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Re: a "modest proposal" for PRD

From: Hassan At-Kaci <hak@ilog.com>
Date: Wed, 20 Feb 2008 10:55:10 +0100
Message-ID: <47BBF8FE.1080006@ilog.com>
To: Gary Hallmark <gary.hallmark@oracle.com>
CC: W3C RIF WG <public-rif-wg@w3.org>

Gary Hallmark wrote:
> Start with exactly the BLD syntax.  Add just 1 or 2 "hard" things (e.g. 
> retraction and rule priority) that are common in PR and make a model 
> theory very difficult.  Do not respecify the syntax, just add the new 
> elements.  Develop an Operational Semantics for it, as defined by 
> Plotkin in http://homepages.inf.ed.ac.uk/gdp/publications/sos_jlap.pdf.  
> Do not spend time on informal semantics that can only diverge from the 
> formal semantics.  Only after PRD has caught up with BLD in terms of 
> semantic rigor should it incorporate negation, aggregation, other 
> actions, etc.
> The task of developing a formal Operational Semantics for PRD is not 
> trivial and would be best attempted by someone who has done something 
> similar before.

Well said ... I fully agree.

Hassan At-Kaci  *  ILOG, Inc. - Product Division R&D
Received on Wednesday, 20 February 2008 09:56:10 UTC

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