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Re: New Proposal (6.1) for GRAPHS

From: Peter F. Patel-Schneider <pfpschneider@gmail.com>
Date: Wed, 28 Mar 2012 10:10:01 -0400
Message-ID: <4F731BB9.7050000@gmail.com>
To: Sandro Hawke <sandro@w3.org>
CC: public-rdf-wg <public-rdf-wg@w3.org>
Wow!

The graph semantics includes quite a bit of new stuff:

owl:sameAs as equality
functional relationships
partially reflexive relationships

The special status of the rdf:Graph class is rather unusual.

The proposal leaves open just what an RDF graph is in the semantics.  Is it 
just a graph (so that its syntax matters), or is it a set of interpretations 
(so that what matters is its RDF meaning)?


peter


On 03/27/2012 10:23 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)
>
>
Received on Wednesday, 28 March 2012 14:10:43 GMT

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