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Re: [SKOS] Amsterdam topic "Semantic Relation Properties"

From: Sean Bechhofer <sean.bechhofer@manchester.ac.uk>
Date: Fri, 5 Oct 2007 13:23:49 +0100
Message-Id: <A1B44B44-89C6-44FF-B8EE-E0D0795FBB8C@manchester.ac.uk>
Cc: "Thomas Baker" <baker@sub.uni-goettingen.de>, "SWD Working Group" <public-swd-wg@w3.org>, <public-esw-thes@w3.org>
To: "Miles, AJ \(Alistair\)" <A.J.Miles@rl.ac.uk>

On 5 Oct 2007, at 12:39, Miles, AJ ((Alistair)) wrote:

> Hi all,
> Sorry again for being too late for the meeting packet.
> As input to the "Semantic Relation Properties" topic, I've written  
> a strawman semantics for skos:broader, skos:narrower and  
> skos:related ...
> [1] <http://www.w3.org/2006/07/SWD/wiki/SkosDesign/ 
> SemanticRelations/MinimalProposal?action=recall&rev=6>
> As with the other strawmen, this proposal tries to make the least  
> ontological commitment, and cater for the different needs of our  
> use cases.
> As I see it, the main decision points for this topic are:
>  * skos:broader is transitive? (yes/no/maybe)
>  * skos:broader is intransitive? (yes/no/maybe)
>  * skos:broader is reflexive? (yes/no/maybe)
>  * skos:broader is irreflexive? (yes/no/maybe)
>  * skos:broader cycles are an error? (yes/no/maybe)
> [1] answers "maybe" to all five questions, to give the most  
> flexibility; everything else should not be contentious.

This also means that skos:broader MAY be interpreted as a reflexive  
property (every conceptual resource is broader than itself). This  
would necessarily follow from asserting that rdfs:subClassOf is a sub- 
property of skos:broader (see also [@@TODO SKOS+OWL Patterns]).

I don't believe that this is the case. Asserting that rdf:subClassOf  
is a sub-property of skos:broader doesn't mean that skos:broader is  
necessarily reflexive.


Sean Bechhofer
School of Computer Science
University of Manchester
Received on Friday, 5 October 2007 12:24:42 UTC

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