could you please add some more details to which output format you are referring, too?
JabRef supports multiple export formats, where some of them are all a kind of XML dialect, so some more details owuld be helpful
Sorry, I use docbook output here. Best would be docbook5, but I would also be content with docbook 4, since there are only three (four) items to be changed to make a docbook 5 output from db4. The brackets are whether there is a weblink or not.