bindings.addBinding("Z", painting);
iter = con.evaluate(tupleQuery, bindings, false);
resultCount = verifyQueryResult(iter, 1);
assertEquals("Wrong number of query results", 1, resultCount);
bindings.removeBinding("Y");
iter = con.evaluate(tupleQuery, bindings, false);
resultCount = verifyQueryResult(iter, 1);
assertEquals("Wrong number of query results", 2, resultCount);
}