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Re: [ontolog-forum] Semantic patterns and logic expression

To: "'[ontolog-forum] '" <ontolog-forum@xxxxxxxxxxxxxxxx>
From: "Patrick Cassidy" <pat@xxxxxxxxx>
Date: Sun, 21 Feb 2010 18:52:24 -0500
Message-id: <023101cab350$eaa4b9a0$bfee2ce0$@com>


   OWL and other description logics are definitely restricted in what they can express, but FOL  is pretty flexible.  Perhaps you can provide an example of a case where you couldn’t express something you wanted to say in FOL?




Patrick Cassidy



cell: 908-565-4053



From: ontolog-forum-bounces@xxxxxxxxxxxxxxxx [mailto:ontolog-forum-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Jim Rhyne
Sent: Sunday, February 21, 2010 1:58 PM
To: [ontolog-forum]
Subject: [ontolog-forum] Semantic patterns and logic _expression_


I frequently have to define a semantic pattern, but find that it cannot be expressed in the current versions of DL, or OWL Full, or in FOL.

An example is what linguists call “co-occurrence restrictions”. For instance, one cannot be one’s own uncle. If you try to express this in OWL-DL for example, as a property chain (father’s brother) that is irreflexive, you’ve violated the semantic constraints on OWL-DL models. The pattern can be expressed in OWL Full and in FOL.

A serious search of the web for a catalog of such patterns and their _expression_ (or lack of it)  in the various families of logics has not produced anything.

Is this a concern to others on this list? Have I overlooked something?




Jim Rhyne

Software Renovation Consulting

Los Gatos, California

408 309 0353



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