PRIMER: new draft data model section

I've tried to address most of the comments I've received (in some cases 
I addressed them by ignoring them, but I hope I did it deliberately!) 
There are some inline editorial comments, notes, and other stuff to be 
fixed.  Sorry I didn't get this out sooner (and more completely);  I'm 
still recovering from whatever bug hit me last week (if you hear snoring 
tomorrow morning on the telecon, it'll probably be me).


--Frank


-- 
Frank Manola                   The MITRE Corporation
202 Burlington Road, MS A345   Bedford, MA 01730-1420
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