There's an interesting WebProtege project of MARC21-to-BIBFRAME data.[1] 
I'm working with Protege for some non-BIBFRAME data, but would LOVE to 
know more about how this was done. If you are the person or persons 
involved, please speak up.

kc
[1] 
http://webprotege.stanford.edu/#Edit:projectId=1033ee5d-9adc-4741-9598-0c1180812983

-- 
Karen Coyle
[log in to unmask] http://kcoyle.net
m: 1-510-435-8234
skype: kcoylenet