description: This cross-version extension represents ImagingStudy.uid from http://hl7.org/fhir/StructureDefinition/ImagingStudy|3.0.2 for use in FHIR R4. package_name: hl7.fhir.uv.xver-r3.r4 derivation: constraint name: ext_R3_ImagingStudy_uid type: Extension elements: value: base: {path: 'Extension.value[x]'} short: Formal DICOM identifier for the study choices: [valueOid] index: 1 valueOid: base: {path: 'Extension.value[x]'} type: oid short: Formal DICOM identifier for the study choiceOf: value index: 2 url: pattern: {type: Uri, value: 'http://hl7.org/fhir/3.0/StructureDefinition/extension-ImagingStudy.uid'} index: 3 package_version: 0.0.1-snapshot-1 class: extension kind: complex-type url: http://hl7.org/fhir/3.0/StructureDefinition/extension-ImagingStudy.uid base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.0.1-snapshot-1 required: [url]