public function sendSoapRequest($action, $body = "")
    {
        $soap_schema_url = $this->config['schema_url'];
        $xml = $this->xmlRequest;
        $call = $xml->createElement('ns:' . $action);
        if ($body) {
            $bodyXml = SoapUtils::toXml($body);
            if ($bodyXml->hasChildNodes()) {
                foreach ($bodyXml->childNodes as $bodyChildNode) {
                    $bodyNode = $xml->importNode($bodyChildNode, true);
                    $call->appendChild($bodyNode);
                }
            }
        }

        $xmlBody = $xml->getElementsByTagNameNS($soap_schema_url, 'Body')->item(0);

        // cleanup if body already set
        foreach ($xmlBody->childNodes as $node) {
            $xmlBody->removeChild($node);
        }

        $xmlBody->appendChild($call);
        $this->debugSection("Request", $req = $xml->C14N());

        if ($this->isFunctional && $this->config['framework_collect_buffer']) {
            $response = $this->processInternalRequest($action, $req);
        } else {
            $response = $this->processExternalRequest($action, $req);
        }

        $this->debugSection("Response", (string) $response);
        $this->xmlResponse = SoapUtils::toXml($response);
        $this->xmlStructure = null;
    }