ExportOneCPackage::outputXmlDocument

protected function outputXmlDocument(DocumentBase $document, $level)
{
	$xml = $document->openNodeDirectory($level, $document::getLangByCodeField($document->getNameNodeDocument()));
	$xml .= $document->output($level+1);
	$xml .= $document->closeNodeDirectory($level, $document::getLangByCodeField($document->getNameNodeDocument()));
	return $xml;
}