$query = Doctrine_Query::create()
			->from('Node n')
			->orderBy('n.sort ASC, n.name ASC');

			if(!empty($args['class'])) {
				$query->addWhere('n.class = ?', $class);
			}

			if(!empty($args['id'])) {
				if(is_array($args['id'])) {
					$query->addWhereIn('n.id', $args['id']);
				} else {
					$query->addWhere('n.id = ?', $args['id']);
				}
			}

			if(!empty($args['level']) || $args['level'] === 0) {
				$query->addWhere('n.level = ?', $args['level']);
			}

			$nodes = $query->fetchArray();