http://www.rfc-editor.org/rfc/rfc4791.txt
RFC 4791: Calendaring Extensions to WebDAV (CalDAV), C. Daboo, B. Desruisseaux, L. Dusseault2007-03-01T23:00:00-00:00This document defines extensions to the Web Distributed Authoring and Versioning (WebDAV) protocol to specify a standard way of accessing, managing, and sharing calendaring and scheduling information based on the iCalendar format. This document defines the "calendar-access" feature of CalDAV. [STANDARDS-TRACK]