It has been said that computer science is the area where every problem can be solved by adding just one more level of indirection, so does this rule hold true here? The additional indirection gives us the ability to compensate for changes in the canonical model inside the messaging layer without having to touch application code. It also allows us to simplify the mapping logic inside the application by leaving tedious field mappings and datatype changes (e.g., a numeric ZIP_Code field to an alphanumeric Postal_Code field) to the mapping tools of messaging layer that are optimized for this kind
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