="http://unitsofmeasure.org"/> <code value="cGy"/> </valueQuantity>
Invariants	Defined on this element ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
19. Extension.extension:fractions
SliceName	fractions
Definition	The planned number of fractions to deliver the dose. See also extension RadiotherapyFractionsPlanned which is used instead if fractions are the same for all volumes, i.e. in phases or plans.
Control	0..1
Type	Extension
Must Support	true
Summary	false
Invariants	Defined on this element 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())
20. Extension.extension:fractions.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Control	0..1
Type	string
XML Representation	In the XML format, this property is represented as an attribute.
Summary	false
21. Extension.extension:fractions.extension
Definition	An Extension
Control	0..0
Type	Extension
Summary	false
Invariants	Defined on this element 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 are unordered and Open, and can be differentiated using the following discriminators: value @ url
22. Extension.extension:fractions.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Control	1..1
Type	uri
XML Representation	In the XML format, this property is represented as an attribute.
Summary	false
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.
Fixed Value	fractions
23. Extension.extension:fractions.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Control	0..1
Type	positiveInt
[x] Note	See Choice of Data Types for further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	Defined on this element ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
24. Extension.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Control	1..1
Type	uri
XML Representation	In the XML format, this property is represented as an attribute.
Summary	false
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.
Fixed Value	http://hl7.org/fhir/us/codex-radiation-therapy/StructureDefinition/codexrt-radiotherapy-dose-planned-to-volume
25. Extension.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
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
[x] Note	See Choice of Data Types for further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	Defined on this element ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))