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Hey Godmar, I'd definitely consider CouchDB as Patrick mentioned. It's a "schema-free" JSON document database and replication is it's greatest strength. It does have Lucene integration: http://github.com/rnewson/couchdb-lucene Paul J. Davis of the core CouchDB team has a nice write-up: http://www.davispj.com/2009/01/18/couchdb-lucene-indexing.html There's also some Solr integration available: http://github.com/deguzman/couchdb-solr2 From what you've described, CouchDB would be a great choice for your application. Hope that's helpful, Godmar, Benjamin -- President BigBlueHat P: 864.232.9553 W: http://www.bigbluehat.com/ http://www.linkedin.com/in/benjaminyoung Godmar Back 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 >