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The three possible models are quite different from each
other.  I had already looked at these and found that I
needed some guidance to be able to add the
right functions in the right places.  Would I subclass
Database  from rdbmns_common.py and simply write the
"NotImplemented" functions?  Is there more to it?  I assume
there is.  More hints would be very helpful.  

Is this the right place to be asking these questions?