Hello Mikael,
Virtuoso can query unspecified graphs so the issue is probably misused
interface. Can you reproduce this problem by querying via ISQL? If yes
then that is a real (and surprising) problem. If you're using /sparql/
or /isparql/ web service endpoint then please check whether 'default
graph' field contains graph name or empty. When empty then by triple
patterns outside graph ... { ... } will be matched against at all
graphs, when non-empty then they will be restricted to the specified
graph. So if graph is specified but empty then you get nuthing without
graph ?g { ... } and get everything with it.
Best Regards,
Ivan Mikhailov,
OpenLink Software.
On Sun, 2008-01-27 at 11:04 +0100, Mikael Högqvist wrote:
> Hi,
>
> I'm using virtuoso 5.0.3 and have run into a problem with queries. I
> expect that a query like
>
> select ?s ?p ?o where { ?s ?p ?o }
>
> would return all triples in the store. But it returns nothing, while this
> query:
>
> select ?s ?p ?o where { graph ?g {?s ?p ?o }}
>
> returns all the triples. I did not run into this with earlier versions
> of virtuoso and could not find any related configuration setting. All
> graphs are indexed by uploading via WebDAV to an rdf_sink-directory.
>
> Is it possible to avoid "graph ?g { ... }"?.
>
> Thanks,
> Mikael
