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Re: Direct Graph Identification

From: Chimezie Ogbuji <chimezie@gmail.com>
Date: Tue, 5 Jun 2012 08:38:30 -0400
Message-ID: <CAKSO3u=41K3+T1i9KdK_zTi1Ot4Uk8inn2oQ=+2h_L93pxpyWA@mail.gmail.com>
To: Philip Fennell <Philip.Fennell@marklogic.com>, public-rdf-dawg-comments@w3.org
Philip,

Yes, this is correct, assuming

   http://example.com/rdf-graphs

Identifies a Graph Store managed by an HTTP service that is an
implementation of this protocol and

   http://example.com/rdf-graphs/employees

is the graph IRI associated with an RDF graph within that Graph Store

We would be grateful if you would acknowledge that your comments have
been answered by sending a reply to this mailing list.

Regards,

Chime Ogbuji, on behalf of the SPARQL WG.

On Mon, 23 Jan 2012 at 06:14,  Philip Fennell wrote:
> I've had a quick look in the archive but have not found anything the immediately answers my questions, which is:
> I'm not sure I understand the distinction between Direct Graph Identification and Indirect Graph Identification that uses the graph request parameter to identify a named
> graph.

> With respect to Direct Graph Identification (section 4.1 of the SPARQL 1.1 Graph Store HTTP Protocol) can I deduce from the following statements:

> 'Per [RFC2616]<http://www.w3.org/TR/sparql11-http-rdf-update/>, the most common usage of a Request-URI is to identify a resource on an origin server or gateway. In our
> example, the corresponding request URI (http://example.com/rdf-graphs/employees) is meant to identify RDF triples on the example.com server that describe employees. In
> addition, the request specifies the GET method, which means that a representation of these triples should be returned. In this case, the preferred representation format is
> application/rdf+xml

> In this way, the server would route operations on a named graph in an Graph Store via its Graph IRI. However, in using a URI in this way, we are not directly identifying an
> RDF graph but rather the RDF graph content that is represented by an RDF document, which is a serialization of that graph. Intuitively, the set of interpetations that satisfy
> [RDF-MT]<http://www.w3.org/TR/sparql11-http-rdf-update/> the RDF graph that the RDF document is a serialization of can be thought of as this RDF graph content.'

> that by using 'Direct Graph Identification', the graph content that you would be addressing with:
> <http://example.com/rdf-graphs/employees>
> is a 'Named Graph' and an equivalent request would be, for example:
> <http://example.com/rdf-graphs?graph= http%3A%2F%2Fexample.com%2Frdf-graphs%2Femployees>
Received on Tuesday, 5 June 2012 12:39:19 GMT

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