Term Definition: Message
Main Description

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 parameter types or classes of some domain model)