A container which identifies a subset of an
information model or domain model which is passed into or out of a service invocation. A message is always passed by
value and has no defined behavior.
A message represents the concept as defined in the WSDL
specification, that is, a container for actual data which has meaning to the service and the consumer. A message
has no operations, it can have properties and associations to other classes (one assumes either classes of some domain model or parameter types)
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