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An enterprise has two separate applications that are communicating via Messaging, using a Message Channel that connects them.

How can two applications connected by a message channel exchange a piece of information?

Package the information into a Message, a data record that the messaging system can transmit through a message channel.

Thus any data that is to be transmitted via a messaging system must be converted into one or more messages that can be sent through messaging channels.

Related patterns: Canonical Data Model, Command Message, Document Message, Event Message, Message Channel, Message Expiration, Message Sequence, Messaging, Request-Reply

Find the full description of this pattern in: Enterprise Integration Patterns Gregor Hohpe and Bobby Woolf ISBN 0321200683 650 pages Addison-Wesley

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