Re: SPARQL vnext new feature? cascadedQueries

Although I intended that the specification of this was that it was  
only legal for an endpoint, as that's what makes it easy. I'm not  
sure it's a useful construct otherwise, as you don't need it nested  
in the FROM if you have to download the file.
-Alan


On Nov 4, 2007, at 7:38 AM, Alan Ruttenberg wrote:

> Good point. Perhaps FROM ENDPOINT.
>
> -Alan
>
> On Nov 4, 2007, at 7:35 AM, Steve Harris wrote:
>
>> On 4 Nov 2007, at 04:09, Alan Ruttenberg wrote:
>>
>>> This is a particularly easy one, since it adds no new  
>>> expressivity. The form
>>> below can be syntactically transformed into SPARQL as specified  
>>> now by way
>>> of using the SPARQL protocol for the construct in the FROM.
>>> Since this is the only reasonable way we have to do federation  
>>> now, within
>>> spec, it's more like adding friendly syntactic sugar.
>>
>> As far as I can tell there's no way to tell that <http:// 
>> example.com/sparql?> is a SPARQL endpoint, rather that a graph  
>> served by a CGI script with no arguments.
>>
>> - Steve
>>
>>> On 11/3/07, Dan Connolly <connolly@w3.org> wrote:
>>>>
>>>> Alan Ruttenberg wrote:
>>>>>
>>>>> SELECT ?a ?b
>>>>>  FROM ( CONSTRUCT { ?d <b> ?b }
>>>>>                          FROM < http://example.com/sparql?>
>>>>>                        WHERE { ?b <b> ?d } )
>>>>> WHERE { ?a <b> ?b }
>>>>
>>>>
>>>> Yes... the Data Access WG considered this sort of thing briefly;
>>>> we didn't see any particular reason not to do it but we...
>>>>
>>>> RESOLVED 2005-01-20: to postpone cascadedQueries; while  
>>>> federation use
>>>> cases are interesting, the designs don't seem mature and the use  
>>>> cases
>>>> are not urgent; with KendallC abstaining.
>>>> http://www.w3.org/2001/sw/DataAccess/issues#cascadedQueries
>>>>
>>>> I'm happy to see people playing around with it; I hope the
>>>> designs get mature soonish.
>>>>
>>>>
>>>> --
>>>> Dan Connolly, W3C http://www.w3.org/People/Connolly/
>>>>
>>>>
>>
>

Received on Sunday, 4 November 2007 12:48:05 UTC