Apple has posted a great document discussing iCalendar files. Entitled “iCalendar Files on Mac OS X”, it goes way beyond that by talking openly about the iCalendar format, the role of .Mac, and third-party services (like iCal Exchange), and giving examples of how to parse iCalendar files with Perl’s Reefknot, or PHP iCalendar. Classy. And much more accessible then anything the CALSCH working group has ever put out.