public function getSeverityDescriptionString()
    {
        $returnValue = (string) '';

        switch ($this->severity) {
        	case common_Logger::TRACE_LEVEL:
        		$returnValue = "TRACE";break;
        	case common_Logger::DEBUG_LEVEL:
        		$returnValue = "DEBUG";break;
        	case common_Logger::INFO_LEVEL:
        		$returnValue = "INFO";break;
        	case common_Logger::WARNING_LEVEL:
        		$returnValue = "WARNING";break;
        	case common_Logger::ERROR_LEVEL:
        		$returnValue = "ERROR";break;
        	case common_Logger::FATAL_LEVEL:
        		$returnValue = "FATAL";break;
        	default:
        		$returnValue = "UNKNOWN";
        }

        return (string) $returnValue;
    }