XML and Databases - Discusses the relationship between XML and databases. Describes some of the types of software available to process XML documents with databases. - http://www.rpbourret.com/xml/XMLAndDatabases.htm
DbcDOM - XML library for DATABUS language. There are basic functions for export/import XML files. Contains additional classes for LinkedLists, Stacks, and Exceptions. - http://dbcdom.sourceforge.net/
Natix - Native XML database for Linux. - http://www.dataexmachina.de/natix.html