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Re: AW: [PRD] Assert and AssertRetract test cases (ACTION-845)

From: Changhai Ke <changhai.ke@fr.ibm.com>
Date: Tue, 21 Jul 2009 17:08:47 +0200
To: Christian De Sainte Marie <csma@fr.ibm.com>
Cc: "Adrian Paschke" <adrian.paschke@gmx.de>, "'RIF'" <public-rif-wg@w3.org>, public-rif-wg-request@w3.org
Message-ID: <OFAB243080.19932811-ONC12575FA.005248B8-C12575FA.00533360@fr.ibm.com>
Christian,

Yes we should allow an retracted object to be re-asserted.

Note: we should not consider a retracted object as "deleted", retraction 
removes all the references to be object from the rule system, but the 
target application can still keep the object.

But back to Adrian's test case, the retract should remove all the 
attributes of the frame. When "Assert (?X[ex:discount -> "0"]) " is 
executed, the frame should have the only attribute: discount -> 0.

Then how can we obtain the result: "ex:john[ex:status -> "normal" 
ex:discount -> "0"] "? What do you think?

Changhai



From:
Christian De Sainte Marie/France/IBM@IBMFR
To:
"Adrian Paschke" <adrian.paschke@gmx.de>
Cc:
"'RIF'" <public-rif-wg@w3.org>
Date:
21/07/2009 16:07
Subject:
Re: AW: [PRD] Assert and AssertRetract test cases (ACTION-845)
Sent by:
public-rif-wg-request@w3.org




"Adrian Paschke" <adrian.paschke@gmx.de> wrote on 21/07/2009 15:48:27:
> 
> That was exactly the intention, to demonstrate that you can simulate
> modify by a assert+retract combination. 

Then, the test case should be modified. The equivalent to: 

Forall ?X ( 
  If ?X[ex:status -> "normal" ex:discount -> "10"] 
  Then Do ( Modify(?X[ex:discount -> "0"]) 

would be (modulo the atomicity): 

Forall ?X ( 
  If ?X[ex:status -> "normal" ex:discount -> "10"] 
  Then Do ( Retract (?X[ex:discount -> "10"]) 
                  Assert (?X[ex:discount -> "0"]) 

But the questionraised by the original version of your test case remains: 
do we allow a frame about an object to be asserted after that object has 
been retracted? 

Cheers, 

Christian 

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Sauf indication contraire ci-dessus:/ Unless stated otherwise above:
Compagnie IBM France
Siège Social : Tour Descartes, 2, avenue Gambetta, La Défense 5, 92400 
Courbevoie
RCS Nanterre 552 118 465
Forme Sociale : S.A.S.
Capital Social : 609.751.783,30 €
SIREN/SIRET : 552 118 465 02430


Received on Tuesday, 21 July 2009 15:10:19 GMT

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