See also this closed bug report:
http://sourceforge.net/tracker/?func=detail&aid=2995846&group_id=161622&atid=820574
On 03/02/2011 02:42 PM, Rob Vesse wrote:
>
> Hi all
>
> I've found what appears to be a major bug with Virtuoso's SPARQL results
> for one specific query namely:
>
> SELECT DISTINCT ?g WHERE { GRAPH ?g { ?s ?p ?o } }
>
> When this query is executed results come back as <literal> elements in
> the XML results rather than as <uri> elements. If you remove the
> DISTINCT modifier then they come back as <uri> fine.
>
> I assume that this is a bug in your optimisation of the above query
> since the above is commonly optimised specially since it is often used
> to list the graphs of a SPARQL endpoint.
>
> Regards,
>
> Rob Vesse
>
>
>
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