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On 18/02/11 14:13, Emanuele Della Valle wrote:
> Hi all,
> 

> Simple enough, but what if I want to put ?n in a RDF graph? I've tried
> several variants of the following query but none appears to be
> grammatically valid
> 
> PREFIX books:   <http://example.org/book/>
> PREFIX dc:      <http://purl.org/dc/elements/1.1/>
> CONSTRUCT { ?o <http://ex.org/n> (count(?o) as ?n) }
> WHERE
>   { ?s dc:creator ?o }
> GROUP BY ?o
> 
> Can you help me?
> 
> Is this something that SPARQL 1.1 will enable?

It does indeed:

PREFIX books:   <http://example.org/book/>
PREFIX dc:      <http://purl.org/dc/elements/1.1/>
CONSTRUCT { ?o <http://ex.org/n> ?n }
WHERE
{
  SELECT (count(?o) as ?n)
  { ?s dc:creator ?o }
  GROUP BY ?o
}

Damian
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