DF graph 
node (subject) within the domain restriction on the property. Therefore, it is 
enabled to add any slot (pair of role and filler) to any resource object without 
the explicit slot definition in the class. SWCLOS automatically adds the new 
slot definition in the class on the demand of new slot addition to an 
individual.</p>
<p>There is no special function for users to add new slots into objects in 
SWCLOS. Instead you can add new slots using <b>defIndividual</b> or 
<b>defConcept</b> macro, piece