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Re: ALL: Request for SPARQL b-node problem use case

From: Enrico Franconi <franconi@inf.unibz.it>
Date: Tue, 29 Nov 2005 09:44:06 +0100
Message-Id: <DA2E0B9D-B1E6-4761-8485-ACA827853F9F@inf.unibz.it>
Cc: <public-swbp-wg@w3.org>
To: "McBride, Brian" <brian.mcbride@hp.com>

On 29 Nov 2005, at 08:17, McBride, Brian wrote:

> David has highlighted a concern with SPARQL and we are asking all WG
> members if they can suggest a use case illustrating the issue.
> The issue concerns naming b-nodes.  Consider a query Q which cannot be
> directly expressed in SPARQL, but must be split into two stages.  The
> first stage Q' returns results which are processed by the querying
> application, possibly including human review, and the nodes  
> selected are
> the subject of further queries.  If the nodes in question are b-nodes
> there can be a problem because SPARQL does not provide a mechanism for
> naming the b-nodes in question.  It may be that the b-nodes can be
> identified by some of their property values.  The issue arises where
> this is not the case.

The issue of naming bnodes across queries is under investigation in  
the DAWG.

Enrico Franconi                  - franconi@inf.unibz.it
Free University of Bozen-Bolzano - http://www.inf.unibz.it/~franconi/
Faculty of Computer Science      - Phone: (+39) 0471-016-120
I-39100 Bozen-Bolzano BZ, Italy  - Fax:   (+39) 0471-016-129
Received on Tuesday, 29 November 2005 08:44:35 UTC

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