I'm currently working on a next generation of our product which will utilize a native XML database. We chose that in favor of a RDBMS for various reasons, but mostly due to the fact that our schema is dynamic and best supported by storing it that way.
One of the challenges of course is a persistence framework. There are so many in the relational world, but lacking in XML world, IMO. There are great frameworks, like yours, that handle the mappings, but we're still missing the pieces that actually make it a true persistence framework ( i.e. integration with XQuery, Native XML Storage systems, XQJ, etc...). So I set up to create such a framework. I'm in the progress of completing the specifications, though I already started a bit of coding, mostly interfaces and some diagramming. As of right now, although I'm making it as loosely coupled as possible, it's being developed and tested using RainingData's TigerLogic db. They are one of the leaders in the XML Native database worlds and have a pretty nice implementations of XQuery engine, XUpdate, and a preliminary XQJ implementation, which right now has some proprietary features, since XQJ is still in the early draft review phase.
I believe that such an abstraction layer on top of a great mapping system like JibX, would create a great persistence framework for the native XML persistence world.
Ilya Sterin
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