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Re: TriG and default graphs

From: Steve Harris <steve.harris@garlik.com>
Date: Thu, 25 Oct 2012 14:53:32 -0600
Cc: public-rdf-wg@w3.org
Message-Id: <EDC26FE1-3D0E-4F10-81D3-D11C4B54FFD6@garlik.com>
To: Andy Seaborne <andy.seaborne@epimorphics.com>
On 25 Oct 2012, at 09:20, Andy Seaborne wrote:
> 
> On 25/10/12 15:25, Steve Harris wrote:
>> In principle I'm +1 on this, but we don't use default/anonymous graphs either, so I'd like to hear from people who do. Would this would be an OK solution?
>> 
> 
> what are you suggesting?
> 
> - TriG not to have a default graph
> or
> - making the examples of metadata not use the default graph.

I wasn't suggesting either - I was wondering what the impact of not having an explicit syntax for representing the default graph would be on users of systems like that.

- Steve

> 	Andy
> 
>> It would certainly simplify the spec text, and it would make the parallel with NQuads more obvious.
>> 
>> I have no feel for how many TriG files there out in the wild with anonymous graph contents.
>> 
>> - Steve
>> 
>> On 24 Oct 2012, at 17:29, Yves Raimond wrote:
>> 
>>> Hello!
>>> 
>>> Just jumping on the last point that was mentioned in today's telecon, about possibly not providing any statements about what to do with a TriG default graph. I have the feeling that not doing that actually defeats the point of having a default graph at all.
>>> 
>>> If we can't get to an agreement on that first point, I'd really like to understand what the rationale is behind supporting default graphs in TriG, apart from backward-compatibility. When used at the BBC, default graphs have proven to be a very confusing feature, and not having any statement on what do with them would only add to the confusion.
>>> 
>>> All the dataset metadata that is supposed to go in that default graph could perfectly go in another named graph, e.g. identified by the URI of the sd:Dataset in the SPARQL end-point you're generating a TriG dump from, or the URI of the TriG file itself. Personally, I'd favour a 'flat' version of TriG, where everything is a named graph.
>>> 
>>> Best,
>>> Yves
>>> 
>>> 
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> 

-- 
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Received on Thursday, 25 October 2012 20:54:05 GMT

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