Evidence Based Medicine on FHIR Implementation Guide, published by HL7 International / Clinical Decision Support. This guide is not an authorized publication; it is the continuous build for version 2.0.0-ballot built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/ebm/ and changes regularly. See the Directory of published versions

• Content
• Detailed Descriptions
• Mappings
• Examples
• XML
• JSON
• TTL

Resource Profile: GroupAssignment

Profile of EvidenceVariable for Evidence Based Medicine IG. The GroupAssignment Profile is used to classify an EvidenceVariable as an exposure managed as a categorical variable. The variable definitions are found in the category element instead of the definition element.

Usage:

• Refer to this Resource Profile: ComparativeEvidenceReport, ComparativeEvidenceSynthesisReport, ComparativeEvidence, EvidenceMeasureReportPackage... Show 3 more, EvidenceTableReportPackage, NetEffectEstimate and OutcomeMeasureSynthesisReport
• Examples for this Resource Profile: GroupAssignment_Bariatric_Surgery_vs_no_bariatric_surgery, GroupAssignment_Roux_en_Y_gastric_bypass_vs_medical_treatment, GroupAssignment_Roux_en_Y_gastric_bypass_or_Biliopancreatic_Diversion_vs_medical_treatment, GroupAssignment_Roux_en_Y_gastric_bypass_surgery_vs_Lifestyle_intensive_medical_management_intervention_alone... Show 5 more, GroupAssignment_high_dose_xanomeline_vs_low_dose_xanomeline_vs_placebo, Therapeutic_dose_anticoagulation_with_heparin_vs_Usual_care_pharmacologic_thromboprophylaxis, GroupAssignment_ExposureDefinition_Bariatric_Surgery_RYGB_VSG_LAGB_BPD_vs_ComparatorDefinition_NOT_Bariatric_Surgery_RYGB_VSG_LAGB_BPD, GroupAssignment_SGLT2_inhibitors_vs_GLP_1_RA and GroupAssignment_ExposureGroup_JAMA_2018_Norwegian_cohort_study_Surgery_cohort_vs_ComparatorGroup_JAMA_2018_Norwegian_cohort_study_Control_cohort

Formal Views of Profile Content

Description of Profiles, Differentials, Snapshots and how the different presentations work.

• Differential Table
• Key Elements Table
• Snapshot Table
• Statistics/References
• All

This structure is derived from VariableDefinition

Name	Flags	Card.	Type	Description & Constraints
EvidenceVariable			VariableDefinition
definition
concept
coding		1..1	Coding	Code defined by a terminology system Required Pattern: At least the following
system		1..1	uri	Identity of the terminology system Fixed Value: https://fevir.net/resources/CodeSystem/179423
code		1..1	code	Symbol in syntax defined by the system Fixed Value: defined-in-handling-and-category
display		1..1	string	Representation defined by the system Fixed Value: Defined in handling and category elements
category		2..*	BackboneElement	A grouping for ordinal or polychotomous variables
name		1..1	string	Description of the grouping
Documentation for this format

Name	Flags	Card.	Type	Description & Constraints
EvidenceVariable	C	0..*	VariableDefinition	A definition of an exposure, outcome, or other variable cnl-0: Name should be usable as an identifier for the module by machine processing applications such as code generation
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
contained		0..*	Resource	Contained, inline Resources
Slices for extension				Content/Rules for all slices
classifier		0..*	CodeableConcept	Classification URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-classifier
conditional		0..1	Expression	When the variable is observed URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-conditional
dataStorage		0..*	(Complex)	How and where the data element (value of the variable) is found URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-data-storage
timing		0..1	(Complex)	Timing in which the characteristic is determined or action is taken URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/characteristic-timing
period		0..1	Period	Date(s) and time(s) when the variable is observed URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-period
constraint		0..*	(Complex)	Limit on acceptability of data value URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-constraint
missingDataMeaning		0..1	CodeableConcept	How missing data is interpreted URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-missing-data
unacceptableDataHandling		0..*	CodeableConcept	How erroneous data is processed URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-data-cleaning
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored
status	?!Σ	1..1	code	draft | active | retired | unknown Binding: PublicationStatus (required): The lifecycle status of an artifact.
handling		1..1	code	continuous | dichotomous | ordinal | polychotomous Binding: EvidenceVariableHandling (required)
category		2..*	BackboneElement	A grouping for ordinal or polychotomous variables
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
name		1..1	string	Description of the grouping
Documentation for this format

