TIMBER ("Tree-structured native XML database Implemented at the University of Michigan by Bright Energetic Researchers") is a academic XML DBMS prototype.
Document / XML
XQuery
http://dbgroup.eecs.umich.edu/timber/
http://dbgroup-internal.eecs.umich.edu/timber/download.php
http://dbgroup.eecs.umich.edu/timber/usermanual/index.htm
University of Michigan
US
2006
Academic, Open Source
Berkeley DB, Shore