This is rather like a compensating transaction (ie "undo") and is necessary
when say communicating with a system that is external to the rules engine
itself. If it were within the rule engine I could just use a logical condition).
One solution might be to hold a rerference to the original fact (in another)
and have a rule that fires when the referenced fact no longer exists. For
example:
(?bind ?a (assert A))
(assert B ?a)
Now If I say:
(retract ?a)
How would I write a rule that says:
if there is a (B ?a)
such that ?a doesn't exist
It's relatively simple in JRules but that doesn't necessary make it the right
thing to do :-)
So, does this actually make sense? If so, how do I achieve this? If not, what
are my options?
Cheers,
Simon
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