Generated Narrative: StructureDefinition ext-R5-ResearchStudy.comparisonGroup

NameFlagsCard.TypeDescription & Constraintsdoco
.. Extension 0..*Extension(4.3.0)Defined path through the study for a subject
... Slices for extension 1..*ExtensionExtension
Slice: Unordered, Closed by value:url
.... extension:linkId 0..1ExtensionAllows the comparisonGroup for the study and the comparisonGroup for the subject to be linked easily
..... url 1..1uri"linkId"
..... value[x] 0..1idAllows the comparisonGroup for the study and the comparisonGroup for the subject to be linked easily
.... extension:name 1..1ExtensionLabel for study comparisonGroup
..... url 1..1uri"name"
..... value[x] 0..1stringLabel for study comparisonGroup
.... extension:type 0..1ExtensionCategorization of study comparisonGroup
..... url 1..1uri"type"
..... value[x] 0..1CodeableConceptCategorization of study comparisonGroup
Binding: R5_research_study_arm_type_for_R4B (0.0.1-snapshot-2) (extensible): desc.
.... extension:description 0..1ExtensionShort explanation of study path
..... url 1..1uri"description"
..... value[x] 0..1markdownShort explanation of study path
.... extension:intendedExposure 0..*ExtensionInterventions or exposures in this comparisonGroup or cohort
..... url 1..1uri"intendedExposure"
..... value[x] 0..1Reference()Interventions or exposures in this comparisonGroup or cohort
.... extension:observedGroup 0..1ExtensionGroup of participants who were enrolled in study comparisonGroup
..... url 1..1uri"observedGroup"
..... value[x] 0..1Reference()Group of participants who were enrolled in study comparisonGroup
... url 1..1uri"http://hl7.org/fhir/5.0/StructureDefinition/extension-ResearchStudy.comparisonGroup"

doco Documentation for this format
 <status value="active"/> <experimental value="false"/> <date value="2025-09-01T22:37:24.688712+10:00"/> <publisher value="FHIR Infrastructure"/> <contact> <name value="FHIR Infrastructure"/> <telecom> <system value="url"/> <value value="http://www.hl7.org/Special/committees/fiwg"/> </telecom> </contact> <description value="This cross-version extension represents ResearchStudy.comparisonGroup from http://hl7.org/fhir/StructureDefinition/ResearchStudy|5.0.0 for use in FHIR R4B."/> <jurisdiction> <coding> <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/> <code value="001"/> <display value="World"/> </coding> </jurisdiction> <fhirVersion value="4.3.0"/> <mapping> <identity value="rim"/> <uri value="http://hl7.org/v3"/> <name value="RIM Mapping"/> </mapping> <kind value="complex-type"/> <abstract value="false"/> <context> <type value="element"/> <expression value="ResearchStudy"/> </context> <type value="Extension"/> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension|4.3.0"/> <derivation value="constraint"/> <snapshot> <extension url="http://hl7.org/fhir/tools/StructureDefinition/snapshot-base-version"> <valueString value="4.3.0"/> </extension> <element id="Extension"> <path value="Extension"/> <short value="Defined path through the study for a subject"/> <definition value="Describes an expected event or sequence of events for one of the subjects of a study. E.g. for a living subject: exposure to drug A, wash-out, exposure to drug B, wash-out, follow-up. E.g. for a stability study: {store sample from lot A at 25 degrees for 1 month}, {store sample from lot A at 40 degrees for 1 month}."/> <comment value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <min value="0"/> <max value="*"/> <base> <path value="Extension"/> <min value="0"/> <max value="*"/> </base> <condition value="ele-1"/> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children unless an empty Parameters resource"/> <expression value="hasValue() or (children().count() > id.count()) or $this is Parameters"/> <xpath value="@value|f:*|h:div|self::f:Parameters"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <constraint> <key value="ext-1"/> <severity value="error"/> <human value="Must have either extensions or value[x], not both"/> <expression value="extension.exists() != value.exists()"/> <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/> <source value="http://hl7.org/fhir/StructureDefinition/Extension|4.3.0"/> </constraint> <isModifier value="false"/> </element> <element id="Extension.id"> <path value="Extension.id"/> <representation value="xmlAttr"/> <short value="Unique id for inter-element referencing"/> <definition value="Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/> <min value="0"/> <max value="1"/> <base> <path value="Element.id"/> <min value="0"/> <max value="1"/> </base> <type> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"> <valueUrl value="id"/> </extension> <code value="http://hl7.org/fhirpath/System.String"/> </type> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="n/a"/> </mapping> </element> <element id="Extension.extension"> <path value="Extension.extension"/> <slicing> <discriminator> <type value="value"/> <path value="url"/> </discriminator> <description value="Extensions are always sliced by (at least) url"/> <ordered value="false"/> <rules value="closed"/> </slicing> <short value="Extension"/> <definition value="An Extension"/> <min value="1"/> <max value="*"/> <base> <path value="Element.extension"/> <min value="0"/> <max value="*"/> </base> <type> <code value="Extension"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <xpath