public function loadWSDL()
    {
        $this->debug('instantiating wsdl class with doc: ' . $this->wsdlFile);
        $this->wsdl = new wsdl('', $this->proxyhost, $this->proxyport, $this->proxyusername, $this->proxypassword, $this->timeout, $this->response_timeout, $this->curl_options, $this->use_curl);
        $this->wsdl->setCredentials($this->username, $this->password, $this->authtype, $this->certRequest);
        $this->wsdl->fetchWSDL($this->wsdlFile);
        $this->checkWSDL();
    }