private function __convertValue($sValue)
    {
        $cType = substr($sValue, 0, 1);
        $sValue = substr($sValue, 1);
        switch ($cType)
        {
            case 'S':
                $value = ($sValue === false ? '' : $sValue);
                break;
            case 'B':
                $value = $this->__convertStringToBool($sValue);
                break;
            case 'N':
                $value = ($sValue == floor($sValue) ? (int)$sValue : (float)$sValue);
                break;
            case '*':
            default:
                $value = null;
                break;
        }
        return $value;
    }