Re: newbie question about sparql and 200

On Aug 14, 2008, at 12:11 AM, Dan Connolly wrote:

> 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.

If I understood what it says, I wouldn't have asked for  
clarification. Care to be a little more educational? Does  
"represents" mean awww:represents, the relation between what comes  
back over the wire when you do an http GET on a URI and what the URI  
denotes?

-Alan


>
>> -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 04:28:13 UTC