als as well as regions of space.  If someone wants to define
some concepts without using lines or points, those concepts should still
be very well-formed and well-defined.  If inferences on the objects 
defined in that way differ from those using points and lines, then
the users need to be aware of the differences and choose the 
representation that provides the reasoning power they need.


&gt; (Check the Cyc geography axioms pretty carefully, and be prepared to 
&gt; re-think them one at a time;
   Do you