JESS: A question about the knowledge base and rules..

[Calicrates Policroniades Borraz]

Hi, I have  a simple question.

If I have the next simple rule in a script:

(defrule I-cant-see-the-object
   (not (element (name "object")))
   =>
   (assert (no_object))
)

where element is a bean that comes from a Java program and name is a slot.

I clear the kb of elements with rete.executeCommand("(undefinstance *)")
If the previous rule is fired once, it will not be fired again because the
element wich name is "object" has fired the rule even though I had
cleared the kb of elements. I mean, If I include a new element with name
"object" it won't fire the rule. I suppouse that Jess takes the new income
as if were the one that fired the rule previously.

I understand this property with simple asserted facts (because support
the refraction property of an expert system), but it's not clear for me
why a bean that has bean removed with undefinstance and included again in
the kb is not recognized by the rule as a new fact. 

How can I activate the rule with the new income that comes in the shape
of a bean without Jess thinks that is the same fact?

Thank you in advance...

Calicrates.

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