description: Specifies the temporal validity of an ehealth/message instance. Contains a period, eg. specifying temporal validity package_name: dk.ehealth.sundhed.fhir.ig.core derivation: constraint name: ehealth-period type: Extension elements: extension: {index: 0} url: pattern: {type: uri, value: 'http://ehealth.sundhed.dk/fhir/StructureDefinition/ehealth-period'} type: uri index: 1 value: choices: [valuePeriod] index: 3 valuePeriod: {type: Period, choiceOf: value, index: 4} package_version: 4.0.0 extensions: {} class: extension kind: complex-type url: http://ehealth.sundhed.dk/fhir/StructureDefinition/ehealth-period base: http://hl7.org/fhir/StructureDefinition/Extension version: 4.0.0 required: [value, valuePeriod]