Message is the vital link between the message publisher workstep and the message subscriber workstep. A message is a self-contained and self-explanatory package of business data which provides the necessary data and context information to its recipient to carry out its task independently. Typically, a message has two parts — header and payload.
The header contains name-value pairs of data pertaining to the sender and receiver of the message.
The payload of a message contains the actual business data, for example, purchase order data in XML format. Business Process Server supports only XML data for payload.
