description: null package_name: fhir.r4.wales.stu1 derivation: constraint name: ExtensionDataStandardsWalesSingleRecordAllergiesListUpdated type: Extension elements: url: pattern: {type: uri, value: 'https://example.org/fhir/StructureDefinition/Extension-DataStandardsWales-SingleRecordAllergiesListUpdated'} type: uri index: 0 value: choices: [valueBoolean] index: 2 valueBoolean: {type: boolean, choiceOf: value, index: 3} package_version: 1.2.1 class: extension kind: complex-type url: https://fhir.nhs.wales/StructureDefinition/Extension-DataStandardsWales-SingleRecord-AllergiesListUpdated base: http://hl7.org/fhir/StructureDefinition/Extension version: 1.0.0