function toRaw()
    {
        list($fields, $directory, $record_length, $base_address) = $this->_buildDirectory();
        $this->setLeaderLengths($record_length, $base_address);

        /**
         * Glue together all parts
         */
        return $this->getLeader().implode("", $directory).File_MARC::END_OF_FIELD.implode("", $fields).File_MARC::END_OF_RECORD;
    }