function testParseNested()
 {
     //echo "<b>Nested queries tests</b><br/>\n";
     foreach ($GLOBALS['testSparqlParserTestsNested'] as $arNestedTest) {
         list($query, $strExpected) = $arNestedTest;
         $p = new SparqlParser();
         $q = $p->parse($query);
         $qs = new SparqlEngineDb_QuerySimplifier();
         $qs->simplify($q);
         $strRendResult = SparqlTestHelper::renderResult($q);
         $this->assertEqual($strExpected, $strRendResult);
     }
 }