public static function createCompleteMultipartUploadXmlBody($listParts)
    {
        $xml = new \SimpleXMLElement('<?xml version="1.0" encoding="utf-8"?><CompleteMultipartUpload></CompleteMultipartUpload>');
        foreach ($listParts as $node) {
            $part = $xml->addChild('Part');
            $part->addChild('PartNumber', $node['PartNumber']);
            $part->addChild('ETag', $node['ETag']);
        }
        return $xml->asXML();
    }