{description: 'Base StructureDefinition for url type: A URI that is a literal reference', package_name: hl7.fhir.r4b.core, derivation: specialization, name: url, type: url, package_version: 4.3.0, class: primitive-type, kind: primitive-type, url: 'http://hl7.org/fhir/StructureDefinition/url', base: 'http://hl7.org/fhir/StructureDefinition/uri', version: 4.3.0}