value="@value|f:*|h:div"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <constraint> <key value="ext-1"/> <severity value="error"/> <human value="Must have either extensions or value[x], not both"/> <expression value="extension.exists() != value.exists()"/> <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), "value")])"/> <source value="http://hl7.org/fhir/StructureDefinition/Extension|4.3.0"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> </element> <element id="Extension.extension:linkId"> <path value="Extension.extension"/> <sliceName value="linkId"/> <short value="Allows the comparisonGroup for the study and the comparisonGroup for the subject to be linked easily"/> <definition value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <min value="0"/> <max value="1"/> <base> <path value="Element.extension"/> <min value="0"/> <max value="*"/> </base> <type> <code value="Extension"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <xpath value="@value|f:*|h:div"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <constraint> <key value="ext-1"/> <severity value="error"/> <human value="Must have either extensions or value[x], not both"/> <expression value="extension.exists() != value.exists()"/> <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), "value")])"/> <source value="http://hl7.org/fhir/StructureDefinition/Extension|4.3.0"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> </element> <element id="Extension.extension:linkId.id"> <path value="Extension.extension.id"/> <representation value="xmlAttr"/> <short value="Unique id for inter-element referencing"/> <definition value="Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/> <min value="0"/> <max value="1"/> <base> <path value="Element.id"/> <min value="0"/> <max value="1"/> </base> <type> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"> <valueUrl value="id"/> </extension> <code value="http://hl7.org/fhirpath/System.String"/> </type> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="n/a"/> </mapping> </element> <element id="Extension.extension:linkId.extension"> <path value="Extension.extension.extension"/> <slicing> <discriminator> <type value="value"/> <path value="url"/> </discriminator> <description value="Extensions are always sliced by (at least) url"/> <rules value="open"/> </slicing> <short value="Additional content defined by implementations"/> <definition value="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."/> <comment value="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."/> <alias value="extensions"/> <alias value="user content"/> <min value="0"/> <max value="*"/> <base> <path value="Element.extension"/> <min value="0"/> <max value="*"/> </base> <type> <code value="Extension"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <xpath value="@value|f:*|h:div"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <constraint> <key value="ext-1"/> <severity value="error"/> <human value="Must have either extensions or value[x], not both"/> <expression value="extension.exists() != value.exists()"/> <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), "value")])"/> <source value="http://hl7.org/fhir/StructureDefinition/Extension|4.3.0"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="n/a"/> </mapping> </element> <element id="Extension.extension:linkId.url"> <path value="Extension.extension.url"/> <representation value="xmlAttr"/> <short value="identifies the meaning of the extension"/> <definition value="Source of the definition for the extension code - a logical name or a URL."/> <comment value="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."/> <min value="1"/> <max value="1"/> <base> <path value="Extension.url"/> <min value="1"/> <max value="1"/> </base> <type> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"> <valueUrl value="uri"/> </extension> <code value="http://hl7.org/fhirpath/System.String"/> </type> <fixedUri value="linkId"/> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="N/A"/> </mapping> </element> <element id="Extension.extension:linkId.value[x]"> <path value="Extension.extension.value[x]"/> <short value="Allows the comparisonGroup for the study and the comparisonGroup for the subject to be linked easily"/> <definition value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <min value="0"/> <max value="1"/> <base> <path value="Extension.value[x]"/> <min value="0"/> <max value="1"/> </base> <type> <code value="id"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <xpath value="@value|f:*|h:div"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="N/A"/> </mapping> </element> <element id="Extension.extension:name"> <path value="Extension.extension"/> <sliceName value="name"/> <short value="Label for study comparisonGroup"/> <definition value="Unique, human-readable label for this comparisonGroup of the study."