Recurrence ID changes?

["Dan Hickman" <dhickman@xxxxxxxxxxxxxxxxxx>]

The paragraph below is shown at the very end of section 3.7.1 in the rfc2446
(iTIP).  The last two sentences seem to conflict in meaning.  The first says
that "the original DTSTART value is used for RECURRENCE-ID" but the second
says that "RECURRENCE-ID has changed to the new DTSTART".

I thought we decided to leave the RECURRENCE-ID the same.  If the last
sentence is true, then it seems we would have to exclude the original date
in an "EXDATE" property and then include the new date in an "RDATE"
property.  Is this right?

   An instance of a recurring event is assigned a unique identification,
   "RECURRENCE-ID" property, when that instance is renegotiated.
   Negotiation may be necessary when a substantive change to the event
   or to-do has be made (such as changing the start time, end time, due
   date or location). The "Organizer" can identify a specific recurrence
   instance using the "RECURRENCE-ID" property. The property value is
   equal to the date/time of the instance. If the "Organizer" wishes to
   change the "DTSTART", the original "DTSTART" value is used for
   "RECURRENCE-ID" property and the new "DTSTART" and "DTEND" values
   reflect the change.  Note that after the change has occurred, the
   "RECURRENCE-ID" has changed to the new "DTSTART" value.

Thanks,
Dan Hickman