XML

DbcDOM - XML library for DATABUS language. There are basic functions for export/import XML files. Includes additional classes for LinkedLists, Stacks, and Exceptions.
dbcdom.sourceforge.net/

Natix - Native XML database for Linux.
www.dataexmachina.de/natix.html

XML and Databases - Discusses the relationship between XML and databases. Describes some of the types of software available to process XML documents with databases.
www.rpbourret.com/xml/XMLAndDatabases.htm