Components are then combined or integrated into composite applications to provide services in the third layer.

然后，将组件结合或集成到复合应用程序中来提供第三层的服务。

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There are two ways to build a composite POJO at your service layer.

有两种方式在服务层构建组合POJO。

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Since composite applications may have different views of the data, there needs to be a way of providing data variability at the database schema layer.

由于组合应用程序可能具有不同的数据视图，因此需要能够在数据库模式层提供数据可变性。

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