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RFC 4791, "Calendaring Extensions to WebDAV (CalDAV)", March 2007

Source of RFC: IETF - NON WORKING GROUP
Area Assignment: app
See Also: RFC 4791 w/ inline errata

Errata ID: 4159
Status: Verified
Type: Editorial
Publication Format(s) : TEXT
Reported By: Hiroaki KAWAI
Date Reported: 2014-11-05
Verifier Name: Barry Leiba
Date Verified: 2015-02-06

Section 7.8.5 says: 

   BEGIN:VTODO
   DTSTAMP:20060205T235300Z
   DUE;TZID=US/Eastern:20060106T120000
   LAST-MODIFIED:20060205T235308Z
   SEQUENCE:1
   STATUS:NEEDS-ACTION
   SUMMARY:Task #2
   UID:E10BA47467C5C69BB74E8720@example.com
   BEGIN:VALARM
   ACTION:AUDIO
   TRIGGER;RELATED=START:-PT10M
   END:VALARM
   END:VTODO

It should say:

   BEGIN:VTODO
   DTSTAMP:20060205T235300Z
   DUE;TZID=US/Eastern:20060106T120000
   LAST-MODIFIED:20060205T235308Z
   SEQUENCE:1
   STATUS:NEEDS-ACTION
   SUMMARY:Task #2
   UID:E10BA47467C5C69BB74E8720@example.com
   BEGIN:VALARM
   ACTION:AUDIO
   TRIGGER;RELATED=END:-PT10M
   END:VALARM
   END:VTODO

Notes:

RELATED is not START but END.

Both rfc2445 section4.8.6.3 and rfc5545 section3.8.6.3 says:

If the trigger is set relative to START, then the "DTSTART"
property MUST be present in the associated "VEVENT" or "VTODO"
calendar component. If an alarm is specified for an event with
the trigger set relative to the END, then the "DTEND" property or
the "DTSTART" and "DURATION " properties MUST be present in the
associated "VEVENT" calendar component. If the alarm is specified
for a to-do with a trigger set relative to the END, then either
the "DUE" property or the "DTSTART" and "DURATION " properties
MUST be present in the associated "VTODO" calendar component.

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