[Quote]
ValueSet - FHIR v4.1.0
http://build.fhir.org/valueset.html

4.9.3.1 ValueSet Identification\\...
ValueSet.identifier: A system/value pair ... (such as an OID in an HL7 v3 specification)

[Quote]
4.9.13 Resource ValueSet - Detailed Descriptions
http://build.fhir.org/valueset-definitions.html#ValueSet.url

ValueSet.url\\Comments:
Can be a urn:uuid: or a urn:oid: but real http: addresses are preferred. ...

[Question]

Which of the three ValueSet identifier types (id, url and identifier) an HL7 v3 OID of a ValueSet is?