description: This cross-version extension represents Specimen.subject from http://hl7.org/fhir/StructureDefinition/Specimen|3.0.2 for use in FHIR R5. package_name: hl7.fhir.uv.xver-r3.r5 derivation: constraint name: ext_R3_Specimen_subject type: Extension elements: url: pattern: {type: Uri, value: 'http://hl7.org/fhir/3.0/StructureDefinition/extension-Specimen.subject'} index: 0 package_version: 0.0.1-snapshot-1 class: extension kind: complex-type url: http://hl7.org/fhir/3.0/StructureDefinition/extension-Specimen.subject base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.0.1-snapshot-1 required: [url]