I'm having trouble with a pattern conditional element.
Hopefully someone will spot the answer in a second, and if
so I would really appreciate any advice.
If I try to match on every fact "abc" where "x" is an
element in the multislot "items", this works:
?f1 <- (abc (items $? x $?))
But I can't figure out how to match on every fact "abc"
where "x" is _not_ an element. I've read both the Jess
readme and the CLIPS manual, and tried various combinations
of "~" and "NOT", but I can't get anything that compiles.
Here's a file that reproduces my situation in the simplest
possible form, with the line in question highlighted.
------------------------------------------
(watch all)
(deftemplate abc
(multislot items)
)
(defrule rule1
;===========================================================
;The following works. The question is, how do you negate
it?
?f1 <- (abc (items $? x $?))
;===========================================================
=>
)
(defrule startup ""
=>
(assert (abc (items x)))
(assert (abc (items y)))
(assert (abc (items x y)))
(assert (abc (items y x)))
)
(reset)
(run)
------------------------------------------
Thanks for any advice.
-- David Thureson
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