public function setDns01(string $dns_01) : CNabuDataObject
    {
        if ($dns_01 === null) {
            throw new ENabuCoreException(
                    ENabuCoreException::ERROR_NULL_VALUE_NOT_ALLOWED_IN,
                    array("\$dns_01")
            );
        }
        $this->setValue('nb_domain_zone_dns_01', $dns_01);
        
        return $this;
    }