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Re: DTSTART for recurrence instances


(Again the topic is DTSTART for recurrence instances, not any thing else)

Is there any disagreement that these are -also- a valid ways to change the 2nd instance:

Again starting from the same original object.

  BEGIN:VEVENT
  UID:XXX
  SEQUENCE:0
  ...
  METHOD:REQUEST
  ATTENDEE:attendee
  ...
  DTSTART: 1-dec-2003 at noon
  DTEND: 1-dec-2003 at 1pm
  ...
  RRULE:FREQ=DAILY;COUNT=3
  ...
  END:VEVENT

(And 'attendee' sends a reply saying yes).

Method A: Now later ORGANIZER sends iTIP updates to move the second instance
from noon->1pm and have it at 2pm->3:30pm:

  BEGIN:VCALENDAR
  ...
  METHOD:REQUEST
  BEGIN:VEVENT
  UID:XXX
  SEQUENCE:1
  ...
  DTSTART: 1-dec-2003 at noon
  DTEND: 1-dec-2003 at 1pm
  ...
  RDATE:3-dec-2003 at noon
  ...
  END:VEVENT
  END:VCALENDAR

BEGIN:VCALENDAR
METHOD:ADD
BEGIN:VEVENT
UID:XXX
SEQUENCE:2
...
DTSTART:2-dec-2003 at 2pm
DTEND:2-dec-2003 at 3:30pm
...
END:VEVENT
END:VCALENDAR
Method B: Now later ORGANIZER sends iTIP updates to move the second instance
from noon->1pm and have it at 2pm->3:30pm:

  BEGIN:VEVENT
  UID:XXX
  SEQUENCE:1
  ...
  METHOD:REQUEST
  ATTENDEE:attendee
  ...
  DTSTART: 1-dec-2003 at noon
  DTEND: 1-dec-2003 at 1pm
  ...
  RRULE:FREQ=DAILY;COUNT=3
  EXDATE:2-dec-2003 at noon
  ...
  END:VEVENT

BEGIN:VCALENDAR
METHOD:ADD
BEGIN:VEVENT
UID:XXX
SEQUENCE:2
...
DTSTART:2-dec-2003 at 2pm
DTEND:2-dec-2003 at 3:30pm
...
END:VEVENT
END:VCALENDAR
Method C: -OR- this:

  BEGIN:VCALENDAR
  ...
  METHOD:CANCEL
  BEGIN:VEVENT
  UID:XXX
  SEQUENCE:1
  ...
  RECURRENCE-ID:2-dec-2003 at noon
  ...
  END:VEVENT
  END:VCALENDAR

  BEGIN:VCALENDAR
  METHOD:ADD
  BEGIN:VEVENT
  UID:XXX
  SEQUENCE:2
  ...
  DTSTART:2-dec-2003 at 2pm
  DTEND:2-dec-2003 at 3:30pm
  ...
  END:VEVENT
  END:VCALENDAR

Do you agree that these are also valid objects to tell the ATTENDEE of the single instance change?

--

Doug Royer                     |   http://INET-Consulting.com
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