protected function renderDataTableMap(DataTable\Map $map, $prefix)
    {
        $output = "Set<hr />";
        $prefix = $prefix . '&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;';
        foreach ($map->getDataTables() as $descTable => $table) {
            $output .= $prefix . "<b>" . $descTable . "</b><br />";
            $output .= $prefix . $this->renderTable($table, $prefix . '&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;');
            $output .= "<hr />";
        }
        return $output;
    }