Hi to all
I am trying to develop a SPARQL statement in a stored procedure related to
a virtual graph (result of a R2RML mapping) having its IRI not hard coded,
but contained in a variable.
I have tried for example the following syntax, but the query does not
return any triple.
declare graphName varchar;
graphName := 'http://example.com/resource';
for (sparql define input:storage "
http://www.openlinksw.com/schemas/virtrdf#DefaultQuadStorage";
select distinct ?class where
{
graph ?:graphName
{
?s <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> ?class
}
} order by ?class
) do
{
-- do something
string_to_file ('./dump/out.txt',"class" || '\n',-1);
} ;
As soon as I use the hard coded graph name in the SPARQL statement it works
fine.
...
select distinct ?class where
{
graph <http://example.com/resource>
{
?s <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> ?class
}
} order by ?class
) do
...
The same if I switch from a virtual graph to a real one. It works
immediately with te graph in a variable. Like in the following code.
declare graphName varchar;
graphName := 'http://xmlns.com/foaf/0.1/';
for (sparql define input:storage ""
select distinct ?class where
{
graph ?:graphName
{
?s <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> ?class
}
} order by ?class limit 10
) do
{
-- do something
string_to_file ('./dump/out.txt',"class" || '\n',-1);
} ;
Any chance to have a virtual graph IRI contained in a variable in a working
SPARQL statement?
Thanks!
Cheers
Beppe
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