I believe this question has been asked before, but the requirement was for the Java open-source Java API HL7 v3, like HAPI. See Link.
The solutions currently offered are the property of HL7, focused on improving and developing RIM - a reference information model. This is the committee of the RIMBAA Architecture Architecture Working Group - RIM. See the page for a nice discussion about RIMBAA. In general, the open source APIs for v3 in both areas - java and .net are not currently available.
I believe that the HAPI and nHAPI teams may come up with something in the near future, or maybe they are already starting to work on it. You can write to the HAPI team for more information.
Good luck
Sid
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