http://hl7.org/fhir/StructureDefinition/canonical|5.0.0
canonical type: A URI that is a reference to a canonical URL on a FHIR resource
{description: '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: 5.0.0}