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iCalendar DTD Document (xCal)

The 2001-08-20 IETF document iCalendar DTD Document (xCal) defines an XML Document Type Definition (DTD) that corresponds to the iCalendar, Internet Calendaring and Scheduling Core Object Specification defined by RFC 2445. This DTD provides equivalent functionality to the standard format defined by RFC 2445. Documents structured in accordance with this DTD may also be known as 'XML iCalendar' documents or 'xCal'.

http://xml.coverpages.org/iCal.html