/> <comment value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <min value="1"/> <max value="1"/> <base> <path value="Element.extension"/> <min value="0"/> <max value="*"/> </base> <type> <code value="Extension"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <xpath value="@value|f:*|h:div"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <constraint> <key value="ext-1"/> <severity value="error"/> <human value="Must have either extensions or value[x], not both"/> <expression value="extension.exists() != value.exists()"/> <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), "value")])"/> <source value="http://hl7.org/fhir/StructureDefinition/Extension|4.3.0"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> </element> <element id="Extension.extension:name.id"> <path value="Extension.extension.id"/> <representation value="xmlAttr"/> <short value="Unique id for inter-element referencing"/> <definition value="Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/> <min value="0"/> <max value="1"/> <base> <path value="Element.id"/> <min value="0"/> <max value="1"/> </base> <type> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"> <valueUrl value="id"/> </extension> <code value="http://hl7.org/fhirpath/System.String"/> </type> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="n/a"/> </mapping> </element> <element id="Extension.extension:name.extension"> <path value="Extension.extension.extension"/> <slicing> <discriminator> <type value="value"/> <path value="url"/> </discriminator> <description value="Extensions are always sliced by (at least) url"/> <rules value="open"/> </slicing> <short value="Additional content defined by implementations"/> <definition value="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."/> <comment value="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."/> <alias value="extensions"/> <alias value="user content"/> <min value="0"/> <max value="*"/> <base> <path value="Element.extension"/> <min value="0"/> <max value="*"/> </base> <type> <code value="Extension"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <xpath value="@value|f:*|h:div"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <constraint> <key value="ext-1"/> <severity value="error"/> <human value="Must have either extensions or value[x], not both"/> <expression value="extension.exists() != value.exists()"/> <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), "value")])"/> <source value="http://hl7.org/fhir/StructureDefinition/Extension|4.3.0"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="n/a"/> </mapping> </element> <element id="Extension.extension:name.url"> <path value="Extension.extension.url"/> <representation value="xmlAttr"/> <short value="identifies the meaning of the extension"/> <definition value="Source of the definition for the extension code - a logical name or a URL."/> <comment value="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."/> <min value="1"/> <max value="1"/> <base> <path value="Extension.url"/> <min value="1"/> <max value="1"/> </base> <type> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"> <valueUrl value="uri"/> </extension> <code value="http://hl7.org/fhirpath/System.String"/> </type> <fixedUri value="name"/> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="N/A"/> </mapping> </element> <element id="Extension.extension:name.value[x]"> <path value="Extension.extension.value[x]"/> <short value="Label for study comparisonGroup"/> <definition value="Unique, human-readable label for this comparisonGroup of the study."/> <comment value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <min value="0"/> <max value="1"/> <base> <path value="Extension.value[x]"/> <min value="0"/> <max value="1"/> </base> <type> <code value="string"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <xpath value="@value|f:*|h:div"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="N/A"/> </mapping> </element> <element id="Extension.extension:type"> <path value="Extension.extension"/> <sliceName value="type"/> <short value="Categorization of study comparisonGroup"/> <definition value="Categorization of study comparisonGroup, e.g. experimental, active comparator, placebo comparater."/> <comment value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <min value="0"/> <max value="1"/> <base> <path value="Element.extension"/> <min value="0"/> <max value="*"/> </base> <type> <code value="Extension"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <xpath value="@value|f:*|h:div"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <constraint> <key value="ext-1"/> <severity value="error"/> <human value="Must have either extensions or value[x], not both"/> <expression value="extension.exists() != value.exists()"/> <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), "value")])"/> <source value="http://hl7.org/fhir/StructureDefinition/Extension|4.3.0"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> </element> <element id="Extension.extension:type.id"> <path value="Extension.extension.id"/> <representation value="xmlAttr"/> <short value="Unique id for inter-element referencing"/> <definition value="Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/> <min value="0"/> <max value="1"/> <base> <path value="Element.id"/> <min value="0"/> <max value="1"/> </base> <type> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"> <valueUrl value="id"/> </extension> <code value="http://hl7.org/fhirpath/System.String"/> </type> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="n/a"/> </mapping> </element> <element id="Extension.extension:type.extension"> <path value="Extension.extension.extension"/> <slicing> <discriminator> <type value="value"/> <path value="url"/> </discriminator> <description value="Extensions are always sliced by (at least) url"/> <rules value="open"/> </slicing> <short value="Additional content defined by implementations"/> <definition value="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."