I've had the best luck with eXist and BerkeleyDB XML.

Both support XQuery and have indexing features based on any XML structure.


On 1/16/10, Godmar Back <god...@gmail.com> wrote:
> Hi,
> we're currently looking for an XML database to store a variety of
> small-to-medium sized XML documents. The XML documents are
> unstructured in the sense that they do not follow a schema or DTD, and
> that their structure will be changing over time. We'll need to do
> efficient searching based on elements, attributes, and full text
> within text content. More importantly, the documents are mutable.
> We'll like to bring documents or fragments into memory in a DOM
> representation, manipulate them, then put them back into the database.
> Ideally, this should be done in a transaction-like manner. We need to
> efficiently serve document fragments over HTTP, ideally in a manner
> that allows for scaling through replication. We would prefer strong
> support for Java integration, but it's not a must.
> Have other encountered similar problems, and what have you been using?
> So far, we're researching: eXist-DB (http://exist.sourceforge.net/ ),
> Base-X (http://www.basex.org/ ), MonetDB/XQuery
> (http://www.monetdb.nl/XQuery/ ), Sedna
> (http://modis.ispras.ru/sedna/index.html ). Wikipedia lists a few
> others here: http://en.wikipedia.org/wiki/XML_database
> I'm wondering to what extent systems such as Lucene, or even digital
> object repositories such as Fedora could be coaxed into this usage
> scenario.
> Thanks for any insight you have or experience you can share.
>  - Godmar

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