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