No, you're not doing anything wrong. Goal patterns in Jess's limited
backward-chaining implementation can't contain functions, just as the
rule compiler should be reporting to you.
On Aug 25, 2009, at 11:11 AM, Henschel, Jörg wrote:
Hi,
we are examining the use of backward chaining with Jess and have
come across a few point that we'd like to clarify.
Specifically, it seems that function calls are not possible in a
rules LHS, such as
(deftemplate Bunny)
(do-backward-chainning Bunny)
(defrule print-carrot-cout2
?app <- (Bunny (weight 11) {carrots > 15})
=>
(printout t "The carrot count is " ?app.carrots crlf)
)
Here, the ">" causes a problem.
So, at least in regards to operators, it seems that ==, !=, && are
possible, whereas ||, <>, <=, >= don't work.
Are we doing something drastically wrong, or is that a real
restriction of Jess' backward chaining capabilities?
Thanks for any input,
Joerg Henschel
---------------------------------------------------------
Ernest Friedman-Hill
Informatics & Decision Sciences, Sandia National Laboratories
PO Box 969, MS 9012, Livermore, CA 94550
http://www.jessrules.com
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