RFC 4324 Calendar Access Protocol (CAP) was officially published today by the IETF. CAP will provides a universal methodology for implementing real-time calendaring.
CAP permits a Calendar User (CU) to utilize a Calendar User Agent (CUA) to access an iCAL-based Calendar Store (CS) and manage calendar information. In particular, the document specifies how to query, create, modify, and delete iCalendar components (e.g., events, to-dos, or daily journal entries). It further specifies how to search for available busy time information.