Re: [namedgraphs] [SWClLib] problem running a simple example

[Olaf H. <ha...@in...>]

Hello Frédéric,

You may try to increase the number of maximal depth of link following a bit. 
To do this you just have to add the following line after the creation of the 
semweb object:

 semweb.getConfig().setValue( SemanticWebClientConfig.MAXSTEPS, "5" );

Please report whether that helped.

Greetings,
Olaf


On Monday 10 January 2011 20:42:42 Frederic Raimbault wrote:
> 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.T
> RACE);
> 
> 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,