Messages consist of one or more logical parts.
Each part is associated with a Type from some type system using a
message-typing attribute. The set of message-typing attributes is extensible.
WSDL defines several such message-typing attributes for use with XSD:
Use the context menu of a process object in Outline
view to add or delete a named message. Messages can be referenced by triggers, and input or output message of activities. Message contents can be changed through assignment.