description: This cross-version extension represents EvidenceVariable.approvalDate from http://hl7.org/fhir/StructureDefinition/EvidenceVariable|4.0.1 for use in FHIR R4B. package_name: hl7.fhir.uv.xver-r4.r4b derivation: constraint name: ext_R4_EvidenceVariable_approvalDate type: Extension elements: value: base: {path: 'Extension.value[x]'} short: When the evidence variable was approved by publisher choices: [valueDate] index: 1 valueDate: base: {path: 'Extension.value[x]'} type: date short: When the evidence variable was approved by publisher choiceOf: value index: 2 url: pattern: {type: uri, value: 'http://hl7.org/fhir/4.0/StructureDefinition/extension-EvidenceVariable.approvalDate'} type: uri index: 3 package_version: 0.0.1-snapshot-1 class: extension kind: complex-type url: http://hl7.org/fhir/4.0/StructureDefinition/extension-EvidenceVariable.approvalDate base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.0.1-snapshot-1 required: [url]