description: The period during which the resource content was or is planned to be effective. package_name: hl7.fhir.r4.examples derivation: constraint name: effectivePeriod type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/resource-effectivePeriod'} index: 1 value: choices: [valuePeriod] index: 3 valuePeriod: {type: Period, choiceOf: value, index: 4} package_version: 4.0.1 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/resource-effectivePeriod base: http://hl7.org/fhir/StructureDefinition/Extension version: 4.0.1 required: [valuePeriod, value]