con.addStatement(picasso, paints, guernica, context1);
con.commit();
ParsedTupleQuery tupleQuery = QueryParserUtil.parseTupleQuery(QueryLanguage.SERQL,
"select X from {X} rdf:type {Y} rdf:type {rdfs:Class}", null);
TupleExpr tupleExpr = tupleQuery.getTupleExpr();
MapBindingSet bindings = new MapBindingSet(1);
CloseableIteration<? extends BindingSet, QueryEvaluationException> iter;
iter = con.evaluate(tupleExpr, null, bindings, false);