1.4 Relationship to Other Protocols
The Web Distributed Authoring and Versioning (WebDAV) Extensions for Calendar Support depend on the HTTP Extensions for Distributed Authoring -- WebDAV, as described in [RFC2518]. WebDAV, in turn, relies on Hypertext Transfer Protocol (HTTP) 1.1, as described in [RFC2068]. These extensions also rely on the Hypertext Transfer Protocol over Secure Sockets Layer (HTTPS), as specified in [RFC2818], for data protection services.
This specification is similar in scope to [RFC4791]; however, the requirements for this specification were created before [RFC4791]. While similar in concept, the WebDAV Extensions for Calendaring Support are not fully compatible with the Calendaring Extensions to WebDAV described in [RFC4791].
For conceptual background information and overviews of the relationships and interactions between this and other protocols, see [MS-OXPROTO].