> or is somebody else working on an alternative?
According to stefan the best option would be a b-tree database like berkeley db. It seems the Michael Aemisegger is interested in writing a BTreePersistenceManager for berkeley db. And I'm doing some research for writing one for xindice.
see http://article.gmane.org/gmane.comp.apache.jackrabbit.devel/1228.
-- Cheers, Michael
