description: null package_name: bonsai.first.test.r4 derivation: constraint name: NLLPeriod type: Extension elements: url: pattern: {type: uri, value: 'http://electronichealth.se/fhir/StructureDefinition/NLLPeriod'} type: uri index: 0 value: choices: [valuePeriod] index: 2 valuePeriod: {type: Period, choiceOf: value, index: 3} package_version: 0.1.8 class: extension kind: complex-type url: http://electronichealth.se/fhir/StructureDefinition/NLLPeriod base: http://hl7.org/fhir/StructureDefinition/Extension version: 1.0.0