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Re: the term "named graphs"

From: Sandro Hawke <sandro@w3.org>
Date: Wed, 02 May 2012 10:06:02 -0400
To: Pat Hayes <phayes@ihmc.us>
Cc: Jeremy Carroll <jeremy@topquadrant.com>, public-rdf-wg@w3.org
Message-ID: <1335967562.27977.120.camel@waldron>
On Wed, 2012-05-02 at 01:22 -0500, Pat Hayes wrote:
> The SPARQL rec document has 39 occurrences of the phrase "named graph". The first 38 of them are ambiguous, and can be read either way (the named graph is a graph or a <name, graph> pair.) However, the last, in section 12.1.2, is quite clear:

You really went through them all?   Wow.

Here's my proposed consensus text about the term Named Graphs:

http://dvcs.w3.org/hg/rdf/raw-file/default/rdf-layers/index.html#named-graph

    -- Sandro

> -------
> 
> Definition: RDF Dataset
> An RDF dataset is a set:
> { G, (<u1>, G1), (<u2>, G2), . . . (<un>, Gn) }
> where G and each Gi are graphs, and each <ui> is an IRI. Each <ui> is distinct.
> 
> G is called the default graph. (<ui>, Gi) are called named graphs.
> 
> -------
> 
> Pat
> 
> On Apr 27, 2012, at 12:45 PM, Jeremy Carroll wrote:
> 
> > On 4/27/2012 1:44 AM, Antoine Zimmermann wrote:
> >> Remember that "named graph" is normative as it's part of a normative section of the SPARQL recommendation.
> > 
> > I just looked this up, and the definition seems to be in section 8
> > http://www.w3.org/TR/2008/REC-rdf-sparql-query-20080115/#rdfDataset
> > "An RDF Dataset comprises one graph, the default graph, which does not have a name, and zero or more named graphs, where each named graph is identified by an IRI."
> > 
> > This wording seems to me to suggest that G is a named graph if and only if there is a pair
> > 
> > (u, G)
> > 
> > in the dataset.
> > 
> > JeremyThe SP
> > 
> > 
> 
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Received on Wednesday, 2 May 2012 14:06:15 GMT

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