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Message construction involves the architectural patterns of various constructs, functions, and activities involved in creating and transforming a message between applications. This chapter introduces message construction patterns and how each of them can be simulated using WSO2 ESB.

Command Message

How messaging can be used to invoke a procedure in another application.

Document Message

How messaging can be used to transfer data between applications.

How messaging can be used to transmit events from one application to another.

Request-Reply

How an application that sends a message gets a response from the receiver.

How a replier knows where to send the reply.

How a requester that has received a reply knows which request the reply is for.

How messaging can transmit an arbitrarily large amount of data.

Message Expiration

How a sender indicates when a message should be considered stale and therefore should not be processed.


Format Indicator How a message’s data format can be designed to allow for possible future changes.
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