Launch Contexts - Definitions - Structured Data Capture v3.0.0

Structured Data Capture, published by HL7 International / FHIR Infrastructure. This guide is not an authorized publication; it is the continuous build for version 3.0.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/sdc/ and changes regularly. See the Directory of published versions

Extension: LaunchContextExtension - Detailed Descriptions

Page standards status: Trial-use

Maturity Level: 3

Definitions for the sdc-questionnaire-launchContext extension.

Differential Elements Table
Key Elements Table
Snapshot Elements Table

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

0. Extension
Definition	Resources that provide context for form processing logic (pre-population, flow-control, drop-down selection, etc.) when creating/displaying/editing a QuestionnaireResponse.
Short	Context resources needed for Questionnaire
Comments	3 of these launch contexts are aligned with the existing SMART on FHIR "launch" contexts.
Invariants	sdcext-1: Types must be from the specified value set of resource types based on name: patient: Patient; user: Patient, Practitioner, PractitionerRole, RelatedPerson (could be a subset of these); encounter: Encounter; location: Location; study: ResearchStudy ((extension('name').value.where(code='patient' and system='http://hl7.org/fhir/uv/sdc/CodeSystem/launchContext').exists() implies extension('type').value = 'Patient') and (extension('name').value.where(code='user' and system='http://hl7.org/fhir/uv/sdc/CodeSystem/launchContext').exists() implies (extension('type').value='Patient' or extension('type').value='Practitioner' or extension('type').value='PractitionerRole' or extension('type').value='RelatedPerson')) and (extension('name').value.where(code='encounter' and system='http://hl7.org/fhir/uv/sdc/CodeSystem/launchContext').exists() implies extension('type').value = 'Encounter') and (extension('name').value.where(code='location' and system='http://hl7.org/fhir/uv/sdc/CodeSystem/launchContext').exists() implies extension('type').value = 'Location') and (extension('name').value.where(code='study' and system='http://hl7.org/fhir/uv/sdc/CodeSystem/launchContext').exists() implies extension('type').value = 'ResearchStudy'))
2. Extension.extension
Control	2..?
4. Extension.extension:name
Slice Name	name
Definition	The variable name the passed resource will be referenced by within the Questionnaire logic.
Short	Variable name
Control	1..1
6. Extension.extension:name.extension
Control	0..0
8. Extension.extension:name.url
Fixed Value	name
10. Extension.extension:name.value[x]
Control	1..?
Binding	Unless not suitable, these codes SHALL be taken from Questionnaire Launch Context Launch context codes for use in defining questionnaires context at launch time (NOTE: the Coding.code will be used for the variable name and that (at present) there is no support for Questionnaires that use multiple launch contexts which share a common code but different code systems. Also, all launch context codes must meet the requirements to be a valid FHIRPath name.).
Type	Coding
[x] Note	See Choice of Data Types for further information about how to use [x]
12. Extension.extension:type
Slice Name	type
Definition	The kind of resource to be provided.
Short	Resource type
Control	1..*
14. Extension.extension:type.extension
Control	0..0
16. Extension.extension:type.url
Fixed Value	type
18. Extension.extension:type.value[x]
Control	1..?
Binding	The codes SHALL be taken from ResourceType
Type	code
[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
20. Extension.extension:description
Slice Name	description
Definition	Guidance on the resource to be provided and what impact providing it will have on questionnaire behavior.
Short	Explanation of context element
Control	0..1
22. Extension.extension:description.extension
Control	0..0
24. Extension.extension:description.url
Fixed Value	description
26. Extension.extension:description.value[x]
Control	1..?
Type	string
[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
28. Extension.url
Fixed Value	http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-launchContext
30. Extension.value[x]
Control	0..0

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

0. Extension
Definition	Resources that provide context for form processing logic (pre-population, flow-control, drop-down selection, etc.) when creating/displaying/editing a QuestionnaireResponse. Optional Extension Element - found in all resources.
Short	Context resources needed for QuestionnaireOptional Extensions Element
Comments	3 of these launch contexts are aligned with the existing SMART on FHIR "launch" contexts.
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()`) sdcext-1: Types must be from the specified value set of resource types based on name: patient: Patient; user: Patient, Practitioner, PractitionerRole, RelatedPerson (could be a subset of these); encounter: Encounter; location: Location; study: ResearchStudy ((extension('name').value.where(code='patient' and system='http://hl7.org/fhir/uv/sdc/CodeSystem/launchContext').exists() implies extension('type').value = 'Patient') and (extension('name').value.where(code='user' and system='http://hl7.org/fhir/uv/sdc/CodeSystem/launchContext').exists() implies (extension('type').value='Patient' or extension('type').value='Practitioner' or extension('type').value='PractitionerRole' or extension('type').value='RelatedPerson')) and (extension('name').value.where(code='encounter' and system='http://hl7.org/fhir/uv/sdc/CodeSystem/launchContext').exists() implies extension('type').value = 'Encounter') and (extension('name').value.where(code='location' and system='http://hl7.org/fhir/uv/sdc/CodeSystem/launchContext').exists() implies extension('type').value = 'Location') and (extension('name').value.where(code='study' and system='http://hl7.org/fhir/uv/sdc/CodeSystem/launchContext').exists() implies extension('type').value = 'ResearchStudy')) 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	20..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
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:name
Slice Name	name
Definition	The variable name the passed resource will be referenced by within the Questionnaire logic.
Short	Variable nameAdditional content defined by implementations
Control	10..1*
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
6. Extension.extension:name.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	0..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 are unordered and Open, and can be differentiated using the following discriminators: value @ url
8. Extension.extension:name.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	name
10. Extension.extension:name.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	10..1
Binding	Unless not suitable, these codes SHALL be taken from For codes, see Questionnaire Launch Context Launch context codes for use in defining questionnaires context at launch time (NOTE: the Coding.code will be used for the variable name and that (at present) there is no support for Questionnaires that use multiple launch contexts which share a common code but different code systems. Also, all launch context codes must meet the requirements to be a valid FHIRPath name.).
Type	Coding, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, 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, 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]
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
12. Extension.extension:type
Slice Name	type
Definition	The kind of resource to be provided.
Short	Resource typeAdditional content defined by implementations
Control	10..*
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())
14. Extension.extension:type.extension
Definition	An Extension May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and 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	0..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 are unordered and Open, and can be differentiated using the following discriminators: value @ url
16. Extension.extension:type.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	type
18. Extension.extension:type.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	10..1
Binding	The codes SHALL be taken from For codes, see ResourceType
Type	code, 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, 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]
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()))
20. Extension.extension:description
Slice Name	description
Definition	Guidance on the resource to be provided and what impact providing it will have on questionnaire behavior.
Short	Explanation of context elementAdditional content defined by implementations
Control	0..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())
22. Extension.extension:description.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	0..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 are unordered and Open, and can be differentiated using the following discriminators: value @ url
24. Extension.extension:description.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	description
26. Extension.extension:description.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	10..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	See Choice of Data Types for further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
28. 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/uv/sdc/StructureDefinition/sdc-questionnaire-launchContext
30. 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()))

