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Re: [ontolog-forum] Ontology-based database integration

To: "[ontolog-forum] " <ontolog-forum@xxxxxxxxxxxxxxxx>
From: Christopher Menzel <cmenzel@xxxxxxxx>
Date: Sun, 11 Oct 2009 15:08:22 -0500
Message-id: <E510A8DF-EE88-4225-880F-F800971F89A0@xxxxxxxx>
On Oct 9, 2009, at 11:12 AM, John F. Sowa wrote:
> XSB is a freely available logic-programming system that uses  
> classical negation.    (01)

IIRC, XSB is based on so-called well-founded semantics for logic  
programming languages (WFS), which does not in general guarantee that  
a consistent set of sentences has a model in which every sentence  
receives a truth value; i.e., negation isn't guaranteed to be  
classical. I don't think this affects the point your were making.    (02)

-chris    (03)

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