HTTPRepository repository = new HTTPRepository(url, rid);
  QueryFactory query = new QueryFactory(repository);
  // select a language type
  query.setLanguage(QueryLangauge.SPARQL);

  // add a variable to the projection item list
  ProjectionItemFactory subject = query.addVariable("subject"); 
  // ask for all resources with explicit path
  Path p = query.addPath(subject, RDF.TYPE, "type"); 
  //make the path optional
  p.setOptional(true);

  // create a condition
  qf.addCondition("subject", ConditionFactory.INEQUALITY_OPERATOR_TYPE, RDF.TYPE);
  ConditionFactory cf = qf.addCondition("type", ConditionFactory.EQUALITY_OPERATOR_TYPE, RDF.SUBCLASSOF);
  // negate the condition
  cf.setNot(true);
  query.setLogicalConnector(SPARQLConstants.AND_LOGICAL_CONNECTOR);

  // build the query string, add namespace clause
  query.build(true);
  String str = query.getQueryString();  

  // execute the query (automatically builds the query string)
  // results[i] = result row, results[i][j] = column (variable)
  Value[][] results = query.execute();