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Re: No way to specify an RDF dataset of all the known named graphs [OK?]

From: Simon Raboczi <raboczi@gmail.com>
Date: Tue, 17 Apr 2007 03:20:49 +1000
Message-Id: <62907FC5-BFFD-4BCC-985E-A71E4890953C@itee.uq.edu.au>
Cc: ogbujic@ccf.org
To: public-rdf-dawg-comments@w3.org

Chimezie Ogbuji wrote on 2007-04-04:

 > SPARQL currently does not provide an unambiguous way to specify a
 > dataset which corresponds to all the known named graphs.  The only  
way
 > this can be done is to leave out FROM <..> and FROM NAMED <..>
 > directives in the prolog (and from the protocol, for SPARQL  
services).
 > The corresponding dataset in this case depends on the host  
application -
 > not very consistent.

Firstly, thank you for your comments [1] suggesting how SPARQL could  
be improved by adding a "FROM NAMED *" syntax.  It was discussed at  
the 2007-04-10 teleconference [2], but the working group is very  
conservative about adding features at this Last Call stage and  
decided to err on the side of caution and not add this feature at  
this time.

Note however that the working group does has two postponed issues:  
service description [3] and cascaded queries [4].  It was suggested  
during the meeting that these two facilities in combination may allow  
a future version of SPARQL to query the endpoint's own service  
description to determine its known named graphs, which could then be  
used as the dataset for a subsequent query.

I hope this message addresses your comments to your satisfaction.  If  
it does, please let us know by replying to this message to say so. If  
you change the subject line to include [CLOSED] it will help the  
scripts used for tracking comments.

[1] http://lists.w3.org/Archives/Public/public-rdf-dawg-comments/ 
2007Apr/0001.html
[2] http://www.w3.org/2007/04/10-dawg-minutes.html
[3] http://www.w3.org/2001/sw/DataAccess/issues#serviceDescription
[4] http://www.w3.org/2001/sw/DataAccess/issues#cascadedQueries

-- Simon Raboczi
Received on Monday, 16 April 2007 17:20:58 GMT

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