SimpleSAML_Utilities::isDOMElementOfType PHP Method

    public static function isDOMElementOfType(DOMNode $element, $name, $nsURI)
    {
        return SimpleSAML\Utils\XML::isDOMElementOfType($element, $name, $nsURI);
    }

 /**
  * Extract the response element from the SOAP response.
  *
  * @param string $soapResponse  The SOAP response.
  * @return string  The <saml1p:Response> element, as a string.
  */
 private static function extractResponse($soapResponse)
 {
     assert('is_string($soapResponse)');
     $doc = new DOMDocument();
     if (!$doc->loadXML($soapResponse)) {
         throw new SimpleSAML_Error_Exception('Error parsing SAML 1 artifact response.');
     }
     $soapEnvelope = $doc->firstChild;
     if (!SimpleSAML_Utilities::isDOMElementOfType($soapEnvelope, 'Envelope', 'http://schemas.xmlsoap.org/soap/envelope/')) {
         throw new SimpleSAML_Error_Exception('Expected artifact response to contain a <soap:Envelope> element.');
     }
     $soapBody = SimpleSAML_Utilities::getDOMChildren($soapEnvelope, 'Body', 'http://schemas.xmlsoap.org/soap/envelope/');
     if (count($soapBody) === 0) {
         throw new SimpleSAML_Error_Exception('Couldn\'t find <soap:Body> in <soap:Envelope>.');
     }
     $soapBody = $soapBody[0];
     $responseElement = SimpleSAML_Utilities::getDOMChildren($soapBody, 'Response', 'urn:oasis:names:tc:SAML:1.0:protocol');
     if (count($responseElement) === 0) {
         throw new SimpleSAML_Error_Exception('Couldn\'t find <saml1p:Response> in <soap:Body>.');
     }
     $responseElement = $responseElement[0];
     /*
      * Save the <saml1p:Response> element. Note that we need to import it
      * into a new document, in order to preserve namespace declarations.
      */
     $newDoc = new DOMDocument();
     $newDoc->appendChild($newDoc->importNode($responseElement, TRUE));
     $responseXML = $newDoc->saveXML();
     return $responseXML;
 }