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The EntityBase is found in a layer called the Domain Model. In Figure 2, you see an overview of the different layers in the new architecture.

Figure 2Figure 2 Overview of new architecture.

As shown in the figure, one way to use the Domain Model is to let the client work directly with it. But there is nothing stopping you from letting the client work only with Data Transfer Objects instead. (See Fowler, Patterns of Enterprise Application Architecture.) What I mean is that this discussion is important, no matter what you let the client interact with.

As you get a feeling for Figure 2, this time there is a lot more code that will cooperate to provide the result (actually, too much for those simple tests, but beneficial for real applications). What is the extra code? Stay tuned.

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