I was looking at SapDB's source code and it seemed as if there was an effort at supporting XML storing, quering, and indexing capabilities at some point. From what I understand the goal of this was to supply a back end for WebDAV capabilities.
Now, the suggestion : How about exposing the XPath querying (it seems to be there already, just a hidden feature), and adding something like XUpdate for updating ?
There is a similar project going on with postgres :
http://gborg.postgresql.org/project/xpsql/projdisplay.php
And of course Oracle and DB2 have it in the form of SQL extensions where one can put an xpath expression in a where clause, etc...
As a first step, just exposing the existing XML storing/querying/indexing capabilities would seem like an
easy enough thing to do, no ?
Another alternative could be to allow WebDAV operations to occur withih the scope of an (sapDB) transaction, almost as good...
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