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
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