I've also tried DocBook export from JabRef 2.6: it is totally broken. The "xml" generated does not nearly validate, especially when using DocBook 5.
I can offer some help as I have a commercial authoring tool at hand, which does quite decent validation using the official DocBook 5 RelaxNG schema.
However, it seems that there is some work required on the side of JabRef coding, as there are several problems, such as generating empty author and editor lists, which are not allowed. Also, many fields are missing from export, albeit there is decent DocBook 5 support for them. xmk:id generation is also a problem, as JabRef does not enforce valid ids. An automatic correction would be fine. Then, JabRef creates superfluous reference attributes which are in violation of the DocBook 5 schema.
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I've also tried DocBook export from JabRef 2.6: it is totally broken. The "xml" generated does not nearly validate, especially when using DocBook 5.
I can offer some help as I have a commercial authoring tool at hand, which does quite decent validation using the official DocBook 5 RelaxNG schema.
However, it seems that there is some work required on the side of JabRef coding, as there are several problems, such as generating empty author and editor lists, which are not allowed. Also, many fields are missing from export, albeit there is decent DocBook 5 support for them. xmk:id generation is also a problem, as JabRef does not enforce valid ids. An automatic correction would be fine. Then, JabRef creates superfluous reference attributes which are in violation of the DocBook 5 schema.
I'm pretty maxed out right now but would be quite interested in contributing to a patch next year sometime....