Dealing with invites to individual instances

["Michael Fair" <michael@xxxxxxxxxxxxxxx>]

In the wake of Derik and Frank's generous post on
their understanding of how the iCal model works,
and at the risk of further disagreement, I have
a question about inviting CUs to individual
recurrences and not the entire series.


If I invite a CU using UID:1/RID:123/SEQ:0
and then reschedule UID:1 such that instance 123
is no longer a member of the recurrence set, how
do I communicate this change to the CU?

For arguments sake we'll say it got replaced
with RID:ABC.

As I understand it, the CU will never see UID:1
since they aren't invited to it and will only have
received messages about RID:123.

So when a message for RID:ABC shows up how will it
know that this object replaces RID:123 and is not
a new invite to RID:ABC in addition to RID:123?

Again this is strictly limited to when a CU is
not invited to the base recurring set.

Do you send them the base event anyway?
Do you have to cancel RID:123?
Is there something more that I'm missing?
Does something need to be added to iCal/iTIP to handle this case?


Thanks,
-- Michael --