ANY
PARTICIPANT
VAGENDA
VALARM
VAVAILABILITY
VCALENDAR
VCAR
VCOMMAND
VEVENT
VFREEBUSY
VJOURNAL
VLOCATION
VPATCH
VPOLL
VQUERY
VRESOURCE
VSCHEDULE
VTIMEZONE
VTODO
VVOTER
X
XAUDIOALARM
XAVAILABLE
XDAYLIGHTSAVINGSTIME
XDISPLAYALARM
XEMAILALARM
XLICINVALID
XMIMEPART
XPATCH
XPROCEDUREALARM
XSTANDARDTIME
XVOTE