protected function _buildCountQuery($uri, $setup)
{
$query = new Erfurt_Sparql_Query2();
$query->addProjectionVar(new Erfurt_Sparql_Query2_Var('resourceUri'));
$query->setCountStar(true);
$query->setDistinct();
$query->addElements(NavigationHelper::getInstancesTriples($uri, $setup));
// error logging
$this->_owApp->logger->info('NavigationController: COUNTQUERY: ' . $query->__toString());
//*/
return $query;
}