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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