Terminology Bindings

Path	Conformance	ValueSet	URI
EvidenceVariable.status	required	PublicationStatus http://hl7.org/fhir/ValueSet/publication-status|6.0.0-ballot2 from the FHIR Standard
EvidenceVariable.handling	required	EvidenceVariableHandling http://hl7.org/fhir/ValueSet/variable-handling|6.0.0-ballot2 from the FHIR Standard

Constraints

Id	Grade	Path(s)	Details	Requirements
cnl-0	warning	EvidenceVariable	Name should be usable as an identifier for the module by machine processing applications such as code generation : name.exists() implies name.matches('^[A-Z]([A-Za-z0-9_]){1,254}$')
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()

Name	Flags	Card.	Type	Description & Constraints
EvidenceVariable	C	0..*	VariableDefinition	A definition of an exposure, outcome, or other variable cnl-0: Name should be usable as an identifier for the module by machine processing applications such as code generation
id	Σ	0..1	id	Logical id of this artifact
meta	Σ	0..1	Meta	Metadata about the resource
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
language		0..1	code	Language of the resource content Binding: AllLanguages (required): IETF language tag for a human language Additional Bindings Purpose CommonLanguages Starter Set
text		0..1	Narrative	Text summary of the resource, for human interpretation
contained		0..*	Resource	Contained, inline Resources
Slices for extension		0..*	Extension	Extension Slice: Unordered, Open by value:url
classifier		0..*	CodeableConcept	Classification URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-classifier
conditional		0..1	Expression	When the variable is observed URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-conditional
dataStorage		0..*	(Complex)	How and where the data element (value of the variable) is found URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-data-storage
timing		0..1	(Complex)	Timing in which the characteristic is determined or action is taken URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/characteristic-timing
period		0..1	Period	Date(s) and time(s) when the variable is observed URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-period
constraint		0..*	(Complex)	Limit on acceptability of data value URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-constraint
missingDataMeaning		0..1	CodeableConcept	How missing data is interpreted URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-missing-data
unacceptableDataHandling		0..*	CodeableConcept	How erroneous data is processed URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-data-cleaning
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored
url	ΣC	0..1	uri	Canonical identifier for this evidence variable, represented as a URI (globally unique) cnl-1: URL should not contain | or # - these characters make processing canonical references problematic
identifier	Σ	0..*	Identifier	Additional identifier for the evidence variable
version	Σ	0..1	string	Business version of the evidence variable
versionAlgorithm[x]	Σ	0..1		How to compare versions Binding: VersionAlgorithm (extensible)
versionAlgorithmString			string
versionAlgorithmCoding			Coding
name	ΣC	0..1	string	Name for this evidence variable (computer friendly)
title	Σ	0..1	string	Name for this evidence variable (human friendly)
shortTitle	Σ	0..1	string	Title for use in informal contexts
status	?!Σ	1..1	code	draft | active | retired | unknown Binding: PublicationStatus (required): The lifecycle status of an artifact.
experimental		0..1	boolean	For testing purposes, not real usage
date	Σ	0..1	dateTime	Date last changed
publisher	Σ	0..1	string	Name of the publisher/steward (organization or individual)
contact	Σ	0..*	ContactDetail	Contact details for the publisher
description	Σ	0..1	markdown	Natural language description of the evidence variable
note		0..*	Annotation	Used for footnotes or explanatory notes
useContext	Σ	0..*	UsageContext	The context that the content is intended to support
purpose		0..1	markdown	Why this EvidenceVariable is defined
copyright		0..1	markdown	Use and/or publishing restrictions
copyrightLabel		0..1	string	Copyright holder and year(s)
approvalDate		0..1	date	When the resource was approved by publisher
lastReviewDate		0..1	date	When the resource was last reviewed by the publisher
effectivePeriod		0..1	Period	When the resource is expected to be used
author		0..*	ContactDetail	Who authored the content
editor		0..*	ContactDetail	Who edited the content
reviewer		0..*	ContactDetail	Who reviewed the content
endorser		0..*	ContactDetail	Who endorsed the content
relatedArtifact		0..*	RelatedArtifact	Additional documentation, citations, etc
actual		0..1	boolean	Actual or conceptual
definition	Σ	0..1	CodeableReference(Group)	Defines the variable with a concept and/or Reference Binding: EvidenceVariableDefinition (example)
id		0..1	id	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
concept		0..1	CodeableConcept	Reference to a concept (by class)
id		0..1	id	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
coding		1..1	Coding	Code defined by a terminology system Required Pattern: At least the following
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
system		1..1	uri	Identity of the terminology system Fixed Value: https://fevir.net/resources/CodeSystem/179423
version		0..1	string	Version of the system - if relevant
code		1..1	code	Symbol in syntax defined by the system Fixed Value: defined-in-handling-and-category
display		1..1	string	Representation defined by the system Fixed Value: Defined in handling and category elements
userSelected		0..1	boolean	If this coding was chosen directly by the user
text		0..1	string	Plain text representation of the concept
reference		0..1	Reference()	Reference to a resource (by instance)
handling		1..1	code	continuous | dichotomous | ordinal | polychotomous Binding: EvidenceVariableHandling (required)
category		2..*	BackboneElement	A grouping for ordinal or polychotomous variables
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
name		1..1	string	Description of the grouping
value[x]		0..1		Definition of the grouping
valueCodeableConcept			CodeableConcept
valueQuantity			Quantity
valueRange			Range
valueReference			Reference(Group)
Documentation for this format

