Chapter 6 Generating from a Conceptual Data Model
You can generate a CDM into a CDM when you need to keep two models synchronized during the design process.
This kind of generation allows you to create a copy of a given model and define generation links between objects in the source CDM and their equivalent in the generated CDM. When changes are made to the source model, they can then be easily propagated to the generated models using the Update Existing Model generation mode.
The generated model is the one that usually contains more information.
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