/> <comment value="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."/> <alias value="extensions"/> <alias value="user content"/> <min value="0"/> <max value="*"/> <base> <path value="Element.extension"/> <min value="0"/> <max value="*"/> </base> <type> <code value="Extension"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <xpath value="@value|f:*|h:div"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <constraint> <key value="ext-1"/> <severity value="error"/> <human value="Must have either extensions or value[x], not both"/> <expression value="extension.exists() != value.exists()"/> <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), "value")])"/> <source value="http://hl7.org/fhir/StructureDefinition/Extension|4.3.0"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="n/a"/> </mapping> </element> <element id="Extension.extension:type.url"> <path value="Extension.extension.url"/> <representation value="xmlAttr"/> <short value="identifies the meaning of the extension"/> <definition value="Source of the definition for the extension code - a logical name or a URL."/> <comment value="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."/> <min value="1"/> <max value="1"/> <base> <path value="Extension.url"/> <min value="1"/> <max value="1"/> </base> <type> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"> <valueUrl value="uri"/> </extension> <code value="http://hl7.org/fhirpath/System.String"/> </type> <fixedUri value="type"/> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="N/A"/> </mapping> </element> <element id="Extension.extension:type.value[x]"> <path value="Extension.extension.value[x]"/> <short value="Categorization of study comparisonGroup"/> <definition value="Categorization of study comparisonGroup, e.g. experimental, active comparator, placebo comparater."/> <comment value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <min value="0"/> <max value="1"/> <base> <path value="Extension.value[x]"/> <min value="0"/> <max value="1"/> </base> <type> <code value="CodeableConcept"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <xpath value="@value|f:*|h:div"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> <binding> <strength value="extensible"/> <description value="desc."/> <valueSet value="http://hl7.org/fhir/5.0/ValueSet/R5-research-study-arm-type-for-R4B|0.0.1-snapshot-2"/> </binding> <mapping> <identity value="rim"/> <map value="N/A"/> </mapping> </element> <element id="Extension.extension:description"> <path value="Extension.extension"/> <sliceName value="description"/> <short value="Short explanation of study path"/> <definition value="A succinct description of the path through the study that would be followed by a subject adhering to this comparisonGroup."/> <comment value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <min value="0"/> <max value="1"/> <base> <path value="Element.extension"/> <min value="0"/> <max value="*"/> </base> <type> <code value="Extension"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <xpath value="@value|f:*|h:div"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <constraint> <key value="ext-1"/> <severity value="error"/> <human value="Must have either extensions or value[x], not both"/> <expression value="extension.exists() != value.exists()"/> <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), "value")])"/> <source value="http://hl7.org/fhir/StructureDefinition/Extension|4.3.0"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> </element> <element id="Extension.extension:description.id"> <path value="Extension.extension.id"/> <representation value="xmlAttr"/> <short value="Unique id for inter-element referencing"/> <definition value="Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/> <min value="0"/> <max value="1"/> <base> <path value="Element.id"/> <min value="0"/> <max value="1"/> </base> <type> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"> <valueUrl value="id"/> </extension> <code value="http://hl7.org/fhirpath/System.String"/> </type> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="n/a"/> </mapping> </element> <element id="Extension.extension:description.extension"> <path value="Extension.extension.extension"/> <slicing> <discriminator> <type value="value"/> <path value="url"/> </discriminator> <description value="Extensions are always sliced by (at least) url"/> <rules value="open"/> </slicing> <short value="Additional content defined by implementations"/> <definition value="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."/> <comment value="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."/> <alias value="extensions"/> <alias value="user content"/> <min value="0"/> <max value="*"/> <base> <path value="Element.extension"/> <min value="0"/> <max value="*"/> </base> <type> <code value="Extension"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <xpath value="@value|f:*|h:div"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <constraint> <key value="ext-1"/> <severity value="error"/> <human value="Must have either extensions or value[x], not both"/> <expression value="extension.exists() != value.exists()"/> <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), "value")])"/> <source value="http://hl7.org/fhir/StructureDefinition/Extension|4.3.0"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="n/a"/> </mapping> </element> <element id="Extension.extension:description.url"> <path value="Extension.extension.url"/> <representation value="xmlAttr"/> <short value="identifies the meaning of the extension"/> <definition value="Source of the definition for the extension code - a logical name or a URL."