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Re: UNION example

From: Eric Prud'hommeaux <eric@w3.org>
Date: Thu, 1 Jun 2006 13:59:30 +0200
To: Richard Newman <r.newman@reading.ac.uk>
Cc: public-rdf-dawg-comments@w3.org
Message-ID: <20060601115930.GC9291@unagi.w3.org>

On Mon, May 08, 2006 at 07:15:22PM -0700, Richard Newman wrote:
> 
> Hi all,
>   I was just working my way through the SPARQL CR, and noticed a  
> slight annoyance in <http://www.w3.org/TR/rdf-sparql-query/#unionOp>.
> 
>   The example data only specifies titles:
> 
> ===================================================
> @prefix dc10:  <http://purl.org/dc/elements/1.0/> .
> @prefix dc11:  <http://purl.org/dc/elements/1.1/> .
> 
> _:a  dc10:title     "SPARQL Query Language Tutorial" .
> 
> _:b  dc11:title     "SPARQL Protocol Tutorial" .
> 
> _:c  dc10:title     "SPARQL" .
> _:c  dc11:title     "SPARQL (updated)" .
> ===================================================
> 
>   but the second query references creators:
> 
> 
> ===================================================
> PREFIX dc10:  <http://purl.org/dc/elements/1.1/>
> PREFIX dc11:  <http://purl.org/dc/elements/1.0/>
> 
> SELECT ?title ?author
> WHERE  { { ?book dc10:title ?title .  ?book dc10:creator ?author }
>          UNION
>          { ?book dc11:title ?title .  ?book dc11:creator ?author }
>        }
> ===================================================
> 
>   Running this query against the data in the document will not  
> produce the stated results:
> 
> author         |  title
> ====================================================
> "Alice"        |  "SPARQL Protocol Tutorial"
> ----------------------------------------------------
> "Bob"          |  "SPARQL Query Language Tutorial"
> ====================================================
> 
> 
>   I suggest adding the triples
> 
> _:b  dc11:creator  "Alice" .
> _:a  dc10:creator  "Bob" .
> 
>   to the example data, if only for clarity's sake.
> 
> -R

Andy fixed that in the editor's draft 1.677 (see
  http://www.w3.org/2001/sw/DataAccess/rq23/#unionOp
  http://www.w3.org/2001/sw/DataAccess/rq23/#chlog
and
  http://www.w3.org/2001/sw/DataAccess/rq23/examples )

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--
-eric

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Received on Thursday, 1 June 2006 11:57:55 GMT

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