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Re: SPARQL queries: predicates, dumps, abouts etc

From: Charles McCathieNevile <charles@sidar.org>
Date: Mon, 09 May 2005 13:18:41 +0200
To: "Jeen Broekstra" <jeen@aduna.biz>, "conor dowling" <conor@the325project.org>
Cc: semantic-web@w3.org
Message-ID: <op.sqh9pfw0w5l938@pc048.qadoc.oslo.opera.com>

On Mon, 09 May 2005 12:57:16 +0200, Jeen Broekstra <jeen@aduna.biz> wrote:

Conor had asked
>> 3) Types - just like any other predicate?
>>      SELECT *
>>     WHERE { ?subject rdf:type ?type }
>>  will give me all of the types of all of the resources - right?

>  Yes. Although you should keep in mind that SPARQL itself makes no
> guarantees as to how much of the RDF(S) semantics is used. That is up
> to the implementation. So a very naive SPARQL implementation will only
> return the types of the resources for which this type is explicitly
> defined in the data, other implementations, that do RDF(S) inferencing
> will return all types for all resources.

So is there any standard way of asking a SPARQL implementation whether it  
does RDFS sub* inferencing?



Charles McCathieNevile                      Fundacion Sidar
charles@sidar.org   +61 409 134 136    http://www.sidar.org
Received on Monday, 9 May 2005 11:17:44 UTC

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