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Re: [TF-ENT] Querying datasets with default plus named graphs

From: Steve Harris <steve.harris@garlik.com>
Date: Thu, 8 Oct 2009 11:41:43 +0100
Message-Id: <AEAD42C2-A2D3-4274-916B-974FE88A7CC5@garlik.com>
To: "public-rdf-dawg@w3.org Group" <public-rdf-dawg@w3.org>
On 8 Oct 2009, at 11:34, Birte Glimm wrote:
>
>> It also raises an issue on the RIF side. RIF rules cannot be  
>> expressed in
>> RDF. How would one add RIF rules to an entailement regime if we  
>> wanted to
>> cover RIF? It might be a showstopper for that case:-(
>
> In my total RIF naivity, I would assume you can say:
>
> SELECT ?o FROM <http://example.org/myrules.rif> WHERE { :s :p ?o . }
>
> Here I assume that myrules.rif contains the rules and references
> (imports) for the relevant RDF graphs. In the RIF OWL compatibility
> doc it says:

I think that would limit the answers to being from triples that are in  
the .rif file, which if it's not RDF would be nothing.

But, I would have thought you could tell the store to apply RIF to  
some graph(s) - just like you would apply OWL/RDFS/whatever, using an  
external mechanism. Then query over those graphs as you would for any  
other entailment regime.

I may well be misunderstanding the problem though.

- Steve

-- 
Steve Harris
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Received on Thursday, 8 October 2009 10:42:14 GMT

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