- From: Dan Connolly <connolly@w3.org>
- Date: Wed, 13 Aug 2008 23:11:23 -0500
- To: Alan Ruttenberg <alanr@mumble.net>
- Cc: Jonathan Rees <jar@creativecommons.org>, "www-tag@w3.org WG" <www-tag@w3.org>
On Wed, 2008-08-13 at 19:17 -0400, Alan Ruttenberg wrote:
> 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?
No. It just means what it says.
> -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 04:11:51 UTC