Terminology Bindings

Path	Conformance	ValueSet	URI
EvidenceVariable.language	required	AllLanguages http://hl7.org/fhir/ValueSet/all-languages|6.0.0-ballot2 from the FHIR Standard
EvidenceVariable.versionAlgorithm[x]	extensible	VersionAlgorithm http://hl7.org/fhir/ValueSet/version-algorithm from the FHIR Standard
EvidenceVariable.status	required	PublicationStatus http://hl7.org/fhir/ValueSet/publication-status|6.0.0-ballot2 from the FHIR Standard
EvidenceVariable.definition	example	EvidenceVariableDefinition http://hl7.org/fhir/ValueSet/evidence-variable-definition from the FHIR Standard
EvidenceVariable.handling	required	EvidenceVariableHandling http://hl7.org/fhir/ValueSet/variable-handling|6.0.0-ballot2 from the FHIR Standard

Constraints

Id	Grade	Path(s)	Details	Requirements
cnl-0	warning	EvidenceVariable	Name should be usable as an identifier for the module by machine processing applications such as code generation : name.exists() implies name.matches('^[A-Z]([A-Za-z0-9_]){1,254}$')
cnl-1	warning	EvidenceVariable.url	URL should not contain | or # - these characters make processing canonical references problematic : exists() implies matches('^[^|# ]+$')
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()

This structure is derived from VariableDefinition

Summary

Mandatory: 1 element(1 nested mandatory element)

Maturity: 1

Differential View

This structure is derived from VariableDefinition

Name	Flags	Card.	Type	Description & Constraints
EvidenceVariable			VariableDefinition
definition
concept
coding		1..1	Coding	Code defined by a terminology system Required Pattern: At least the following
system		1..1	uri	Identity of the terminology system Fixed Value: https://fevir.net/resources/CodeSystem/179423
code		1..1	code	Symbol in syntax defined by the system Fixed Value: defined-in-handling-and-category
display		1..1	string	Representation defined by the system Fixed Value: Defined in handling and category elements
category		2..*	BackboneElement	A grouping for ordinal or polychotomous variables
name		1..1	string	Description of the grouping
Documentation for this format

