Discoverer ERD's

Does anyone out there know of a tool that might be used to graph a Discovererer Business Area? This is sometimes the only documentation on foreign keys and relations between tables that exists in companies. It would be handy to extract that information using the BA's where they exist. And yes, I am aware of that a Business Area may not accurately reflect the structure of a database.  

Any ideas would be appreciated.  

Benjamin  

--
http://www.freelists.org/webpage/oracle-l