There's a subtle point here: as written, this rule will match for each
friend that is not disliked. I think we want to match only once, if
there are no friends that are disliked, which is a different thing. I
think we want something like
(defrule check
(person (name ?name))
(not (and (person (name ?name) (friend $? ?f $?))
(dislike ?x)))
=>
(assert (allow ?name))
)
On Mar 7, 2009, at 3:57 PM, Wolfgang Laun wrote:
The binding for some element ?x anywhere in a multislot
is written like this
(ms $? ?x $?)
where $? matches "zero or more elments". Therefore,
(defrule check
(person (name ?name) (friend $? ?fx $?))
(not (dislike ?x))
=>
(assert (allow ?name))
)
asserts (allow ?name) iff there is no disliked ?x in ?name's friend
list.
-W
On Sat, Mar 7, 2009 at 8:57 PM, NehaP <[email protected]> wrote:
To make it more clear, if my person template had two slots instead
of a
multislot,
(deftemplate person
(slot name)
(slot friend))
I would write the rule like this
(defrule check
(person (name ?name) (friend ?friend))
(not (dislike ?friend))
=>
(assert (allow ?name))
)
However, my problem is that friend is a multislot and not a slot. So
I would
like to check if a fact exists for each member of the multislot
friend. How
do I do this?
Thanks,
Neha.
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Sandia National Labs
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