- From: Alan Ruttenberg <alanr@mumble.net>
- Date: Wed, 13 Aug 2008 19:17:15 -0400
- To: Dan Connolly <connolly@w3.org>
- Cc: Jonathan Rees <jar@creativecommons.org>, "www-tag@w3.org WG" <www-tag@w3.org>
Does this mean that the IRI following the GRAPH keyword also denotes a
document? Or that the same iri can denotes both a graph and its
serialization?
-Alan
On Aug 13, 2008, at 4:39 PM, Dan Connolly <connolly@w3.org> wrote:
>
> On Wed, 2008-08-13 at 14:16 -0400, Jonathan Rees wrote:
>> If I say, in SPARQL:
>>
>> select * from <http://example.com/graph1> { ... }
>>
>> then by my reading of the SPARQL rec (http://www.w3.org/TR/rdf-sparql-query/
>> ), http://example.com/graph1 is supposed to name a (named) graph. But
>> some SPARQL servers take the URI in a FROM or GRAPH clause and use it
>> with HTTP to fetch an RDF/XML or Turtle document, from which triples
>> are obtained. By the httpRange-14 resolution, the 200 response means
>> that the URI names an information resource.
>
> yes...
>
>> Therefore, at least some RDF graphs (or named graphs) are information
>> resources, right?
>
> Strictly speaking, not quite; the SPARQL
> spec includes this clarification:
>
> "The FROM NAMED syntax suggests that the IRI identifies the
> corresponding graph, but the relationship between an IRI and a graph
> in
> an RDF dataset is indirect. The IRI identifies a resource, and the
> resource is represented by a graph (or, more precisely: by a document
> that serializes a graph). For further details see [WEBARCH]."
>
>>
>> I'm sure this has been discussed before...
>>
>> Jonathan
>>
> --
> Dan Connolly, W3C http://www.w3.org/People/Connolly/
> gpg D3C2 887B 0F92 6005 C541 0875 0F91 96DE 6E52 C29E
>
>
Received on Thursday, 14 August 2008 01:45:18 UTC