Hello Peter,
> > CONSTRUCT {
> > <http://bio2rdf.org/interpro:IPR000181>
> > <http://bio2rdf.org/ns/bio2rdf#hasLinkCount>
> > `(select (count(?s)) as ?countS
> > where { ?s ?p <http://bio2rdf.org/interpro:IPR000181> })` }
> > where { ?s1 ?p1 ?o1 } limit 1
>
> Just to check I understand... The real query is inside the CONSTRUCT and the
> LIMIT 1 with ?s1 ?p1 ?o1 is just to ensure it returns results and is
> syntactically valid SPARQL?
Exactly. There will be always at least one triple in the Virtuoso
storage because system metadata graph is not empty, so this will form a
fake single-row result set.
Best Regards,
Ivan Mikhailov,
OpenLink Software
http://virtuoso.openlinksw.com
