Scalr\Service\Aws\Client\SoapClient::_locateSignature PHP Метод

    protected function _locateSignature($objDoc)
    {
        if ($objDoc instanceof \DOMDocument) {
            $doc = $objDoc;
        } else {
            $doc = $objDoc->ownerDocument;
        }
        if ($doc) {
            $xpath = new \DOMXPath($doc);
            $xpath->registerNamespace('secdsig', self::XMLDSIGNS);
            $query = ".//secdsig:Signature";
            $nodeset = $xpath->query($query, $objDoc);
            $this->sigNode = $nodeset->item(0);
            return $this->sigNode;
        }
        return null;
    }