This parameter specifies a unique recurrence date of an event or todo. Use rid in conjunction with the mod parameter to specify a range of events and todos to be modified.
For example:
http://webcalendarserver/storecomponents.wcap
?id=b5q2o8ve2rk02nv9t6
&calid=jdoe
&uid=333
&dtstart=20020301T112233Z
&rid=20020331T112233
&dtend=20020301T112233
&summary=uuuu&mod=1
|
For a non-recurring event or todo, the rid is 0.