要有效地管理涉及持久性域模型的应用程序变化，必须协调数据、模式和模型的变化。
To manage any application change involving a persistent domain model effectively, you must coordinate changes in the data, schema, and model.
这就提供了最强大的功能，因为应用程序的前端将比内部的应用程序变化得更为经常。
This offered the most power, as it is expected that the front end of the application would change more often than the internal application.
在开发期间，即使应用程序没有变化，底层库也可能改变。
During development, even when an application does not change, the underlying libraries can change.
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