Re: SPARQL vnext new feature? cascadedQueries

Well, that would be the obvious syntax for a local sub-query too.

- Steve

On 4 Nov 2007, at 12:48, Alan Ruttenberg wrote:

> 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 12:55:27 UTC