{description: A length of time, package_name: hl7.fhir.r2b.core, derivation: constraint, name: Duration, type: null, package_version: 1.4.0, class: datatype, kind: datatype, url: 'http://hl7.org/fhir/StructureDefinition/Duration', base: 'http://hl7.org/fhir/StructureDefinition/Quantity', version: null}