public function addBindingOperation($binding, $name, $input = false, $output = false, $fault = false)
    {
        $operation = $this->_dom->createElement('operation');
        $operation->setAttribute('name', $name);

        if (is_array($input)) {
            $node = $this->_dom->createElement('input');
            $soap_node = $this->_dom->createElement('soap:body');
            foreach ($input as $name => $value) {
                $soap_node->setAttribute($name, $value);
            }
            $node->appendChild($soap_node);
            $operation->appendChild($node);
        }

        if (is_array($output)) {
            $node = $this->_dom->createElement('output');
            $soap_node = $this->_dom->createElement('soap:body');
            foreach ($output as $name => $value) {
                $soap_node->setAttribute($name, $value);
            }
            $node->appendChild($soap_node);
            $operation->appendChild($node);
        }

        if (is_array($fault)) {
            $node = $this->_dom->createElement('fault');
            if (isset($fault['name'])) {
                $node->setAttribute('name', $fault['name']);
            }
            $soap_node = $this->_dom->createElement('soap:body');
            foreach ($output as $name => $value) {
                $soap_node->setAttribute($name, $value);
            }
            $node->appendChild($soap_node);
            $operation->appendChild($node);
        }

        $binding->appendChild($operation);

        return $operation;
    }