public function addSoapBinding(
        DOMElement $binding,
        $style = 'rpc',
        $transport = 'http://schemas.xmlsoap.org/soap/http'
    ) {
        $soapBinding = $this->dom->createElement('soap:binding');
        $soapBinding->setAttribute('style', $style);
        $soapBinding->setAttribute('transport', $transport);

        $binding->appendChild($soapBinding);

        return $soapBinding;
    }