description: Indicates a date on which this identifier value was deemed to apply to this instance. package_name: hl7.fhir.core derivation: constraint name: External Identifier associated with this element type: Extension elements: extension: index: 0 slicing: slices: extension: match: {} schema: {index: 0} max: 0 url: type: uri pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/identifier-validDate'} index: 1 value: choices: [valueDateTime] index: 3 valueDateTime: {type: dateTime, choiceOf: value, index: 4} package_version: 1.8.0 extensions: extension: {url: null, max: 0, index: 0} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/identifier-validDate base: http://hl7.org/fhir/StructureDefinition/Extension version: null required: [valueDateTime, value]