description: 'DSTU2: `Account.activePeriod` additional types (Period) additional types from child elements (end, start)' package_name: hl7.fhir.uv.xver-r2.r4 derivation: constraint name: ExtensionAccount_ActivePeriod type: Extension elements: url: base: {max: '1', min: 1, path: Extension.url} pattern: {type: Uri, value: 'http://hl7.org/fhir/1.0/StructureDefinition/extension-Account.activePeriod'} index: 0 value: short: Valid from..to choices: [valuePeriod] base: {max: '1', min: 0, path: 'Extension.value[x]'} index: 2 valuePeriod: short: Valid from..to type: Period base: {max: '1', min: 0, path: 'Extension.value[x]'} choiceOf: value index: 3 package_version: 0.1.0 class: extension kind: complex-type url: http://hl7.org/fhir/1.0/StructureDefinition/extension-Account.activePeriod base: http://hl7.org/fhir/StructureDefinition/Extension|4.0.1 version: 0.1.0 required: [url]