http://hl7.org/fhir/StructureDefinition/canonical|4.0.1

{description: 'Base StructureDefinition for canonical type: A URI that is a reference to a canonical URL on a FHIR resource', derivation: specialization, name: canonical, type: canonical, class: primitive-type, kind: primitive-type, url: 'http://hl7.org/fhir/StructureDefinition/canonical', base: 'http://hl7.org/fhir/StructureDefinition/uri', version: 4.0.1}