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XML Server ?



Hi all,

I have a need for an "XML Server" and I wonder if ozone or 
Prowler can fulfill my needs :

What I want to do is a knowledge base (that might be huge),
that is queried and updated through the web.
The web site is made with zope (www.zope.org) an object
oriented application server (python world).
I want to store my knowledge base in an XML DB.

When a user queries the KB (knowledge base), zope sends a
XPath (or XQL) query to the XMLDB, via a simple HTTP Post 
for example. The result is sent via a simple HTTP result : 
it should be the XML text of the answer (=a small part of the KB).

I also need a way to update the XML data through HTTP (from
the zope server to the XMLDB)...but I don't know any query 
language for this...

Update performance can be medium...but it would be nice to
have good query performance.

I think that XSL services are useless for me, as the HTML
formatting is done on the Zope Server.

I know eXcelon can fullfill my needs but it is too expensive
($50K !!!) and closed source...and doesn't work on my FreeBSD
boxes...

Can I use ozone or prawler to do so ? If yes, where can I find a 
simple example that will help me start ?

Or is there a better for this job ?

please help !

thx .