From: Christian De Sainte Marie <csma@fr.ibm.com>

Date: Tue, 10 Jul 2012 19:32:50 +0200

To: public-rif-comments@w3.org, Ankesh <ankesh@gmail.com>

Message-ID: <OFE98BEB63.8458AE62-ONC1257A37.005DAB1F-C1257A37.00606746@fr.ibm.com>

Date: Tue, 10 Jul 2012 19:32:50 +0200

To: public-rif-comments@w3.org, Ankesh <ankesh@gmail.com>

Message-ID: <OFE98BEB63.8458AE62-ONC1257A37.005DAB1F-C1257A37.00606746@fr.ibm.com>

Hi Ankesh, Ankesh wrote, on Fri, 18 Mar 2011 16:49:37 -0400: > > The semantics of the Assert atomic action is described as follows at [1]: > > Rule 1 says that *all the condition formulas that were satisfied before an > assertion will be satisfied after*, and that, in addition, the condition > formulas that are satisfied by the asserted ground formula will be satisfied > after the assertion. No other condition formula will be satisfied after the > execution of the action. > > where, Rule 1 is formally defined as: > ¦Á is Assert(¦Õ), where ¦Õ is a ground atomic formula, and *w' = w ¡È {¦Õ}*; > > I am guessing that "condition formulas" refers to formulas described at [2].. > In that case an assertion could change the satisfaction of negation formula, > right? ie. a negation formula may be satisfied in w but not in w'. Does this > violate the description above. Kindly explain. > > [1] http://www.w3.org/TR/rif-prd/#Operational_semantics_of_atomic_actions > [2] http://www.w3.org/TR/rif-prd/#Formulas You are perfectly right and the text explanation of the formal definition is wrong: it applies only to atomic condition formulas, not general ones. We will correct the wording in the 2nd edition. > (A similar argument follows for Rule 2) Indeed. > Furthermore, the formal definition doesn't mention conditional formula while > the description (referred above) does. Is something missing there? Nothing is really missing, but the formal definitions are not rigorous enough, as they confuse the states of the fact base and the sets of ground atomic formulas that represent them. This will be clarified in the revised edition. Thanx for your comment. Cheers, Christian IBM 9 rue de Verdun 94253 - Gentilly cedex - FRANCE Tel./Fax: +33 1 49 08 29 81 Sauf indication contraire ci-dessus:/ Unless stated otherwise above: Compagnie IBM France Si¨¨ge Social : 17 avenue de l'Europe, 92275 Bois-Colombes Cedex RCS Nanterre 552 118 465 Forme Sociale : S.A.S. Capital Social : 645.605.931,30 € SIREN/SIRET : 552 118 465 03644 - Code NAF 6202AReceived on Tuesday, 10 July 2012 17:33:30 GMT

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