[redland-dev] Some issues running redland-virtuoso-test

[lorena]

Hi

After installing Redland I wanted to check it's integration with Open
Source Virtuoso.

I've configured the ODBC connection and run utils/redland-virtuoso-test but
the last 3 tests failed.
After inspecting the source code I found that the problem was in the query
declaration

query=librdf_new_query(world, (char *)"vsparql", NULL, (const unsigned char
*)query_cmd, NULL);

By replacing these lines by the following I was able to successfully run
tests 19, 20, 21

query=librdf_new_query(world, "vsparql", NULL, (const unsigned char
*)query_cmd, NULL);

In particular I want to perform SPARQL GROUP BY queries over Virtuoso, so I
decided to modify the tests in order to run this query:

SELECT ?s (sum(?o) AS ?sumO)
WHERE {graph <http://red> { ?s ?p ?o }}
GROUP BY ?s

Consider a graph <http://red> that only contains the following triples
(otherwise the sum operator can not be applied since ?o may bind to some
non numeric values):

 rc |= add_triple_typed(world, context_node, model, "oo", "pp", "10^^<
http://www.w3.org/2001/XMLSchema#int>");
 rc |= add_triple_typed(world, context_node, model, "oo", "pp", "12^^<
http://www.w3.org/2001/XMLSchema#int>");
 rc |= add_triple_typed(world, context_node, model, "oo", "pp", "15^^<
http://www.w3.org/2001/XMLSchema#int>");

Surprisingly the query still raises an error, since VIrtuoso can not parse
this object values as integers.

My workaround was to re define the add_triple_typed function, and now I
actually pass type URLs as parameters, using *
librdf_new_node_from_typed_literal* instead of *
librdf_new_node_from_uri_string* to create the nodes.


I just wanted to know if this is ok or am I missing something?

Regards
Lorena








-- 
Lorena Etcheverry
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