W3C home > Mailing lists > Public > www-rdf-interest@w3.org > December 1999

RE: Certainty Factors

From: Didier PH Martin <martind@netfolder.com>
Date: Sat, 11 Dec 1999 14:51:24 -0500
To: <www-rdf-interest@w3.org>
Message-ID: <NBBBJPGDLPIHJGEHAKBAKEDNEJAA.martind@netfolder.com>
Hi Danny

Good point, The actual premisses behind the RDF specs is that property
ownership is governed by the set theory. What you are suggesting here is
that it would be governed by the fuzzy set theory. Is that what you had in

Didier PH Martin
Email: martind@netfolder.com
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-----Original Message-----
From: www-rdf-interest-request@w3.org
[mailto:www-rdf-interest-request@w3.org]On Behalf Of Danny Ayers
Sent: Friday, December 10, 1999 5:07 AM
To: www-rdf-interest@w3.org
Subject: Certainty Factors

I'm just wondering what angle the proposed RDF spec takes for dealing
with uncertainty, and the 'truth' of a statement. As an extreme case
let's have the assertion in one place (abstracting it a bit)

Object : Freddy's cat
Attribute : Colour
Value : Red

 and elsewhere we have the assertion
Object : Freddy's cat
Attribute : Colour
Value : Green

As I see it, there are essentially two approaches available - 1. there
is no need for implicit definition of certainty within RDF; 2. certainty
can be expressed in a RDF triple.

With 1, it could be left to a reasoning engine to determine which of
these statements is more likely to be true - following a chain of
authority perhaps, if the chain leads back to a document with Freddy as
the author, then we take his word on it.

With 2, we could have additional assertions along the lines of :

Object : The first statement about the colour of Freddy's cat
Attribute : Certainty
Value : 0.9

or even

Object : This document
Attribute : Certainty
Value : 0.01

Any thoughts on this?

I must confess that my knowledge of RDF is pre-pubescent, and apologies
if I've missed a relevant thread or document.


 Having looked at other knowledge representation methods in the past


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Received on Saturday, 11 December 1999 15:15:15 UTC

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