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EC logic--correction

From: Frank Manola <fmanola@mitre.org>
Date: Thu, 24 May 2001 08:30:12 -0400
Message-ID: <3B0CFED4.CE99A6B6@mitre.org>
To: jos.deroo.jd@belgium.agfa.com, Dan Brickley <danbri@w3.org>, w3c-rdfcore-wg@w3.org
Frank Manola wrote:
> I took the specific term from John Sowa's book "Knowledge
> Representation".  His web page is
> http://www.bestweb.net/~sowa/direct/index.htm, where there is a lot of
> material on various logic-related subjects (whether he discusses EC
> logic there explicitly I don't know, but he does describe the book, and
> he talks a lot about EC logic in the book).  EC logic is just logic with
> only the existential quantifier and the "and" Boolean connector.  It's
> the subset that relational database systems support (ignoring the closed
> world assumption).  It's also the subset you're using when you make a
> bunch of Dublin Core statements about a publication.

This is what comes of working late at night after a blood donation.  I
said EC logic is "the subset that relational database systems support". 
More precisely, it's the subset used to *represent* the information in
database systems, i.e., the data itself (tables, ground assertions). 
Languages like SQL add additional power on top of that foundation.


Frank Manola                   The MITRE Corporation
202 Burlington Road, MS A345   Bedford, MA 01730-1420
mailto:fmanola@mitre.org       voice: 781-271-8147   FAX: 781-271-8752
Received on Thursday, 24 May 2001 08:29:13 UTC

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