[namedgraphs] [SWClLib] problem running a simple example

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Hi,

I'm trying to run the Java example given in section 5.2 of the 
documentation page 
http://www4.wiwiss.fu-berlin.de/bizer/ng4j/semwebclient/#using

---------------------------------------------------
SemanticWebClient semweb = new SemanticWebClient();
//Logger.getLogger("de.fuberlin.wiwiss.ng4j.semwebclient").setLevel(Level.TRACE);

String queryString =
   "PREFIX foaf: <http://xmlns.com/foaf/0.1/> " +
   "SELECT DISTINCT ?i WHERE {" +
      "<http://www.w3.org/People/Berners-Lee/card#i> foaf:knows ?p . " +
      "?p foaf:interest ?i ." +
   "}";

Query query = QueryFactory.create(queryString);
QueryExecution qe = QueryExecutionFactory.create(
   query,semweb.asJenaModel("default"));
ResultSet results = qe.execSelect();

ResultSetFormatter.out(System.out, results, query);

//semweb.close();
--------------------------------------------------

The program terminated but returns :
-----
| i |
=====
-----

In fact, the simpler query :

-------------------------------------------------------------------
"PREFIX foaf: <http://xmlns.com/foaf/0.1/> " +
"SELECT DISTINCT ?p WHERE {" +
"<http://www.w3.org/People/Berners-Lee/card#i> foaf:knows ?p . " +
"}"
-------------------------------------------------------------------

doesnt return any triple neither.
While tracing the execution with the logger I saw this :

-----------------------------------------------------------------
Queue result graph: <http://www.w3.org/People/Berners-Lee/card> (76 triples)
-----------------------------------------------------------------

so I dont understand why there is no match against the triple set 
retreived from <http://www.w3.org/People/Berners-Lee/card> ...

whats wrong ?

(I'm using ng4j-0.9.3 and jena-2.6.2)

Greetings,
-- 
Frédéric Raimbault