[rules-users] How to execute a rule only when a fact is retracted

[dme1]

Hi,

How can I ensure that a rule is executed only when a fact is retracted. If I
implement the rule using a "not" condition it will execute even when the
object was never inserted into the working memory. Is there a way to
implement the rule such that it will not execute when a fact is never
inserted into the working memory, but executes only when the fact is
retracted from the working memory.

Thanks,
dme



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