Re: What's the purpose of CLEANUP rule in mab-clos.lisp example?

This is just an example of how one can do pattern matching on a clos 
hierarchy. There are classes in mab-clos that derive from mab-fundamental; 
the cleanup rule simply matches all instances of class mab-fundamental and 
retracts them.

dey

On Friday 06 May 2005 02:48 pm, Paolo Amoroso wrote:
> What is the purpose of the CLEANUP rule:
>
>   ;;; Retract every object whose ancestor is an instance of
> MAB-FUNDAMENTAL...
>
>   (defrule cleanup (:salience -100)
>     (?fact (mab-fundamental))
>     =>
>     (retract ?fact))
>
> in the mab-clos.lisp Lisa example?  Why is it necessary to retract
> objects whose ancestors are instances of MAB-FUNDAMENTAL?
>
>
> Paolo


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