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From Angela Schreiber <anch...@day.com>
Subject Suggestion for PROPPATCH with simple-server (was: Status of jcr-server)
Date Thu, 06 Apr 2006 07:23:36 GMT
hi

i'd like to summarize the problem we are currently
having with matching a PROPPATCH request to JSR170
compliant repository (specially the RI) and come up
with a suggested solution.


Description
-----------------------------------------------------
While setting properties on a JSR170 repository is
defined for any level2 compliant implementation and
therefore matches the requirements of webDAV, the
current simple server limits a PROPPATCH request
to a setProperty call on the top most node of the
item structure that represents the dav property.


The nt:file nodetype
-----------------------------------------------------
As state before i think that given the nodetypes
available with jackrabbit, it is appropriate for
a default configuration to map nodes of nt:file
as non-collection dav-resources.
Except for a property jcr:created (inherited from
its supertype) this nodetype does not have or
allow additional properties. However, this nodetype
defines a jcr:content child node which can be
of any type. Due to the fact, that the default
handler uses nt:resource as nodetype for the jcr:content
child node the set of properties is limited (jcr:encoding,
jcr:lastModified, jcr:mimeType).


The import/export
-----------------------------------------------------
The IOHandler interface allows to apply specific import/export
behaviour for different types of resource without
modification of the DavResource implementation.
Since every particular handler knows about the under-
lying item structure, it is in charge of retrieving
properties (e.g. mimetype, contentlength) as well.
However, setting properties is not delegated to the
handlers (see above).


Proposed solution
-----------------------------------------------------

The situation described before leads me to the
following conclusion:

- IOHandler should not only read/write resource data
   and properties during GET, PUT, PROPFIND but should
   also take care of setting/removing properties without
   modifying the data during PROPPATCH.

- Since the previous suggestion would still limit
   the properties to (jcr:encoding, jcr:mimeType and
   jcr:lastModified), we may think about changing the
   default nodetype for the jcr:content node to
   nt:unstructured.

I guess this would meet the requirements for those
expecting a webDAV server that is (as a first step)
not limited regarding PROPPATCH. Second it would
allow to have a handling of property modifications
which is specific for individual resource types instead
of trying to set all properties to the uppermost node.

what do you think?

kind regards
angela

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