BEGIN:VCALENDAR
PRODID:-//Emacs//NONSGML icalendar.el//EN
VERSION:2.0
BEGIN:VEVENT
DTSTART;VALUE=DATE:20040815
DTEND;VALUE=DATE:20040816
SUMMARY:Maria Himmelfahrt
RRULE:FREQ=YEARLY;INTERVAL=1;BYMONTH=8
END:VEVENT
END:VCALENDAR