description: If present and true, indicates that the item establishes a different subject for the group in a response. package_name: hl7.fhir.uv.sdc.r4b derivation: constraint name: IsSubjectExtension type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-isSubject'} index: 1 value: choices: [valueBoolean] index: 3 valueBoolean: {type: boolean, choiceOf: value, index: 4} package_version: 4.0.0-ballot extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-isSubject base: http://hl7.org/fhir/StructureDefinition/Extension version: 4.0.0-ballot