The dbXML Project has a complete Core Level 1 Java implementation based on the Sept. 24 draft. The implementation is part of the 1.0b1 release of the dbXML Core. The eXist Project has a Core Level 1 Java implementation based on the Sept. 24 draft. The implementation is part of the 0.6 release of eXist. The Ozone Project is working on a Java implementation based on the May 07 draft.
Work is in the early stages.
Jeremias Maerki has developed a java implementation for JDBC datasources based on the May 07 draft. Ultimately, collections of XML files will be accessed like databases. Although it is not intended to be exhaustive, I hope that it describes some of the major issues in using XML with databases. It is somewhat biased towards relational databases simply because that is where my experience is. All Rights Reserved.