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

0. Extension
Definition	Resources that provide context for form processing logic (pre-population, flow-control, drop-down selection, etc.) when creating/displaying/editing a QuestionnaireResponse.
Short	Context resources needed for Questionnaire
Comments	3 of these launch contexts are aligned with the existing SMART on FHIR "launch" contexts.
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()`) sdcext-1: Types must be from the specified value set of resource types based on name: patient: Patient; user: Patient, Practitioner, PractitionerRole, RelatedPerson (could be a subset of these); encounter: Encounter; location: Location; study: ResearchStudy ((extension('name').value.where(code='patient' and system='http://hl7.org/fhir/uv/sdc/CodeSystem/launchContext').exists() implies extension('type').value = 'Patient') and (extension('name').value.where(code='user' and system='http://hl7.org/fhir/uv/sdc/CodeSystem/launchContext').exists() implies (extension('type').value='Patient' or extension('type').value='Practitioner' or extension('type').value='PractitionerRole' or extension('type').value='RelatedPerson')) and (extension('name').value.where(code='encounter' and system='http://hl7.org/fhir/uv/sdc/CodeSystem/launchContext').exists() implies extension('type').value = 'Encounter') and (extension('name').value.where(code='location' and system='http://hl7.org/fhir/uv/sdc/CodeSystem/launchContext').exists() implies extension('type').value = 'Location') and (extension('name').value.where(code='study' and system='http://hl7.org/fhir/uv/sdc/CodeSystem/launchContext').exists() implies extension('type').value = 'ResearchStudy'))
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	2..*
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension`. The slices are unordered and Open, and can be differentiated using the following discriminators: value @ url
6. Extension.extension:name
Slice Name	name
Definition	The variable name the passed resource will be referenced by within the Questionnaire logic.
Short	Variable name
Control	1..1
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
8. Extension.extension:name.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1
Type	string
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
10. Extension.extension:name.extension
Definition	An Extension
Short	Extension
Control	0..0
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices are unordered and Open, and can be differentiated using the following discriminators: value @ url
12. Extension.extension:name.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	name
14. Extension.extension:name.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	1..1
Binding	Unless not suitable, these codes SHALL be taken from Questionnaire Launch Context Launch context codes for use in defining questionnaires context at launch time (NOTE: the Coding.code will be used for the variable name and that (at present) there is no support for Questionnaires that use multiple launch contexts which share a common code but different code systems. Also, all launch context codes must meet the requirements to be a valid FHIRPath name.).
Type	Coding
[x] Note	See Choice of Data Types for 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:type
Slice Name	type
Definition	The kind of resource to be provided.
Short	Resource type
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()`)
18. Extension.extension:type.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1
Type	string
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
20. Extension.extension:type.extension
Definition	An Extension
Short	Extension
Control	0..0
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices are unordered and Open, and can be differentiated using the following discriminators: value @ url
22. Extension.extension:type.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	type
24. Extension.extension:type.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	1..1
Binding	The codes SHALL be taken from ResourceType
Type	code
[x] Note	See Choice of Data Types for further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
26. Extension.extension:description
Slice Name	description
Definition	Guidance on the resource to be provided and what impact providing it will have on questionnaire behavior.
Short	Explanation of context element
Control	0..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()`)
28. Extension.extension:description.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1
Type	string
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
30. Extension.extension:description.extension
Definition	An Extension
Short	Extension
Control	0..0
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices are unordered and Open, and can be differentiated using the following discriminators: value @ url
32. Extension.extension:description.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	description
34. Extension.extension:description.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	1..1
Type	string
[x] Note	See Choice of Data Types for further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
36. Extension.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/uv/sdc/StructureDefinition/sdc-questionnaire-launchContext
38. 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())`)