If you are using Oracle, you should check out the java/xml tools available for download on the Oracle Technology Network, specifically the java xdk. You may need to register first, but after you do, you can follow this link: http://otn.oracle.com/software/tech/xml/xdk_java/content.html Other db vendors probably offer similar java api's.
Where is the source forge stuff? I am interested in converting an MS Access Database to an XML file. Is this possible? Or is it only possible with the big RDBMSes?