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Re: stating that something doesn't exist

From: Alan Ruttenberg <alanruttenberg@gmail.com>
Date: Thu, 22 May 2008 23:28:22 -0400
Cc: <semantic-web@w3.org>
Message-Id: <6274B912-0B34-4C50-926A-2C7FC6C04E2C@gmail.com>
To: "Johnson, Matthew C. (LNG-HBE)" <Matthew.C.Johnson@lexisnexis.com>

On May 22, 2008, at 8:39 AM, Johnson, Matthew C. (LNG-HBE) wrote:

> [[MCJ]] I suppose that given the open world assumption, someone else
> would not know this unless there was an explicit mysch:notLinksTo
> assertion or one relied upon the interpretation of a query (that shows
> that mysch:linksTo does not exist between pub 2 and pub 3.  This is  
> what
> I'm coming around to anyway...  Perhaps I'm really struggling with the
> notion of open world assumptions vs. closed.  In SQL (closed world),  
> one
> frequently uses "select count(*) ..." in order to determine whether a
> relationship exists.  In the open web, I can understand that one  
> cannot
> assume that a given graph incorporates absolutely every statement  
> [about
> a given thing] but I wonder whether if it is ok to make such an
> assumption within one's own [possibly local/corporate] domain?  Would
> this be considered an abuse of OWL's and RDF's intent?

I think that one has to make one's own judgements. The intent of the  
open world assumption is to not make a global assumption for  
everybody. Certainly, if within your organization you are comfortable  
that you have adequate information to make decisions, no one is going  
to argue with that.

Received on Friday, 23 May 2008 03:29:04 UTC

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