⟩ What elements are contained in the WSDL document?
★ Types - Describe the variations of data types that are used to exchange messages between the user and the provider.
★ Message - Describes the actual message or method call.
★ PortType - Describes the set of operations and each related message.
★ Binding - Describes the protocol details.
★ Service - Used to make groups a set of related ports together.