/> <comment value="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."/> <min value="1"/> <max value="1"/> <base> <path value="Extension.url"/> <min value="1"/> <max value="1"/> </base> <type> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"> <valueUrl value="uri"/> </extension> <code value="http://hl7.org/fhirpath/System.String"/> </type> <fixedUri value="description"/> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="N/A"/> </mapping> </element> <element id="Extension.extension:description.value[x]"> <path value="Extension.extension.value[x]"/> <short value="Short explanation of study path"/> <definition value="A succinct description of the path through the study that would be followed by a subject adhering to this comparisonGroup."/> <comment value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <min value="0"/> <max value="1"/> <base> <path value="Extension.value[x]"/> <min value="0"/> <max value="1"/> </base> <type> <code value="markdown"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <xpath value="@value|f:*|h:div"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="N/A"/> </mapping> </element> <element id="Extension.extension:intendedExposure"> <path value="Extension.extension"/> <sliceName value="intendedExposure"/> <short value="Interventions or exposures in this comparisonGroup or cohort"/> <definition value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <min value="0"/> <max value="*"/> <base> <path value="Element.extension"/> <min value="0"/> <max value="*"/> </base> <type> <code value="Extension"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <xpath value="@value|f:*|h:div"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <constraint> <key value="ext-1"/> <severity value="error"/> <human value="Must have either extensions or value[x], not both"/> <expression value="extension.exists() != value.exists()"/> <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), "value")])"/> <source value="http://hl7.org/fhir/StructureDefinition/Extension|4.3.0"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> </element> <element id="Extension.extension:intendedExposure.id"> <path value="Extension.extension.id"/> <representation value="xmlAttr"/> <short value="Unique id for inter-element referencing"/> <definition value="Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/> <min value="0"/> <max value="1"/> <base> <path value="Element.id"/> <min value="0"/> <max value="1"/> </base> <type> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"> <valueUrl value="id"/> </extension> <code value="http://hl7.org/fhirpath/System.String"/> </type> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="n/a"/> </mapping> </element> <element id="Extension.extension:intendedExposure.extension"> <path value="Extension.extension.extension"/> <slicing> <discriminator> <type value="value"/> <path value="url"/> </discriminator> <description value="Extensions are always sliced by (at least) url"/> <rules value="open"/> </slicing> <short value="Additional content defined by implementations"/> <definition value="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."/> <comment value="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."/> <alias value="extensions"/> <alias value="user content"/> <min value="0"/> <max value="*"/> <base> <path value="Element.extension"/> <min value="0"/> <max value="*"/> </base> <type> <code value="Extension"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <xpath value="@value|f:*|h:div"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <constraint> <key value="ext-1"/> <severity value="error"/> <human value="Must have either extensions or value[x], not both"/> <expression value="extension.exists() != value.exists()"/> <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), "value")])"/> <source value="http://hl7.org/fhir/StructureDefinition/Extension|4.3.0"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="n/a"/> </mapping> </element> <element id="Extension.extension:intendedExposure.url"> <path value="Extension.extension.url"/> <representation value="xmlAttr"/> <short value="identifies the meaning of the extension"/> <definition value="Source of the definition for the extension code - a logical name or a URL."/> <comment value="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."/> <min value="1"/> <max value="1"/> <base> <path value="Extension.url"/> <min value="1"/> <max value="1"/> </base> <type> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"> <valueUrl value="uri"/> </extension> <code value="http://hl7.org/fhirpath/System.String"/> </type> <fixedUri value="intendedExposure"/> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="N/A"/> </mapping> </element> <element id="Extension.extension:intendedExposure.value[x]"> <path value="Extension.extension.value[x]"/> <short value="Interventions or exposures in this comparisonGroup or cohort"/> <definition value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <min value="0"/> <max value="1"/> <base> <path value="Extension.value[x]"/> <min value="0"/> <max value="1"/> </base> <type> <code value="Reference"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <xpath