Represents an interaction pattern for a specific message exchange. When sending a message the sender application can specify where errors are to be returned, where responses are to go, along with other interaction information. A call represents an exchange pattern for this message. It is built up as the message flows through the ESB and identifies where the message should go, along with any routing information for faults, replies etc. To: the destination. MANDATORY. From: the sender. OPTIONAL. If not defined, then the sender MAY be inferred from the transport. ReplyTo: the destination for any response. OPTIONAL. FaultTo: the destination for any error message. OPTIONAL. RelatesTo: used to indicate that this message is related to another. OPTIONAL. Action: used by the sender to indicate the semantics of the message. Must be unique. MANDATORY. MessageID: used to uniquely identify this message. OPTIONAL.
@author marklittle
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