The Message element provides a common abstraction for messages using XML schema elements and types. Each Message can contain many Message Part child items.
A Message can be added as a root level item. This can be done using the right click context menu.
Name - the name of the Message, used in the Operation elements Input, Output and Fault.
The WSDL code for a Message containing a Message Part:
<message name="NewOutputMessage">
<part name="OutputMessagePart" element="tns:OutputType" />
</message>