value="@value|f:*|h:div"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="N/A"/> </mapping> </element> <element id="Extension.extension:observedGroup"> <path value="Extension.extension"/> <sliceName value="observedGroup"/> <short value="Group of participants who were enrolled in study comparisonGroup"/> <definition value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <min value="0"/> <max value="1"/> <base> <path value="Element.extension"/> <min value="0"/> <max value="*"/> </base> <type> <code value="Extension"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <xpath value="@value|f:*|h:div"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <constraint> <key value="ext-1"/> <severity value="error"/> <human value="Must have either extensions or value[x], not both"/> <expression value="extension.exists() != value.exists()"/> <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), "value")])"/> <source value="http://hl7.org/fhir/StructureDefinition/Extension|4.3.0"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> </element> <element id="Extension.extension:observedGroup.id"> <path value="Extension.extension.id"/> <representation value="xmlAttr"/> <short value="Unique id for inter-element referencing"/> <definition value="Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/> <min value="0"/> <max value="1"/> <base> <path value="Element.id"/> <min value="0"/> <max value="1"/> </base> <type> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"> <valueUrl value="id"/> </extension> <code value="http://hl7.org/fhirpath/System.String"/> </type> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="n/a"/> </mapping> </element> <element id="Extension.extension:observedGroup.extension"> <path value="Extension.extension.extension"/> <slicing> <discriminator> <type value="value"/> <path value="url"/> </discriminator> <description value="Extensions are always sliced by (at least) url"/> <rules value="open"/> </slicing> <short value="Additional content defined by implementations"/> <definition value="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."/> <comment value="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."/> <alias value="extensions"/> <alias value="user content"/> <min value="0"/> <max value="*"/> <base> <path value="Element.extension"/> <min value="0"/> <max value="*"/> </base> <type> <code value="Extension"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <xpath value="@value|f:*|h:div"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <constraint> <key value="ext-1"/> <severity value="error"/> <human value="Must have either extensions or value[x], not both"/> <expression value="extension.exists() != value.exists()"/> <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), "value")])"/> <source value="http://hl7.org/fhir/StructureDefinition/Extension|4.3.0"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="n/a"/> </mapping> </element> <element id="Extension.extension:observedGroup.url"> <path value="Extension.extension.url"/> <representation value="xmlAttr"/> <short value="identifies the meaning of the extension"/> <definition value="Source of the definition for the extension code - a logical name or a URL."/> <comment value="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."/> <min value="1"/> <max value="1"/> <base> <path value="Extension.url"/> <min value="1"/> <max value="1"/> </base> <type> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"> <valueUrl value="uri"/> </extension> <code value="http://hl7.org/fhirpath/System.String"/> </type> <fixedUri value="observedGroup"/> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="N/A"/> </mapping> </element> <element id="Extension.extension:observedGroup.value[x]"> <path value="Extension.extension.value[x]"/> <short value="Group of participants who were enrolled in study comparisonGroup"/> <definition value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <min value="0"/> <max value="1"/> <base> <path value="Extension.value[x]"/> <min value="0"/> <max value="1"/> </base> <type> <code value="Reference"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <xpath value="@value|f:*|h:div"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="N/A"/> </mapping> </element> <element id="Extension.url"> <path value="Extension.url"/> <representation value="xmlAttr"/> <short value="identifies the meaning of the extension"/> <definition value="Source of the definition for the extension code - a logical name or a URL."/> <comment value="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."/> <min value="1"/> <max value="1"/> <base> <path value="Extension.url"/> <min value="1"/> <max value="1"/> </base> <type> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type"> <valueUrl value="uri"/> </extension> <code value="http://hl7.org/fhirpath/System.String"/> </type> <fixedUri value="http://hl7.org/fhir/5.0/StructureDefinition/extension-ResearchStudy.comparisonGroup"/> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="N/A"/> </mapping> </element> <element id="Extension.value[x]"> <path value="Extension.value[x]"/> <short value="Value of extension"/> <definition value="Value of extension - must be one of a constrained set of the data types (see [Extensibility](http://hl7.org/fhir/R4B/extensibility.html) for a list)."