Health warning - Hacked up nastiness messing about with conversion of BIBFRAME/bibliotek-o back to MARC. This may or may not turn into anything useful, it certainly isn't even nearly there yet!

Philosophy is to take BIBFRAME or bibliotek-o RDF (in some format that rdflib can read), convert to JSON-LD in memory, use JSON-LD framing to restructure as a set of bf:Work, bf:Instance and bf:Item objects, and then build MARC record from these using pymarc. I wonder whether it will work?