description: The date when the value set version is no longer expected to be used to create new content. This is the first date-time when the value set version becomes Inactive, so this value MUST present on all Inactive value set versions. The start Date_time is expected to be as of 0001 UTC of the Expiration Date. package_name: rs/hl7.fhir.core derivation: constraint name: When the value set version should no longer be used type: null elements: extension: {name: extension, index: 0} url: type: uri pattern: {type: uri, value: 'http://hl7.org/fhir/StructureDefinition/codesystem-expirationDate'} index: 1 value: choices: [valueDate] index: 3 valueDate: {type: date, choiceOf: value, index: 4} package_version: 1.4.0 extensions: {} class: datatype kind: datatype url: http://hl7.org/fhir/StructureDefinition/codesystem-expirationDate base: http://hl7.org/fhir/StructureDefinition/Extension version: null required: [value, valueDate]