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RE: [SKOS, SPARQL, ALL] Closure and SPARQL

From: Christoffel Dhaen <christoffel@landcglobal.com>
Date: Thu, 8 Dec 2005 15:09:52 +0100
Message-ID: <28A0FFC7AEF0014AA8C2CE543AE13F5B53D2D5@x-box.quest.net>
To: "Enrico Franconi" <franconi@inf.unibz.it>
Cc: "McBride, Brian" <brian.mcbride@hp.com>, "Christopher Welty" <welty@us.ibm.com>, <public-swbp-wg@w3.org>, <public-swbp-wg-request@w3.org>


As far as I know, RDF does not allow you to state that a property is transitive, but the RDF schema itself has 2 transitive properties: rdfs:subClassOf and rdfs:subPropertyOf.

I could be horribly wrong here, but one of the use-cases listed is:
"2.17 Building Ontology Tools (Semantic Web)"
It says: "Some parts of the ontology editor require the transitive closure of the query and other parts do not."

Imho, a lot of applications will require the transitive closure of the query.
I don't think I said that RDF and OWL express transitive closure, but they do express transitivity. And indeed, the transitive closure of the transitive properties is what I would expect to find in a query language for RDF.
I would have expected that this was covered in SPARQL, seems like it isn't... or did I somehow miss that?

Christoffel




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-----Original Message-----
From: Enrico Franconi [mailto:franconi@inf.unibz.it] 
Sent: donderdag 8 december 2005 14:35
To: Christoffel Dhaen
Cc: McBride, Brian; Christopher Welty; public-swbp-wg@w3.org; public-swbp-wg-request@w3.org
Subject: Re: [SKOS, SPARQL, ALL] Closure and SPARQL

On 8 Dec 2005, at 12:07, Christoffel Dhaen wrote:
> In Rdf, Owl and SKOS there is such a thing native to the format,

Uh? Where is the transitive closure of a property in RDF and OWL? OWL  
has transitive properties - not transitive closure of a property  
which is what you want in a query language. RDF does not have  
anything like transitive properties either.
--e.


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