private static function convertNode(XMLElement $element, DOMNode $node)
    {
        if ($node->hasAttributes()) {
            foreach ($node->attributes as $name => $attrEl) {
                $element->setAttribute($name, General::sanitize($attrEl->value));
            }
        }

        if ($node->hasChildNodes()) {
            foreach ($node->childNodes as $childNode) {
                if ($childNode instanceof DOMCdataSection) {
                    $element->setValue(General::wrapInCDATA($childNode->data));
                } elseif ($childNode instanceof DOMText) {
                    if ($childNode->isWhitespaceInElementContent() === false) {
                        $element->setValue(General::sanitize($childNode->data));
                    }
                } elseif ($childNode instanceof DOMElement) {
                    self::convert($element, $childNode);
                }
            }
        }
    }