description: A version string indicating the currency/validity of an identifier package_name: telus.dw.emr.extract-1-1-21 derivation: constraint name: ExtensionIdentifierVersion type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/ca/baseline/StructureDefinition/ext-identifierversion'} index: 1 value: mustSupport: true choices: [valueString] index: 3 valueString: {type: string, mustSupport: true, choiceOf: value, index: 4} package_version: 1.1.21 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/ca/baseline/StructureDefinition/ext-identifierversion base: http://hl7.org/fhir/StructureDefinition/Extension version: 2.0.0 required: [valueString, value]