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Re: RDF Extensibility

From: Toby Inkster <tai@g5n.co.uk>
Date: Wed, 7 Jul 2010 12:57:40 +0100
To: Pat Hayes <phayes@ihmc.us>
Cc: Dan Brickley <danbri@danbri.org>, Linked Data community <public-lod@w3.org>, Semantic Web <semantic-web@w3.org>
Message-ID: <20100707125740.785ce7a8@miranda.g5n.co.uk>
On Tue, 6 Jul 2010 16:11:19 -0500
Pat Hayes <phayes@ihmc.us> wrote:

> The world doesn't have facts like that in it. Classes and properties  
> are intellectual constructs, not the stuff of reality. Hell, if a  
> particle can be a wave, then surely a class can be a property.
> Anyway, RDF doesn't make logical a priori rulings about these kind
> of metaphysical segregations. For example, xsd:Number is a class, a  
> property and an individual in RDF.

Indeed - but who has claimed that classes and properties are disjoint?
Although they may well overlap in some cases, foaf:Person still isn't a
property.

Without knowing the definition of foaf:Person, it's difficult to
conclude that foaf:Person is not a property. However, even without
knowing the definition of a literal, it is easy to conclude that it is
not a suitable node to be used as a property, so in my opinion, it is
sensible to state that triples containing a literal as the predicate
have no meaning (even though I think they should be syntactically
allowed).

-- 
Toby A Inkster
<mailto:mail@tobyinkster.co.uk>
<http://tobyinkster.co.uk>
Received on Wednesday, 7 July 2010 11:58:53 UTC

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