Although I don't want to modify the objects in my ontology (as I mentioned
in my previous message), I couldn't resist to put this principle aside in
order to test if the trick works. The deftemplate of the have predicate now
looks like this:
"(deftemplate MAIN::have extends MAIN::__fact \"$JAVA-OBJECT$
storyagents.storyworldontology.Have\"
(slot class (default <External-Address:jess.SerializablePD>))
(slot owner (default <External-Address:jess.SerializablePD>))
(slot ownerType (default <External-Address:jess.SerializablePD>))
(slot possession (default <External-Address:jess.SerializablePD>))
(slot possessionType (default <External-Address:jess.SerializablePD>))
(slot OBJECT (type 2048)))"
The corresponding class:
class Have implements Predicate
{
PhysicalObject possession;
HumanBeing owner;
Class possessionType;
Class ownerType;
}
(The setPossession and setOwner methods of this class update the
corresponding types by calling setPossessionType(possession.getClass()) and
setOwnerType(owner.getClass()) respectively)
Now when I try to perform the trick:
(defrule test-rule
(have (possessionType (class (call Class forName "Pencil"))))
=>
(printout t "I have a pencil" crlf)
)
I receive the error message "Bad slot value".
When I try:
(have (possessionType (call Class forName "Pencil")))
the same error shows up, and:
(have (possessionType ?pt&=(call Class forName "Pencil")))
results in "Can't use funcalls in backchained patterns MAIN::have"
Any ideas would be greatly appreciated.
Sander
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On
> Behalf Of [EMAIL PROTECTED]
> Sent: dinsdag 19 maart 2002 20:11
> To: [EMAIL PROTECTED]
> Subject: Re: JESS: Backward chaining definstance facts
<cut>
> OK, anyway, the trick is to use
>
> (have (possession-type (class (call Class forName
> "package.pencil"))))
>
> where you've got "(have (possession ?pencil <of type pencil>))"
> below. Then the need-have fact should have the posession-type slot
> filled in with the appropriate class object, which you can use to
> synthesize the "pencil" object and "have" fact.
<cut>
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