Cyrus Daboo wrote:
I am not convinced the use of Depth in sync report is violating the
definition in 3253. In some ways it is a matter of how you look at the
sync. Your viewpoint is that the report asks the collection for its
changes - in that case, yes, Depth:0 would apply. The other view is that
the report asks each of the child resources to list their change status,
in which case Depth:1 and Depth:infinity also makes sense. Which
viewpoint is taken probably depends on actual implementation rather than
any perceived protocol restrictions.
My $.02:
I look the sync report as a filtered query for properties (e.g.
CALDAV:calendar-query), with the filter being "only give me a
DAV:response if the resource has been changed/removed since the
specified sync-token".
A Depth of 1 or infinity gives us exactly what is specified in the draft.
A Depth of 0 refers to the collection itself, and assuming it exists,
the DAV:multistatus response may or may not include a single
DAV:response element, depending on whether the server maintains an
entity tag on the collection which changes with its membership. In
either case, the sync-token is returned per the extended grammar in 6.3.
So, a sync-collection report with a depth of 0 might simply return the
following:
<D:multistatus>
<D:sync-token>http://example.com/ns/sync/1234</D:sync-token>
</D:multistatus>
Does this make sense, or is my logic completely convoluted?
--
Kenneth Murchison
Principal Systems Software Engineer
Carnegie Mellon University
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