在运行时刻，AT通过调用平台易访问性框架来获取有关用户界面要素的信息，框架依次调用。swt . accessibility包。

At runtime, the at obtains information about the user interface elements by calling the platform accessibility framework, which in turn calls into the.swt.accessibility package.

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在这个例子中所使用的约定是，使用一个和合成要素名称一致的类图表，并且在包含该合成要素的包中，显示它的外部视图。

The convention used in this example is to use a class diagram with a name that is the same as the component, and, in the package containing the component, to show its external view.

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其中基础类包是应用类包和组合类包的基础，它用点、线、面、体、复杂对象和关系类等基本的要素表示三维空间。

The base package including point class, line class, area class, volume class, complex object class and relation class, is the base of the application package and the combination package.

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