许多持久性机制以关系的方法而不是面向对象方法存储数据。
Many persistence mechanisms store data in a relational way rather than an object-oriented way.
即使对于不使用面向方面方法的开发人员，从多维的角度看待元数据对设计注释类型也会提供概念上的帮助。
Even for developers who do not take an aspect-oriented approach, the multidimensional view of metadata is a valuable conceptual aid in designing annotation types.
作为一个面向对象系统，类是以数据和对数据进行操作的方法的集合。
In an object-oriented system, a class is a collection of data and methods that operate on that data.
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