"iCalendar Transport-Independent Interoperability Protocol (iTIP)", Cyrus Daboo, 11-May-08. ( bytes): This document specifies a protocol using the iCalendar object specification to provide scheduling interoperability between different calendar systems. This is done without reference to a specific transport protocol so as to allow multiple methods of communication between systems. Subsequent documents will define profiles of this protocol using specific interoperable methods of communications between systems. iTIP complements the iCalendar object specification by adding semantics for group scheduling methods commonly available in current calendar systems. These scheduling methods permit two or more calendar systems to perform transactions such as publish, schedule, reschedule, respond to scheduling requests, negotiation of changes or cancel.
"Internet Calendaring and Scheduling Core Object Specification (iCalendar)", Bernard Desruisseaux, 6-Feb-08. ( bytes): This document defines the iCalendar data format for representing and exchanging calendaring and scheduling information such as events, to- dos, journal entries and free/busy information, independent of any particular calendar service or protocol.

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