Re: Recurrence ID changes?

[Alexander Taler <alext@xxxxxx>]

Frank_Dawson@lotus.com wrote:
> 
> This is improver iCalendar sytax. No "UID", no "SEQUENCE", etc.
> Maybe you weren't trying to be precise?
> 
> You can only add events to an existing request with an "ADD" method;
> not a "REQUEST".
> 
> Dan's point was not just the scenario for adding an occurrence, but
> changing some other details in an occurrence so that a single
> REQUEST would actually obliterate the differences. You are right,
> for this you might be able to use a second REQUEST with an
> incremented "SEQUENCE" value and a "RECURRENCE-ID" to show the
> different property values from the original occurrence set. That is,
> as long as the occurrence was defined in the occurrence set defined
> by the initial "REQUEST".
> 

Frank,

I was replying to what you said here 
(Message-ID: <>):

> That is good! I forgot about this case. This is the case where you 
> send out a REQUEST (SEQUENCE=0), then follow it up with a
> REQUEST (SEQUENCE=1, RECURRENCE-ID=19990726T133000Z) that changes the 
> LOCATION (or some such peripheral property).
> Now you can't just send one REQUEST reply to the REFRESH. The 
> RECURRENCE-ID values specifies one occurrence that will need
> a separate REQUEST to specify the different LOCATION property (or 
> whatever). 

I don't think that you ever need separate REQUESTs to respond to 
a refresh.  The following is valid iTIP, and shows how a single
REQUEST can include instance specific information.  (Each recurrence
has a different location.)  This could be an initial REQUEST
(SEQUENCE:0) or a response to a REFRESH.

BEGIN:VCALENDAR
METHOD:REQUEST
PRODID:bad string
VERSION:2.0

BEGIN:VEVENT
LOCATION:My place
UID:foo
ATTENDEE:mailto:bar@foo.tv
ORGANIZER:mailto:bar@foo.tv
DTSTART:19990712T000000Z
DTSTAMP:19990702T000000Z
SUMMARY:Bridge night
END:VEVENT

BEGIN:VEVENT
LOCATION:Martha's place
UID:foo
ATTENDEE:mailto:bar@foo.tv
ORGANIZER:mailto:bar@foo.tv
DTSTART:19990719T000000Z
DTSTAMP:19990702T000000Z
SUMMARY:Bridge night
END:VEVENT

BEGIN:VEVENT
LOCATION:Local pub
UID:foo
ATTENDEE:mailto:bar@foo.tv
ORGANIZER:mailto:bar@foo.tv
DTSTART:19990726T000000Z
DTSTAMP:19990702T000000Z
SUMMARY:Bridge night
END:VEVENT

END:VCALENDAR


Alex