Key Elements View

Name	Flags	Card.	Type	Description & Constraints
EvidenceVariable	C	0..*	VariableDefinition	A definition of an exposure, outcome, or other variable cnl-0: Name should be usable as an identifier for the module by machine processing applications such as code generation
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
contained		0..*	Resource	Contained, inline Resources
Slices for extension				Content/Rules for all slices
classifier		0..*	CodeableConcept	Classification URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-classifier
conditional		0..1	Expression	When the variable is observed URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-conditional
dataStorage		0..*	(Complex)	How and where the data element (value of the variable) is found URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-data-storage
timing		0..1	(Complex)	Timing in which the characteristic is determined or action is taken URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/characteristic-timing
period		0..1	Period	Date(s) and time(s) when the variable is observed URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-period
constraint		0..*	(Complex)	Limit on acceptability of data value URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-constraint
missingDataMeaning		0..1	CodeableConcept	How missing data is interpreted URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-missing-data
unacceptableDataHandling		0..*	CodeableConcept	How erroneous data is processed URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-data-cleaning
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored
status	?!Σ	1..1	code	draft | active | retired | unknown Binding: PublicationStatus (required): The lifecycle status of an artifact.
handling		1..1	code	continuous | dichotomous | ordinal | polychotomous Binding: EvidenceVariableHandling (required)
category		2..*	BackboneElement	A grouping for ordinal or polychotomous variables
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
name		1..1	string	Description of the grouping
Documentation for this format

Terminology Bindings

Path	Conformance	ValueSet	URI
EvidenceVariable.status	required	PublicationStatus http://hl7.org/fhir/ValueSet/publication-status|6.0.0-ballot2 from the FHIR Standard
EvidenceVariable.handling	required	EvidenceVariableHandling http://hl7.org/fhir/ValueSet/variable-handling|6.0.0-ballot2 from the FHIR Standard

Constraints

Id	Grade	Path(s)	Details	Requirements
cnl-0	warning	EvidenceVariable	Name should be usable as an identifier for the module by machine processing applications such as code generation : name.exists() implies name.matches('^[A-Z]([A-Za-z0-9_]){1,254}$')
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()

