WebObjects/EOF/Using EOF/Custom EOAdaptor
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It's surprisingly easy to create a simple custom EOAdaptor. In 2002, there was a post to the Omni WebObjects mailing list with the code necessary to do implement a File System EOAdaptor (obviously the WO version is a little old, but it should be a good starting point):
http://www.wodeveloper.com/omniLists/eof/2002/June/msg00053.html