description: This cross-version extension represents RequestGroup.subject from http://hl7.org/fhir/StructureDefinition/RequestGroup|4.3.0 for use in FHIR R5. package_name: rs/hl7.fhir.uv.xver derivation: constraint name: ext_R4B_RequestGroup_subject type: Extension elements: url: pattern: {type: uri, value: 'http://hl7.org/fhir/4.3/StructureDefinition/extension-RequestGroup.subject'} type: uri index: 0 package_version: r4b.r5-0.0.1-snapshot-1 class: extension kind: complex-type url: http://hl7.org/fhir/4.3/StructureDefinition/extension-RequestGroup.subject base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.0.1-snapshot-1 required: [url]