public function writeXml(\XMLWriter $xmlWriter)
    {
        $content = null;
        if (!is_null($this->_subscriptionDescription)) {
            $content = new Content();
            $content->setText(
                XmlSerializer::objectSerialize(
                    $this->_subscriptionDescription,
                    'SubscriptionDescription'
                )
            );
        }
        $this->_entry->setContent($content);
        $this->_entry->writeXml($xmlWriter);
    }