MySQL-XML Released
Brandon Niemczyk writes "MySQL-XML version 1.12 was finally released (GPL) publicly. MySQL-XML is a set of classes to streamline XML to MySQL and MySQL to XML. It comes with an automatic PHP class generator so the developer can quickly create classes to customize utilizing databases and keeping the flexibility of XML. MySQL-XML homepage is http://www.capableweb.com and it can be downloaded at http://sourceforge.net/projects/phpsqlxml/"
Sorry, that's a tad unclear. By this I mean copyright holders can release software under as many licences as they want. The consumer has to choose only one though.
yadda yadda
mysql has transaction support, you need to use the Berkley-DB tables (you may have to recompile)
Try SAP DB. It seriously competes with Oracle and DB2 and is a helluva lot cheaper, not to mention being available under the GPL/LGPL.