public static function findLinguisticDataInIndex($id)
 {
     $logger = Logger::getLogger("LinguisticObjects.findLinguisticDataInIndex");
     $attr_values = null;
     $indexer = new Indexer();
     $index_file = $indexer->get_main_index_pathname();
     $fh = fopen($index_file, 'r');
     while (($ligne = fgets($fh)) != null) {
         list($an_id, $position, $csv_file_name) = explode(':', trim($ligne));
         if ($an_id == $id) {
             $file_name = $indexer->get_data_pathname($csv_file_name);
             $logger->debug("\$file_name= {$file_name}; \$position= {$position}");
             $fih = fopen($file_name, 'r');
             fseek($fih, $position);
             $data = fgets($fih);
             $logger->debug("\$data= {$data}");
             fseek($fih, 0);
             $fields_desc = fgets($fih);
             $logger->debug("\$fields= {$fields_desc}");
             fclose($fih);
             $fieldsValues = parseCSV($fields_desc, $data);
             $attr_values = $fieldsValues;
             break;
         }
     }
     fclose($fh);
     return $attr_values;
 }