See also:
RFC 2446: iCalendar Transport-Independent Interoperability Protocol (iTIP)
tools.ietf.org
Specifies how calendaring systems can use iCalendar objects to interoperate with other calendar systems.
RFC 2447: iCalendar Message-Based Interoperability Protocol (iMIP)
tools.ietf.org
Specifies a binding from the iCalendar Transport-independent Interoperability Protocol (iTIP) to internet email-based transports.
RFC 2445: Internet Calendaring and Scheduling Core Object Specification (iCalendar)
tools.ietf.org
Official specification for the format, including full syntax and recommendations.- Wikipedia: iCalendar - Encyclopdia article on the format, with an overview of the specifications, and details of various implementations.
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