Not sure what "dynamic" means in this context. But you can use the "forall"
conditional element to implement this rule. You could read the LHS here as "For
all values of ?name in bag-of-items, there's a corresponding item fact."
(defrule check-bag-valid
(forall
(bag-of-items (names $? ?name $?))
(item (name ?name)))
=>
(printout t "The bag is valid" crlf))
NOTE: Like many complex Jess rules, this one won't fire unless before adding
your facts you've executed the "(reset)" command to asset (initial-fact).
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Aurelien Mazurie
Sent: Friday, July 26, 2013 4:56 PM
To: jess-users
Subject: JESS: [EXTERNAL] Dynamic rule matching in the LHS
Dear Jess users,
I am wondering how to write a rule that would dynamically match multiple facts
based on their names.
Let say I have two types of facts; one representing the information that an
item (with a given name) exists, and the other one representing a list of items
(e.g., as a list of names in a multislot). It could be something like
this:
(deftemplate item (slot name))
(deftemplate bag-of-items (multislot names))
(assert (item (name A))
(assert (bag-of-items (names A B))
What I am trying to write is a rule that would, for any bag-of-items fact, fire
if all the items listed in the multislot 'name' are item facts that have been
asserted.
I am wondering if there is an easy way to do that, or if I'll need to hack my
way through it with loops and tests in the LHS of my rule.
Any suggestion?
Best,
Aurélien
--
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