Jess versions prior to 6.x do not support the OR conditional element;
looks like you're using 5.x . In general, Jess supports precisely what
is described in the manual that comes with it; nothing more, nothing less.
I think Mike Leiper wrote:
> Hello Jess Users,
>
> I'm new to JESS and playing with templates and rules. I'm trying to
> create a
> rule that performs and 'or' on two facts:
>
> ; Fact Templates
> (deftemplate gross "gross product"
> (slot value (type INTEGER))
> )
>
> (deftemplate cost "cost product"
> (slot value (type INTEGER))
> )
>
> ;Complex Alerts Alerts of Alerts
> (defrule Example_OR_Alert
> (or (gross (value ?x))
> (cost (value ?y)))
> =>
> ; (send-alert 46 2 2)
> (printout t "Complex_Alert 100 " crlf)
> )
>
> JESS does not accept my rule definition. I receive the following error
> message:
>
> Jess reported an error in routine Jesp.parsePattern while executing
> (batch "templates1.txt").
> Message: Bad slot value .
> Program text: ( defrule Example_OR_Alert ( or ( at line 12.
> jess.Value jess.Jesp.parseSexp()
> jess.Value jess.Jesp.parse(boolean)
> void jess.Main.execute(boolean)
> void jess.ConsoleApplet.run()
> void java.lang.Thread.run()
>
> If someone could please help me with my rule definition using the 'or'
> function, I would greatly appreciate it.
>
> Thank you,
> mike
>
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---------------------------------------------------------
Ernest Friedman-Hill
Distributed Systems Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
Org. 8920, MS 9012 [EMAIL PROTECTED]
PO Box 969 http://herzberg.ca.sandia.gov
Livermore, CA 94550
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