public function getUtf8Value()
    {
        if (strcasecmp($this->encoding, 'utf8') == 0  
            || strcasecmp($this->encoding, 'utf-8') == 0 
        ) {
                return $this->value;
        } else {

            return (PHP_OS != 'AIX') ? iconv($this->encoding, 'UTF-8', $this->value) : iconv('ISO8859-1', 'UTF-8', $this->value);
        }
    }