http://www.rfc-editor.org/rfc/rfc6352.txt
RFC 6352: CardDAV: vCard Extensions to Web Distributed Authoring and Versioning (WebDAV), C. Daboo2011-08-01T23:00:00-00:00This document defines extensions to the Web Distributed Authoring and Versioning (WebDAV) protocol to specify a standard way of accessing, managing, and sharing contact information based on the vCard format. [STANDARDS-TRACK]