On Mon, 7 Apr 2008 22:11:02 +0200 Helge Heß <me@helgehess.eu> wrote:
I'm not entirely sure what your question is. Especially your point 1) sounds incorrect. I don't think you can get a lock on an umapped-URL. You would need to lock the whole collection, then fetch all contained names, then create the item, then unlock the collection. Of course thats very expensive.
Maybe it is just me who has over interpreted it, but AFAIK RFC-4918 (as of June 2007. A copy can be found in the ICalenders doc/RFC folder - rfc4918-WebDAV Update.txt) section 7.3 writes "WebDAV provides the ability to send a LOCK request to an unmapped URL in order to reserve the name for use. This is a simple way to avoid the lost-update problem on the creation of a new resource (another way is to use If-None-Match header specified in Section 14.26 of [RFC2616]). It has the side benefit of locking the new resource immediately for use of the creator". To the best of my knowledge this indicate that the latest specification allows this - later on it even mentions "A successful lock request to an unmapped URL MUST result in the creation of a locked (non-collection) resource with empty content".
A LOCK can make sense on UPDATEs if you have a simple client which can't deal well with conflicts. LOCK, GET, show, make modifications, PUT, UNLOCK. This should never produce a conflict.
I would think shared calendars is another strong candidate. Conflicts with shared calendars should be a concern for the server and not the client. IMHO.
BTW: such generic questions are better placed on the CalDAV mailing list: http://lists.osafoundation.org/mailman/listinfo/ietf-caldav
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