Modality And Technique - Definitions - FHIR Osiris Implementation Guide v1.1.0

This page is part of the OSIRIS FHIR Implementation Guide (v1.1.0: Release) based on FHIR (HL7® FHIR® Standard) R4. This is the current published version. For a full list of available versions, see the Directory of published versions

Extension: ModalityAndTechnique - Detailed Descriptions

Draft as of 2025-04-03

Definitions for the modalityAndTechnique extension.

Key Elements Table
Differential Elements Table
Snapshot Elements Table

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

0. Extension
Définition	Modality And Technique Optional Extension Element - found in all resources.
Short	Modality And TechniqueOptional Extensions 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()`) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
2. Extension.extension
Définition	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
Commentaires	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
Résumé	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`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
4. Extension.extension:radiotherapyModality
Nom de la slice	radiotherapyModality
Définition	Modality of the radiotherapy procedure. Dicom Tag (300A,00C6).
Short	ModalityAdditional content defined by implementations
Control	10..1*
Type	Extension
Is Modifier	false
Must Support	true
Résumé	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())
6. Extension.extension:radiotherapyModality.extension
Définition	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
Commentaires	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..0*
Type	Extension
Is Modifier	false
Résumé	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
8. Extension.extension:radiotherapyModality.url
Définition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Commentaires	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.
Résumé	false
Fixed Value	`radiotherapyModality`
10. Extension.extension:radiotherapyModality.value[x]
Définition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	10..1
Binding	The codes SHALL be taken from For codes, see http://hl7.org/fhir/us/mcode/ValueSet/mcode-radiotherapy-modality-vs (required to `http://hl7.org/fhir/us/mcode/ValueSet/mcode-radiotherapy-modality-vs`)
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
Must Support	true
Résumé	false
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
12. Extension.extension:radiotherapyTechnique
Nom de la slice	radiotherapyTechnique
Définition	Technique of the radiotherapy procedure. Dicom Tag (300A,0009).
Short	TechniqueAdditional content defined by implementations
Control	10..1*
Type	Extension
Is Modifier	false
Must Support	true
Résumé	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())
14. Extension.extension:radiotherapyTechnique.extension
Définition	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
Commentaires	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..0*
Type	Extension
Is Modifier	false
Résumé	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
16. Extension.extension:radiotherapyTechnique.url
Définition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Commentaires	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.
Résumé	false
Fixed Value	`radiotherapyTechnique`
18. Extension.extension:radiotherapyTechnique.value[x]
Définition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	10..1
Binding	The codes SHALL be taken from For codes, see http://hl7.org/fhir/us/mcode/ValueSet/mcode-teleradiotherapy-photon-beam-technique-vs (required to `http://hl7.org/fhir/us/mcode/ValueSet/mcode-teleradiotherapy-photon-beam-technique-vs`)
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
Must Support	true
Résumé	false
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
20. Extension.extension:radiotherapyTreatmentMachinePlanned
Nom de la slice	radiotherapyTreatmentMachinePlanned
Définition	Name of the processing machine used for the emission of the beam. Dicom Tag (300A,00B2)
Short	Name of the machine used for the emission of the beamAdditional content defined by implementations
Control	0..1*
Type	Extension
Is Modifier	false
Must Support	true
Résumé	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())
22. Extension.extension:radiotherapyTreatmentMachinePlanned.extension
Définition	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
Commentaires	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..0*
Type	Extension
Is Modifier	false
Résumé	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
24. Extension.extension:radiotherapyTreatmentMachinePlanned.url
Définition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Commentaires	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.
Résumé	false
Fixed Value	`radiotherapyTreatmentMachinePlanned`
26. Extension.extension:radiotherapyTreatmentMachinePlanned.value[x]
Définition	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..1
Type	string, 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, 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
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Must Support	true
Résumé	false
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
28. Extension.url
Définition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Commentaires	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.
Résumé	false
Fixed Value	`https://ig-osiris.cancer.fr/ig/osiris/StructureDefinition/modalityAndTechnique`
30. Extension.value[x]
Définition	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
Résumé	false
Invariants	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

