The above example showed how to create a blank physical data model, but what if you already have the database defined and you want to modify your design.
上面的示例演示了如何创建空白物理数据模型，但是如果已经定义了数据库，希望修改设计，那么应该怎么办？
An example of a transform would be from an analysis model to a design model and then perhaps from the design model to code.
转换的一个例子就是从分析模型转换为设计模型，可能还随后从设计模型转换为代码。
For example, in the Model-View-Controller (MVC) design pattern, the controller invokes methods.
例如，在模型-视图-控制器(MVC)设计模式中，控制器调用方法。
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