Defines a Web Service based outbound Messaging Gateway. A unique identifier for this Gateway. The channel where Messages should be sent to invoke the Web Service. The channel where Messages created from the Web Service responses will be sent. This is optional. However, if non-empty responses are expected and this is not set, then the request Messages must contain a REPLY_CHANNEL header. The Destination URI for this Web Service Gateway. If the URI should be determined at runtime (e.g. registry lookup), then configure a 'destination-provider' reference instead. Reference to a DestinationProvider implementation. Either provide this or a 'uri', never both. See org.springframework.ws.client.support.destination.DestinationProvider for more detail. Reference to a Spring OXM Mashaller. If the Marshaller instance also implements the Unmarshaller interface, then the 'unmarshaller' attribute is not required. Reference to a Spring OXM Unmarshaller. Reference to a Spring Web Services SourceExtractor. Reference to a Spring Web Services WebServiceMessageCallback. This enables changing the Web Service request message after the payload has been written to it but prior to invocation of the actual Web Service. Reference to the bean definition of a WebServiceMessageSender. Reference to the bean definition for a list or array of WebServiceMessageSenders. Reference to the bean definition of a ClientInterceptor. Reference to the bean definition for a list or array of ClientInterceptors. Defines a Web Service based inbound Messaging Gateway.