Lourens,
I gues that this will work:
CREATE PROCEDURE VAS_PROPERTY_LABEL (in _uri varchar) {
for (sparql select ?v1_lab where { `iri(?:_uri)` skos:prefLabel
?v1_lab})
do {
RETURN "v1_lab";
}
RETURN _uri;
}
Colon in ?:_uri indicates an external variable, iri() converts a string
(that is a literal) into an IRI reference, backquotes around iri(...)
are syntax syntax so
{ `iri(?:_uri)` skos:prefLabel ?v1_lab}
is equivalent to
{ _:hidden_bnode skos:prefLabel ?v1_lab .
FILTER (_:hidden_bnode = iri(?:_uri)) }
Best Regards,
Ivan Mikhailov
OpenLink Software
http://virtuoso.openlinksw.com
On Sun, 2009-11-29 at 20:29 +0100, Lourens van der Meij wrote:
> Thanks for solving my previous problem. Next, I am looking at creating
> procedures.
> I somehow do not manage to use VPL variables in sparql queries:
> CREATE PROCEDURE VAS_PROPERTY_LABEL (in _uri varchar) {
> for (sparql select ?v1_lab where { _uri skos:prefLabel ?v1_lab})
> do {
> ^^^^^
> RETURN "v1_lab";
> }
> RETURN _uri;
> }
> Can I use VPL variables in sparql queries in procedures?
> (I know how to include "sql"-variables using $: but that does not seem
> to be working here)
>
> Are there examples specific to sparql VPL mixing available somewhere?
>
> Thanks,
>
> Lourens
>
>
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