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Direct Graph Identification

From: Philip Fennell <Philip.Fennell@marklogic.com>
Date: Mon, 23 Jan 2012 06:14:53 -0800
To: "public-rdf-dawg-comments@w3.org" <public-rdf-dawg-comments@w3.org>
Message-ID: <D20C296D14127D4EBD176AD949D8A75A2055B82377@EXCHG-BE.marklogic.com>
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>


Regards

Philip
Received on Monday, 23 January 2012 14:15:25 GMT

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