VCALENDAR
VEVENT
VTODO
VJOURNAL
VFREEBUSY
VTIMEZONE
XSTANDARDTIME
XDAYLIGHTSAVINGSTIME
VALARM
XAUDIOALARM
XDISPLAYALARM
XEMAILALARM
XPROCEDUREALARM
X
VSCHEDULE
VQUERY
VCAR
VCOMMAND
XLICINVALID
XMIMEPART
ANY