hierarchical database for repository

[Simon St.Laurent]

I'm looking around for a cheap - ideally open source - hierarchical
database to use with some XML experiments.  I'm aware of ADABAS and Tamino
from Software AG (which are way out of the price range) and dbb, a Berkeley
binary tree DB that gets used in lots of LDAP applications.  Simplicity is
a virtue - I'm not looking for something that does it all, just something I
can feed tree structures and get them back again.

I'd love to think such a thing exists in Java, but so far I haven't found
anything at all there, so I'll take what I can find.  If anyone knows of
anything, please let me know at simonstl at simonstl.com or post to the list.

Thanks!

Simon St.Laurent
XML Elements of Style / XML: A Primer, 2nd Ed.
Building XML Applications
Inside XML DTDs: Scientific and Technical
Cookies / Sharing Bandwidth
http://www.simonstl.com

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