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Re: New Proposal (6.1) for GRAPHS

From: Charles Greer <cgreer@marklogic.com>
Date: Thu, 29 Mar 2012 09:25:26 -0700
Message-ID: <4F748CF6.2060305@marklogic.com>
To: Sandro Hawke <sandro@w3.org>
CC: public-rdf-wg <public-rdf-wg@w3.org>
I really like this solution and it seems to satisfy the use cases 
familiar to me from when I actually worked a lot with RDF in the wild.

One thing I'm tripping over though --  The scope of a TRIG document or 
RDF dataset in effect 'closes the world.'  Is the idea of "merge" only 
within a TRIG document/dataset?

I can only see two ways to really assert a graph literal -- either by 
sanctifying the boundaries of  a dataset, thereby making merges with 
external data problematic, or by signing bytes.  Am I missing something, 
as usual?

Charles


On 03/27/2012 07:23 PM, Sandro Hawke wrote:
> I've written up design 6 (originally suggested by Andy) in more
> detail.  I've called in 6.1 since I've change/added a few details that
> Andy might not agree with.  Eric has started writing up how the use
> cases are addressed by this proposal.
>
> This proposal addresses all 15 of our old open issues concerning graphs.
> (I'm sure it will have its own issues, though.)
>
> The basic idea is to use trig syntax, and to support the different
> desired relationships between labels and their graphs via class
> information on the labels.  In particular, according to this proposal,
> in this trig document:
>
>     <u1>  {<a>  <b>  <c>  }
>
> ... we only know that<u1>  is some kind of label for the RDF Graph<a>
> <b>  <c>, like today.  However, in his trig document:
>
>     {<u2>  a rdf:Graph }
>     <u2>  {<a>  <b>  <c>  }
>
> we know that<u2>  is an rdf:Graph and, what's more, we know that<u2>
> actually is the RDF Graph {<a>  <b>  <c>  }.  That is, in this case, we
> know that URL "u2" is a name we can use in RDF to refer to that g-snap.
>
> Details are here: http://www.w3.org/2011/rdf-wg/wiki/Graphs_Design_6.1
>
> That page includes answers to all the current GRAPHS issues, including
> ISSUE-5, ISSUE-14, etc.
>
> Eric has started going through Why Graphs and adding the examples as
> addressed by Proposal 6.1:
> http://www.w3.org/2011/rdf-wg/wiki/Why_Graphs_6.1
>
>       -- Sandro (with Eric nearby)
>
>


-- 
Charles Greer
Senior Engineer
MarkLogic Corporation
charles.greer@marklogic.com
Phone: +1 707 408 3277
www.marklogic.com

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Received on Thursday, 29 March 2012 16:25:50 GMT

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