/> <min value="0"/> <max value="1"/> <base> <path value="Extension.value[x]"/> <min value="0"/> <max value="1"/> </base> <type> <code value="base64Binary"/> </type> <type> <code value="boolean"/> </type> <type> <code value="canonical"/> </type> <type> <code value="code"/> </type> <type> <code value="date"/> </type> <type> <code value="dateTime"/> </type> <type> <code value="decimal"/> </type> <type> <code value="id"/> </type> <type> <code value="instant"/> </type> <type> <code value="integer"/> </type> <type> <code value="markdown"/> </type> <type> <code value="oid"/> </type> <type> <code value="positiveInt"/> </type> <type> <code value="string"/> </type> <type> <code value="time"/> </type> <type> <code value="unsignedInt"/> </type> <type> <code value="uri"/> </type> <type> <code value="url"/> </type> <type> <code value="uuid"/> </type> <type> <code value="Address"/> </type> <type> <code value="Age"/> </type> <type> <code value="Annotation"/> </type> <type> <code value="Attachment"/> </type> <type> <code value="CodeableConcept"/> </type> <type> <code value="CodeableReference"/> </type> <type> <code value="Coding"/> </type> <type> <code value="ContactPoint"/> </type> <type> <code value="Count"/> </type> <type> <code value="Distance"/> </type> <type> <code value="Duration"/> </type> <type> <code value="HumanName"/> </type> <type> <code value="Identifier"/> </type> <type> <code value="Money"/> </type> <type> <code value="Period"/> </type> <type> <code value="Quantity"/> </type> <type> <code value="Range"/> </type> <type> <code value="Ratio"/> </type> <type> <code value="RatioRange"/> </type> <type> <code value="Reference"/> </type> <type> <code value="SampledData"/> </type> <type> <code value="Signature"/> </type> <type> <code value="Timing"/> </type> <type> <code value="ContactDetail"/> </type> <type> <code value="Contributor"/> </type> <type> <code value="DataRequirement"/> </type> <type> <code value="Expression"/> </type> <type> <code value="ParameterDefinition"/> </type> <type> <code value="RelatedArtifact"/> </type> <type> <code value="TriggerDefinition"/> </type> <type> <code value="UsageContext"/> </type> <type> <code value="Dosage"/> </type> <constraint> <key value="ele-1"/> <severity value="error"/> <human value="All FHIR elements must have a @value or children"/> <expression value="hasValue() or (children().count() > id.count())"/> <xpath value="@value|f:*|h:div"/> <source value="http://hl7.org/fhir/StructureDefinition/Element|4.3.0"/> </constraint> <isModifier value="false"/> <isSummary value="false"/> <mapping> <identity value="rim"/> <map value="N/A"/> </mapping> </element> </snapshot> <differential> <element id="Extension"> <path value="Extension"/> <short value="Defined path through the study for a subject"/> <definition value="Describes an expected event or sequence of events for one of the subjects of a study. E.g. for a living subject: exposure to drug A, wash-out, exposure to drug B, wash-out, follow-up. E.g. for a stability study: {store sample from lot A at 25 degrees for 1 month}, {store sample from lot A at 40 degrees for 1 month}."/> <comment value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <min value="0"/> <max value="*"/> <base> <path value="Extension"/> <min value="0"/> <max value="*"/> </base> </element> <element id="Extension.extension"> <path value="Extension.extension"/> <slicing> <discriminator> <type value="value"/> <path value="url"/> </discriminator> <ordered value="false"/> <rules value="closed"/> </slicing> <min value="1"/> <max value="*"/> <base> <path value="Extension.extension"/> <min value="0"/> <max value="*"/> </base> </element> <element id="Extension.extension:linkId"> <path value="Extension.extension"/> <sliceName value="linkId"/> <short value="Allows the comparisonGroup for the study and the comparisonGroup for the subject to be linked easily"/> <definition value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <min value="0"/> <max value="1"/> <base> <path value="Extension.extension"/> <min value="0"/> <max value="*"/> </base> </element> <element id="Extension.extension:linkId.url"> <path value="Extension.extension.url"/> <min value="1"/> <max value="1"/> <base> <path value="Extension.url"/> <min value="1"/> <max value="1"/> </base> <fixedUri value="linkId"/> </element> <element id="Extension.extension:linkId.value[x]"> <path value="Extension.extension.value[x]"/> <short value="Allows the comparisonGroup for the study and the comparisonGroup for the subject to be linked easily"/> <definition value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <base> <path value="Extension.value[x]"/> <min value="0"/> <max value="1"/> </base> <type> <code value="id"/> </type> </element> <element id="Extension.extension:name"> <path value="Extension.extension"/> <sliceName value="name"/> <short value="Label for study comparisonGroup"/> <definition value="Unique, human-readable label for this comparisonGroup of the study."/> <comment value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <min value="1"/> <max value="1"/> <base> <path value="Extension.extension"/> <min value="0"/> <max value="*"/> </base> </element> <element id="Extension.extension:name.url"> <path value="Extension.extension.url"/> <min value="1"/> <max value="1"/> <base> <path value="Extension.url"/> <min value="1"/> <max value="1"/> </base> <fixedUri value="name"/> </element> <element id="Extension.extension:name.value[x]"> <path value="Extension.extension.value[x]"/> <short value="Label for study comparisonGroup"/> <definition value="Unique, human-readable label for this comparisonGroup of the study."