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Several applications are communicating via Messages that follow an agreed upon data format, perhaps an enterprise-wide Canonical Data Model. However, that format may need to change over time.
How can a message’s data format be designed to allow for possible future changes?
Design a data format that includes a Format Indicator, so that the message specifies what format it is using.
The format indicator enables the sender to tell the receiver the format of the message. This way, a receiver expecting several possible formats knows which one a message is using and therefore how to interpret the message’s contents....
Related patterns: Canonical Data Model, Message
Gregor Hohpe and Bobby Woolf
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