xmlizer configurator/server is a client/server approach for custom database to XML mapping. The configurator is used to set up projects and the server delivers the processed requests on demand (like a Web server) according to the mapping rules made with the configurator, which includes a drag and drop GUI. One module is for dumping databases (or parts of it) in a fixed format and the other module can build XML instances satisfying a specified XML Schema (or DTD).
Xml Validation Interoperability Framework (xvif) is a proposal to embed pipe definitions in grammar based schema languages such as Relax NG (and probably W3C XML Schema). The current implementation is built on a partial implementation of Relax NG, supporting the features needed to provide a representative proof of concept. It is available both as Python source code and as an online demonstration. Although there is no endorsement of any kind by the DSDL ISO initiative (http://dsdl.org), one of the goals of this prototype is to gather feedback which may be used (or not) by "DSDL Part 1 - Interoperability Framework".
DBX works using XML files as its native format. The database can be queried using standard SQL queries. DBX is the smallest, platform independent DBMS, and is extremely easy to migrate to. For small databases, it is a good substitute for MySQL, Oracle, etc. The added advantage is that it saves the data as neat, readable, XML files, allowing easy compatibility.