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