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Re: comments on RIF: important, needed, next steps

From: Chris Welty <cawelty@gmail.com>
Date: Fri, 28 Aug 2009 09:33:49 -0400
Message-ID: <4A97DCBD.8080501@gmail.com>
To: Benjamin Grosof <BenjaminG@vulcan.com>
CC: "'public-rif-comments@w3.org'" <public-rif-comments@w3.org>
Thanks for the comments, Ben.

While the RIF WG has no specific plans to create new dialects, we do seek 
"implementations" of FLD in the form of new dialect definitions that use it.

Please acknowledge receipt of this email to <mailto:public-rif-comments@w3.org> 
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-The RIF WG

Benjamin Grosof wrote:
 > Hi folks,
 >
 > Some comments on RIF are below.
 >
 > The current specification(s) and associated documents are a good job overall.
 > Let's keep up the steam in the home stretch.
 >
 > More salient is that this initial step of RIF BLD/Core/PRD/FLD is important.
 > It is needed by industry, research, and the web overall.
 > It is a  key step on the road to reduce fragmentation in the business rule 
industry and
 > semantic web/technology industry, and to have a number of benefits for customers.
 > See [3] for an industry roadmap analysis I did a couple years ago on this topic.
 >
 > After RIF becomes a Recommendation, there is more work to be done under the 
extensibility
 > framework (FLD) especially.
 >
 > PRD is a good initial step but essentially has a procedural operational 
semantics rather
 > than declarative model-theoretic semantics, thus is
 > not "fully" semantic in that sense and does not support interoperability 
nearly as
 > satisfactorily as logic dialects/approaches that do have such.
 >
 > Notably needed in extensions (i.e., new logic dialects) under FLD are two 
kinds of expressive features:
 >
 > 1. nonmonotonicity -- default negation, and then more expressive defaults.
 >
 > 2. actions -- conclusion-triggered external procedurally attached actions, 
and then events too,
 > similar to those  in production rules and Event-Condition-Action rules .
 >
 > In terms of "80-20" kinds of thinking, "80" percent of current and potential
 > commercial applications in the business rules and semantic technology sectors 
need nonmonotonicity and/or actions.
 >
 > These two features were identified as high priority at the time the Working 
Group was being chartered,
 > but have  not yet been incorporated into the Logic Dialects
 > that are detailed in the current RIF specifications.
 >
 > Much of the basis for such extensions under FLD is available in 
standardization-oriented KR
 > semantic rule designs  such as RuleML [1] and SILK [2].
 > These do have fully declarative, model-theoretic semantics.
 >
 > Indeed, the SILK effort by the group I lead at Vulcan is currently developing 
some such extensions,
 > with contractor partners that include BBN Technologies, Stony Brook 
University, and others.
 >
 > All that awaits is to get the current RIF stuff, done by the Working Group, 
out as an actual Recommendation.
 >
 > I think we should all be looking forward to that.
 > Relative quiet on the public comments etc. mailing lists mainly indicates 
lack of controversy, in my view.
 >
 > Sincerely,
 >    --Benjamin
 >
 >
 > [1] http://www.ruleml.org
 >
 > [2] http://silk.semwebcentral.org
 >
 > [3] http://www.mit.edu/~bgrosof/#EBRC2007Talk
Received on Friday, 28 August 2009 13:34:33 GMT

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