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Re: Contradicting definitions of “property”

From: Pat Hayes <phayes@ihmc.us>
Date: Sat, 28 Apr 2012 10:26:06 -0500
Cc: Richard Cyganiak <richard@cyganiak.de>, RDF Working Group WG <public-rdf-wg@w3.org>, Simon Reinhardt <simon.reinhardt@koeln.de>
Message-Id: <478365B6-2054-407D-80D7-EA784D9EF963@ihmc.us>
To: David Wood <david@3roundstones.com>
Agreed.

Pat

On Apr 27, 2012, at 10:24 AM, David Wood wrote:

> Thanks, Richard.  I think your solution is correct.
> 
> Regards,
> Dave
> 
> 
> 
> 
> On Apr 25, 2012, at 20:00, Richard Cyganiak wrote:
> 
>> All,
>> 
>> Simon Reinhardt spotted [1] a nice little contradiction between the 2004 versions of RDF Concepts and RDF Semantics.
>> 
>> RDF Concepts states, in a normative section [2]:
>> 
>> [[
>> The predicate is also known as the property of the triple.
>> ]]
>> 
>> Where “predicate” is defined as a URIref, one of the three components of a triple. RDF Semantics, on the other hand, defines [3]:
>> 
>> [[
>> A simple interpretation I of a vocabulary V is defined by … a set IP, called the set of properties of I.
>> ]]
>> 
>> And the rest of the mechanics make it clear that URIrefs can denote a member of IP. In other words, RDF Concepts says that the predicate IRI *is* the property, while RDF Semantics says that it *denotes* the property.
>> 
>> The analogy with classes shows IMO that RDF Concepts is wrong and RDF Semantics is right. The IRI <http://xmlns.com/foaf/0.1/Person> *is* not a class, but it *denotes* a class.
>> 
>> I therefore deleted the normative definition quoted above from the RDF Concepts ED. If you disagree with this change or see further need to discuss this, then please respond.
>> 
>> Note that the new Introduction section in the RDF Concepts ED contains an *informative* sentence that introduces the term “property” [4], and it is in line with RDF Semantics:
>> 
>> [[
>> The predicate itself is an IRI and denotes a binary relation, also known as a property.
>> ]]
>> 
>> Best,
>> Richard
>> 
>> 
>> [1] http://lists.w3.org/Archives/Public/public-rdf-comments/2012Mar/0008.html
>> [2] http://www.w3.org/TR/2004/REC-rdf-concepts-20040210/#section-triples
>> [3] http://www.w3.org/TR/2004/REC-rdf-mt-20040210/#gddenot
>> [4] http://dvcs.w3.org/hg/rdf/raw-file/default/rdf-concepts/index.html#dfn-property
> 
> 
> 

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Received on Saturday, 28 April 2012 15:26:43 UTC

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