http://hl7.org/fhir/StructureDefinition/url|5.0.0

url type: A URI that is a literal reference

element_id	types
url
url.value	http://hl7.org/fhirpath/System.String
url
url.id	http://hl7.org/fhirpath/System.String
url.extension	Extension
url.value	http://hl7.org/fhirpath/System.String