/> <comment value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <base> <path value="Extension.value[x]"/> <min value="0"/> <max value="1"/> </base> <type> <code value="string"/> </type> </element> <element id="Extension.extension:type"> <path value="Extension.extension"/> <sliceName value="type"/> <short value="Categorization of study comparisonGroup"/> <definition value="Categorization of study comparisonGroup, e.g. experimental, active comparator, placebo comparater."/> <comment value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <min value="0"/> <max value="1"/> <base> <path value="Extension.extension"/> <min value="0"/> <max value="*"/> </base> </element> <element id="Extension.extension:type.url"> <path value="Extension.extension.url"/> <min value="1"/> <max value="1"/> <base> <path value="Extension.url"/> <min value="1"/> <max value="1"/> </base> <fixedUri value="type"/> </element> <element id="Extension.extension:type.value[x]"> <path value="Extension.extension.value[x]"/> <short value="Categorization of study comparisonGroup"/> <definition value="Categorization of study comparisonGroup, e.g. experimental, active comparator, placebo comparater."/> <comment value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <base> <path value="Extension.value[x]"/> <min value="0"/> <max value="1"/> </base> <type> <code value="CodeableConcept"/> </type> <binding> <strength value="extensible"/> <description value="desc."/> <valueSet value="http://hl7.org/fhir/5.0/ValueSet/R5-research-study-arm-type-for-R4B|0.0.1-snapshot-2"/> </binding> </element> <element id="Extension.extension:description"> <path value="Extension.extension"/> <sliceName value="description"/> <short value="Short explanation of study path"/> <definition value="A succinct description of the path through the study that would be followed by a subject adhering to this comparisonGroup."/> <comment value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <min value="0"/> <max value="1"/> <base> <path value="Extension.extension"/> <min value="0"/> <max value="*"/> </base> </element> <element id="Extension.extension:description.url"> <path value="Extension.extension.url"/> <min value="1"/> <max value="1"/> <base> <path value="Extension.url"/> <min value="1"/> <max value="1"/> </base> <fixedUri value="description"/> </element> <element id="Extension.extension:description.value[x]"> <path value="Extension.extension.value[x]"/> <short value="Short explanation of study path"/> <definition value="A succinct description of the path through the study that would be followed by a subject adhering to this comparisonGroup."/> <comment value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <base> <path value="Extension.value[x]"/> <min value="0"/> <max value="1"/> </base> <type> <code value="markdown"/> </type> </element> <element id="Extension.extension:intendedExposure"> <path value="Extension.extension"/> <sliceName value="intendedExposure"/> <short value="Interventions or exposures in this comparisonGroup or cohort"/> <definition value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <min value="0"/> <max value="*"/> <base> <path value="Extension.extension"/> <min value="0"/> <max value="*"/> </base> </element> <element id="Extension.extension:intendedExposure.url"> <path value="Extension.extension.url"/> <min value="1"/> <max value="1"/> <base> <path value="Extension.url"/> <min value="1"/> <max value="1"/> </base> <fixedUri value="intendedExposure"/> </element> <element id="Extension.extension:intendedExposure.value[x]"> <path value="Extension.extension.value[x]"/> <short value="Interventions or exposures in this comparisonGroup or cohort"/> <definition value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <base> <path value="Extension.value[x]"/> <min value="0"/> <max value="1"/> </base> <type> <code value="Reference"/> </type> </element> <element id="Extension.extension:observedGroup"> <path value="Extension.extension"/> <sliceName value="observedGroup"/> <short value="Group of participants who were enrolled in study comparisonGroup"/> <definition value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <min value="0"/> <max value="1"/> <base> <path value="Extension.extension"/> <min value="0"/> <max value="*"/> </base> </element> <element id="Extension.extension:observedGroup.url"> <path value="Extension.extension.url"/> <min value="1"/> <max value="1"/> <base> <path value="Extension.url"/> <min value="1"/> <max value="1"/> </base> <fixedUri value="observedGroup"/> </element> <element id="Extension.extension:observedGroup.value[x]"> <path value="Extension.extension.value[x]"/> <short value="Group of participants who were enrolled in study comparisonGroup"/> <definition value="`ResearchStudy.comparisonGroup` has no related element in R4B:ResearchStudy"/> <base> <path value="Extension.value[x]"/> <min value="0"/> <max value="1"/> </base> <type> <code value="Reference"/> </type> </element> <element id="Extension.url"> <path value="Extension.url"/> <min value="1"/> <max value="1"/> <base> <path value="Extension.url"/> <min value="1"/> <max value="1"/> </base> <fixedUri value="http://hl7.org/fhir/5.0/StructureDefinition/extension-ResearchStudy.comparisonGroup"/> </element> </differential> </StructureDefinition>