description: This cross-version extension represents Immunization.notGiven from http://hl7.org/fhir/StructureDefinition/Immunization|3.0.2 for use in FHIR R4B. package_name: hl7.fhir.uv.xver derivation: constraint name: ext_R3_Immunization_notGiven type: Extension elements: value: base: {path: 'Extension.value[x]'} short: Flag for whether immunization was given choices: [valueBoolean] index: 1 valueBoolean: base: {path: 'Extension.value[x]'} type: boolean short: Flag for whether immunization was given choiceOf: value index: 2 url: pattern: {type: Uri, value: 'http://hl7.org/fhir/3.0/StructureDefinition/extension-Immunization.notGiven'} index: 3 package_version: r3.r4b-0.0.1-snapshot-1 class: extension kind: complex-type url: http://hl7.org/fhir/3.0/StructureDefinition/extension-Immunization.notGiven base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.0.1-snapshot-1 required: [url]