RFC 6352, "CardDAV: vCard Extensions to Web Distributed Authoring and Versioning (WebDAV)", August 2011Source of RFC: vcarddav (app)
Errata ID: 4784
Reported By: Ricki Hirner
Date Reported: 2016-08-20
Verifier Name: Alexey Melnikov
Date Verified: 2016-08-25
Section 10.4 says:
attributes can be used on each variant of the CALDAV:address-data XML element.
It should say:
attributes can be used on each variant of the CARDDAV:address-data XML element.
The address-data element is located in the CARDDAV namespace.