WSDL
The description of the XML service.
This is an XML file that describes the web service. Usually, you can use some type of XML software to generate the WSDL. But we'll take a quick look at it just so we know what it is doing.
- <wsdl:types> describes non built in data types, such as Lists. This is only required if such data types exist.
- <wsdl:message> A request is one message, and a response is another. The arguments of a method call are each parts of this message, and the return is one part of the result method, or empty if the method returns void.
- <wsdl:portType> This relates to a class or interface in Java, which may contain multiple messages. These messages must be defined previously in the WSDL document.
- <wsdl:binding> This corresponds to a port type using a specific protocol, such as GET or POST. There must be one binding for each protocol supported.
- <wsdl:service> A service is a collection of ports. A port represents the availability of a binding at a specified endpoint.