> > There are no persistence layer defined in the OpenEhr specs, Thomas > said there will be specs for this after some time.
While reading the rest of the mails (I was a week or more behind), I see there is a lot of work being done (I have not yet read it all). I agree with Rong Chen that persistence should be generic and decoupled, and a good persistence layer fits on almost every application and on every db. It is like magic glue. The paper of Scott W. Ambler is very interesting in this context (google for it) Bert
