built on technology 
that's been around a bit longer, so it's not surprising there would be 
software implemented for it.  That doesn't mean there some technical 
obstacle.  Another issue is that existing DB languages are less expressive 
than logic.  If the data modeling tool is just an ER diagram, it maps 
trivially into a DB schema.

&gt; &gt; We then wrote scripts, again by hand, to map the
&gt; &gt; contents of
&gt; &gt; each MLS database into our common database.
&gt;
&gt;MW: There are sophisticated t