RE: [jade-develop] Simple Question: negative expression

Subject: RE: [jade-develop] Simple Question: negative expression
From: Caire Giovanni (Giovanni.Caire@TILAB.COM)
Date: Tue Nov 05 2002 - 14:43:10 MET

Hi,
 
You can use the NOT operator of the SL language. Something like:
 
Predicate p = // construct the predicate you want to negate
AbsPredicate not = new AbsPredicate(SLVocabulary.NOT);
not.set(SLVocabulary.NOT_WHAT, myOntology.fromObject(p));
myContentManager.fillContent(msg, not);
 
Note that, since there are a lot of SL operators, we diceded not to implement a Java class for each of them --> This is why you have to use abstract descriptors.
 
Bye
 
Giovanni

-----Original Message-----
From: Marco Alessi [mailto:alessi@eng.it]
Sent: marted́ 5 novembre 2002 12.06
To: jade-develop@sharon.cselt.it
Subject: [jade-develop] Simple Question: negative expression

Hi All!!!
I apologize for my english!!!!
 
I'm doing Seller-Buyer example, and I'm wondering how to express,in java language using SL-Language ,a negative expression of a predicate like "to own" some Item, that is "NOT OWN ITEM", as for example using SL:
 
 
:content(( not (owns (item))))
 
I have to define a generic Class FalseProposition() that implements a method that gets the content message and sets it false ???
 
 
Any ideas?
Sorry about my ignorance!!!

Hi,
 
You can use the NOT operator of the SL language. Something like:
 
Predicate p = // construct the predicate you want to negate
AbsPredicate not = new AbsPredicate(SLVocabulary.NOT);
not.set(SLVocabulary.NOT_WHAT, myOntology.fromObject(p));
myContentManager.fillContent(msg, not);
 
Note that, since there are a lot of SL operators, we diceded not to implement a Java class for each of them --> This is why you have to use abstract descriptors.
 
Bye
 
Giovanni
-----Original Message-----
From: Marco Alessi [mailto:alessi@eng.it]
Sent: marted́ 5 novembre 2002 12.06
To: jade-develop@sharon.cselt.it
Subject: [jade-develop] Simple Question: negative expression

Hi All!!!
I apologize for my english!!!!
 
I'm doing Seller-Buyer example, and I'm wondering how to express,in java language using SL-Language ,a negative expression of a predicate like "to own" some Item, that is "NOT OWN ITEM", as for example using SL:
 
 
:content(( not (owns (item))))
 
I have to define a generic Class FalseProposition() that implements a method that gets the  content message and sets it false ???
 
 
Any ideas?
Sorry about my ignorance!!!

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