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=head3 VCard VCalendar Tags

The VCard module is also used to process iCalendar ICS files since they use
a format similar to vCard.  The following table lists standard iCalendar
tags, but any existing tags will be extracted.  Top-level iCalendar
components (eg. Event, Todo, Timezone, etc.) are used for the family 1 group
names, and embedded components (eg. Alarm) are added as a prefix to the tag
name.  See L<http://tools.ietf.org/html/rfc5545> for the official iCalendar
2.0 specification.

  Tag ID                Tag Name                Writable
  ------                --------                --------
  'Acknowledged'        Acknowledged            no
  'Action'              Action                  no
  'Attach'              Attachment              no
  'Attendee'            Attendee                no
  'Calscale'            CalendarScale           no
  'Categories'          Categories              no
  'Class'               Classification          no
  'Comment'             Comment                 no
  'Completed'           DateTimeCompleted       no
  'Contact'             Contact                 no
  'Created'             DateCreated             no
  'Description'         Description             no
  'Dtend'               DateTimeEnd             no
  'Dtstamp'             DateTimeStamp           no
  'Dtstart'             DateTimeStart           no
  'Due'                 DateTimeDue             no
  'Duration'            Duration                no
  'Exdate'              ExceptionDateTimes      no
  'Freebusy'            FreeBusyTime            no
  'Geo'                 Geolocation             no
  'Last-modified'       ModifyDate              no
  'Location'            Location                no
  'Method'              Method                  no
  'Organizer'           Organizer               no
  'Percent-complete'    PercentComplete         no
  'Priority'            Priority                no
  'Prodid'              Software                no
  'Rdate'               RecurrenceDateTimes     no
  'Recurrence-id'       RecurrenceID            no
  'Related-to'          RelatedTo               no
  'Repeat'              Repeat                  no
  'Request-status'      RequestStatus           no
  'Resources'           Resources               no
  'Rrule'               RecurrenceRule          no
  'Sequence'            SequenceNumber          no
  'Status'              Status                  no
  'Summary'             Summary                 no
  'Transp'              TimeTransparency        no
  'Trigger'             Trigger                 no
  'Tzid'                TimezoneID              no
  'Tzname'              TimezoneName            no
  'Tzoffsetfrom'        TimezoneOffsetFrom      no
  'Tzoffsetto'          TimezoneOffsetTo        no
  'Tzurl'               TimeZoneURL             no
  'Uid'                 UID                     no
  'Url'                 URL                     no
  'Version'             VCalendarVersion        no
  'X-apple-calendar-color' CalendarColor        no
  'X-apple-default-alarm' DefaultAlarm          no
  'X-apple-local-default-alarm'
                        LocalDefaultAlarm       no
  'X-microsoft-cdo-alldayevent' AllDayEvent     no
  'X-microsoft-cdo-appt-sequence'
                        AppointmentSequence     no
  'X-microsoft-cdo-busystatus' BusyStatus       no
  'X-microsoft-cdo-importance' Importance       no
  'X-microsoft-cdo-insttype' InstanceType       no
  'X-microsoft-cdo-intendedstatus'
                        IntendedBusyStatus      no
  'X-microsoft-cdo-ownerapptid'
                        OwnerAppointmentID      no
  'X-microsoft-disallow-counter'
                        DisallowCounterProposal no
  'X-microsoft-donotforwardmeeting'
                        DoNotForwardMeeting     no
  'X-microsoft-locations' MeetingLocations      no
  'X-wr-alarmuid'       AlarmUID                no
  'X-wr-caldesc'        CalendarDescription     no
  'X-wr-calname'        CalendarName            no
  'X-wr-relcalid'       CalendarID              no
  'X-wr-timezone'       TimeZone2               no

=head3 VCard VNote Tags

Tags extracted from V-Note VNT files.

  Tag ID               Tag Name                 Writable
  ------               --------                 --------
  'Body'               Body                     no
  'Dcreated'           CreateDate               no
  'Last-modified'      ModifyDate               no
  'Version'            Version                  no

=head2 Text Tags

Although basic text files contain no metadata, the following tags are
determined from a simple analysis of the data in TXT and CSV files.
Statistics are generated only for 8-bit encodings, but the FastScan (-fast)
option may be used to limit processing to the first 64 KiB in which case
some tags are not produced.  To avoid long processing delays, ExifTool will
issue a minor warning and process only the first 64 KiB of any file larger
than 20 MiB unless the IgnoreMinorErrors (-m) option is used.

  Tag Name                                      Writable
  --------                                      --------
  ByteOrderMark                                 no
  ColumnCount                                   no
  Delimiter                                     no
  LineCount                                     no
  MIMEEncoding                                  no
  Newlines                                      no
  Quoting                                       no
  RowCount                                      no
  WordCount                                     no

=head2 RSRC Tags

Tags extracted from Mac OS resource files, DFONT files and "._" sidecar