Snapshot View

Name	Flags	Card.	Type	Description & Constraints
EvidenceVariable	C	0..*	VariableDefinition	A definition of an exposure, outcome, or other variable cnl-0: Name should be usable as an identifier for the module by machine processing applications such as code generation
id	Σ	0..1	id	Logical id of this artifact
meta	Σ	0..1	Meta	Metadata about the resource
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
language		0..1	code	Language of the resource content Binding: AllLanguages (required): IETF language tag for a human language Additional Bindings Purpose CommonLanguages Starter Set
text		0..1	Narrative	Text summary of the resource, for human interpretation
contained		0..*	Resource	Contained, inline Resources
Slices for extension		0..*	Extension	Extension Slice: Unordered, Open by value:url
classifier		0..*	CodeableConcept	Classification URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-classifier
conditional		0..1	Expression	When the variable is observed URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-conditional
dataStorage		0..*	(Complex)	How and where the data element (value of the variable) is found URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-data-storage
timing		0..1	(Complex)	Timing in which the characteristic is determined or action is taken URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/characteristic-timing
period		0..1	Period	Date(s) and time(s) when the variable is observed URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-period
constraint		0..*	(Complex)	Limit on acceptability of data value URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-constraint
missingDataMeaning		0..1	CodeableConcept	How missing data is interpreted URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-missing-data
unacceptableDataHandling		0..*	CodeableConcept	How erroneous data is processed URL: http://hl7.org/fhir/uv/ebm/StructureDefinition/evidence-variable-data-cleaning
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored
url	ΣC	0..1	uri	Canonical identifier for this evidence variable, represented as a URI (globally unique) cnl-1: URL should not contain | or # - these characters make processing canonical references problematic
identifier	Σ	0..*	Identifier	Additional identifier for the evidence variable
version	Σ	0..1	string	Business version of the evidence variable
versionAlgorithm[x]	Σ	0..1		How to compare versions Binding: VersionAlgorithm (extensible)
versionAlgorithmString			string
versionAlgorithmCoding			Coding
name	ΣC	0..1	string	Name for this evidence variable (computer friendly)
title	Σ	0..1	string	Name for this evidence variable (human friendly)
shortTitle	Σ	0..1	string	Title for use in informal contexts
status	?!Σ	1..1	code	draft | active | retired | unknown Binding: PublicationStatus (required): The lifecycle status of an artifact.
experimental		0..1	boolean	For testing purposes, not real usage
date	Σ	0..1	dateTime	Date last changed
publisher	Σ	0..1	string	Name of the publisher/steward (organization or individual)
contact	Σ	0..*	ContactDetail	Contact details for the publisher
description	Σ	0..1	markdown	Natural language description of the evidence variable
note		0..*	Annotation	Used for footnotes or explanatory notes
useContext	Σ	0..*	UsageContext	The context that the content is intended to support
purpose		0..1	markdown	Why this EvidenceVariable is defined
copyright		0..1	markdown	Use and/or publishing restrictions
copyrightLabel		0..1	string	Copyright holder and year(s)
approvalDate		0..1	date	When the resource was approved by publisher
lastReviewDate		0..1	date	When the resource was last reviewed by the publisher
effectivePeriod		0..1	Period	When the resource is expected to be used
author		0..*	ContactDetail	Who authored the content
editor		0..*	ContactDetail	Who edited the content
reviewer		0..*	ContactDetail	Who reviewed the content
endorser		0..*	ContactDetail	Who endorsed the content
relatedArtifact		0..*	RelatedArtifact	Additional documentation, citations, etc
actual		0..1	boolean	Actual or conceptual
definition	Σ	0..1	CodeableReference(Group)	Defines the variable with a concept and/or Reference Binding: EvidenceVariableDefinition (example)
id		0..1	id	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
concept		0..1	CodeableConcept	Reference to a concept (by class)
id		0..1	id	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
coding		1..1	Coding	Code defined by a terminology system Required Pattern: At least the following
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
system		1..1	uri	Identity of the terminology system Fixed Value: https://fevir.net/resources/CodeSystem/179423
version		0..1	string	Version of the system - if relevant
code		1..1	code	Symbol in syntax defined by the system Fixed Value: defined-in-handling-and-category
display		1..1	string	Representation defined by the system Fixed Value: Defined in handling and category elements
userSelected		0..1	boolean	If this coding was chosen directly by the user
text		0..1	string	Plain text representation of the concept
reference		0..1	Reference()	Reference to a resource (by instance)
handling		1..1	code	continuous | dichotomous | ordinal | polychotomous Binding: EvidenceVariableHandling (required)
category		2..*	BackboneElement	A grouping for ordinal or polychotomous variables
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
name		1..1	string	Description of the grouping
value[x]		0..1		Definition of the grouping
valueCodeableConcept			CodeableConcept
valueQuantity			Quantity
valueRange			Range
valueReference			Reference(Group)
Documentation for this format

Terminology Bindings

Path	Conformance	ValueSet	URI
EvidenceVariable.language	required	AllLanguages http://hl7.org/fhir/ValueSet/all-languages|6.0.0-ballot2 from the FHIR Standard
EvidenceVariable.versionAlgorithm[x]	extensible	VersionAlgorithm http://hl7.org/fhir/ValueSet/version-algorithm from the FHIR Standard
EvidenceVariable.status	required	PublicationStatus http://hl7.org/fhir/ValueSet/publication-status|6.0.0-ballot2 from the FHIR Standard
EvidenceVariable.definition	example	EvidenceVariableDefinition http://hl7.org/fhir/ValueSet/evidence-variable-definition from the FHIR Standard
EvidenceVariable.handling	required	EvidenceVariableHandling http://hl7.org/fhir/ValueSet/variable-handling|6.0.0-ballot2 from the FHIR Standard

Constraints

Id	Grade	Path(s)	Details	Requirements
cnl-0	warning	EvidenceVariable	Name should be usable as an identifier for the module by machine processing applications such as code generation : name.exists() implies name.matches('^[A-Z]([A-Za-z0-9_]){1,254}$')
cnl-1	warning	EvidenceVariable.url	URL should not contain | or # - these characters make processing canonical references problematic : exists() implies matches('^[^|# ]+$')
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()

This structure is derived from VariableDefinition

Summary

Mandatory: 1 element(1 nested mandatory element)

Maturity: 1

Other representations of profile: CSV, Excel, Schematron