0. Extension
Définition	Modality And Technique
Short	Modality And Technique
2. Extension.extension
Control	2..?
4. Extension.extension:radiotherapyModality
Nom de la slice	radiotherapyModality
Définition	Modality of the radiotherapy procedure. Dicom Tag (300A,00C6).
Short	Modality
Control	1..1
Must Support	true
6. Extension.extension:radiotherapyModality.extension
Control	0..0
8. Extension.extension:radiotherapyModality.url
Fixed Value	`radiotherapyModality`
10. Extension.extension:radiotherapyModality.value[x]
Control	1..?
Binding	The codes SHALL be taken from http://hl7.org/fhir/us/mcode/ValueSet/mcode-radiotherapy-modality-vs (required to `http://hl7.org/fhir/us/mcode/ValueSet/mcode-radiotherapy-modality-vs`)
Type	CodeableConcept
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Must Support	true
12. Extension.extension:radiotherapyTechnique
Nom de la slice	radiotherapyTechnique
Définition	Technique of the radiotherapy procedure. Dicom Tag (300A,0009).
Short	Technique
Control	1..1
Must Support	true
14. Extension.extension:radiotherapyTechnique.extension
Control	0..0
16. Extension.extension:radiotherapyTechnique.url
Fixed Value	`radiotherapyTechnique`
18. Extension.extension:radiotherapyTechnique.value[x]
Control	1..?
Binding	The codes SHALL be taken from http://hl7.org/fhir/us/mcode/ValueSet/mcode-teleradiotherapy-photon-beam-technique-vs (required to `http://hl7.org/fhir/us/mcode/ValueSet/mcode-teleradiotherapy-photon-beam-technique-vs`)
Type	CodeableConcept
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Must Support	true
20. Extension.extension:radiotherapyTreatmentMachinePlanned
Nom de la slice	radiotherapyTreatmentMachinePlanned
Définition	Name of the processing machine used for the emission of the beam. Dicom Tag (300A,00B2)
Short	Name of the machine used for the emission of the beam
Control	0..1
Must Support	true
22. Extension.extension:radiotherapyTreatmentMachinePlanned.extension
Control	0..0
24. Extension.extension:radiotherapyTreatmentMachinePlanned.url
Fixed Value	`radiotherapyTreatmentMachinePlanned`
26. Extension.extension:radiotherapyTreatmentMachinePlanned.value[x]
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
Must Support	true
28. Extension.url
Fixed Value	`https://ig-osiris.cancer.fr/ig/osiris/StructureDefinition/modalityAndTechnique`
30. Extension.value[x]
Control	0..0

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

0. Extension
Définition	Modality And Technique
Short	Modality And Technique
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
Définition	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.
Résumé	false
4. Extension.extension
Définition	An Extension
Short	Extension
Control	2..*
Type	Extension
Is Modifier	false
Résumé	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:radiotherapyModality
Nom de la slice	radiotherapyModality
Définition	Modality of the radiotherapy procedure. Dicom Tag (300A,00C6).
Short	Modality
Control	1..1
Type	Extension
Is Modifier	false
Must Support	true
Résumé	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:radiotherapyModality.id
Définition	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.
Résumé	false
10. Extension.extension:radiotherapyModality.extension
Définition	An Extension
Short	Extension
Control	0..0
Type	Extension
Is Modifier	false
Résumé	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
12. Extension.extension:radiotherapyModality.url
Définition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Commentaires	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.
Résumé	false
Fixed Value	`radiotherapyModality`
14. Extension.extension:radiotherapyModality.value[x]
Définition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	1..1
Binding	The codes SHALL be taken from http://hl7.org/fhir/us/mcode/ValueSet/mcode-radiotherapy-modality-vs (required to `http://hl7.org/fhir/us/mcode/ValueSet/mcode-radiotherapy-modality-vs`)
Type	CodeableConcept
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Must Support	true
Résumé	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
16. Extension.extension:radiotherapyTechnique
Nom de la slice	radiotherapyTechnique
Définition	Technique of the radiotherapy procedure. Dicom Tag (300A,0009).
Short	Technique
Control	1..1
Type	Extension
Is Modifier	false
Must Support	true
Résumé	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()`)
18. Extension.extension:radiotherapyTechnique.id
Définition	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.
Résumé	false
20. Extension.extension:radiotherapyTechnique.extension
Définition	An Extension
Short	Extension
Control	0..0
Type	Extension
Is Modifier	false
Résumé	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
22. Extension.extension:radiotherapyTechnique.url
Définition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Commentaires	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.
Résumé	false
Fixed Value	`radiotherapyTechnique`
24. Extension.extension:radiotherapyTechnique.value[x]
Définition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	1..1
Binding	The codes SHALL be taken from http://hl7.org/fhir/us/mcode/ValueSet/mcode-teleradiotherapy-photon-beam-technique-vs (required to `http://hl7.org/fhir/us/mcode/ValueSet/mcode-teleradiotherapy-photon-beam-technique-vs`)
Type	CodeableConcept
[x] Note	SeeChoice of Data Typesfor further information about how to use [x]
Is Modifier	false
Must Support	true
Résumé	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
26. Extension.extension:radiotherapyTreatmentMachinePlanned
Nom de la slice	radiotherapyTreatmentMachinePlanned
Définition	Name of the processing machine used for the emission of the beam. Dicom Tag (300A,00B2)
Short	Name of the machine used for the emission of the beam
Control	0..1
Type	Extension
Is Modifier	false
Must Support	true
Résumé	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()`)
28. Extension.extension:radiotherapyTreatmentMachinePlanned.id
Définition	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.
Résumé	false
30. Extension.extension:radiotherapyTreatmentMachinePlanned.extension
Définition	An Extension
Short	Extension
Control	0..0
Type	Extension
Is Modifier	false
Résumé	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
32. Extension.extension:radiotherapyTreatmentMachinePlanned.url
Définition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Commentaires	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.
Résumé	false
Fixed Value	`radiotherapyTreatmentMachinePlanned`
34. Extension.extension:radiotherapyTreatmentMachinePlanned.value[x]
Définition	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..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
Must Support	true
Résumé	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
36. Extension.url
Définition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Commentaires	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.
Résumé	false
Fixed Value	`https://ig-osiris.cancer.fr/ig/osiris/StructureDefinition/modalityAndTechnique`
38. Extension.value[x]
Définition	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
Résumé	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)