Views and packages provide an additional layer of security by shielding you from the internal details.

视图和包使您与内部细节分隔开，从而提供了一个附加的安全层。

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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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For instance, a common problem is to push XML parsing technologies used in the construction of views into the business layer.

例如，一个常见的问题就是将在构建视图时使用的XML解析技术直接应用到业务层。

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