description: The period in which the catalog is valid. package_name: rs/hl7.fhir.r5.core derivation: constraint name: ValidityPeriod type: Extension elements: extension: {index: 0} url: pattern: {type: uri, value: 'http://hl7.org/fhir/StructureDefinition/cqm-ValidityPeriod'} type: uri index: 1 value: choices: [valueDateTime] index: 3 valueDateTime: {type: dateTime, choiceOf: value, index: 4} package_version: 4.4.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/cqm-ValidityPeriod base: http://hl7.org/fhir/StructureDefinition/Extension version: 4.4.0 required: [value, valueDateTime]