Databases tailored for the storage of XML data represent an exciting new opportunity for improvement in the storage and manipulation of data and metadata. For a large set of applications an XML Database will often far surpass traditional data storage mechanisms in convenience, ease of development and performance.

http://www.xmldb.org/ or http://xmldb-org.sourceforge.net/

The XML:DB Initiative's long term goals can be summarized as: (1)Development of technology specifications for managing the data in XML Databases. (2)...

http://xml.apache.org/xindice/ Apache Xindice is a database designed from the ground up to store XML data or what is more commonly referred to as a native XML database.

list http://www.garshol.priv.no/download/xmltools/cat_ix.html#SC_XMLDBMS includes FtSuite and RedFoot

Ronald Bourret's list http://www.rpbourret.com/xml/XMLDatabaseProds.htm

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