JESS: First try with backward-chaining

[Skeptic 2000]

Hi,
I tried for the first time to use backward-chaining and I can't figure out 
why this simple example don't work :

(deftemplate x
   (declare (backchain-reactive TRUE))
   (slot a)
   (slot b)
)

(defrule printX
 (x (b 12))
 =>
 (printout t "yeah!")
)

(defrule createX
 (need-x (b ?y))
  =>
 (assert (x (a 3) (b ?y)))
)

(run)

Thanks !

_________________________________________________________________
Ne perdez pas de temps dans les files d’attente… magasinez en ligne.  
http://magasiner.sympatico.msn.ca

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