分类法可以跨应用程序描述内容。
如图5所示，这些事件共同向应用程序描述了文档树。
As Figure 5 illustrates, taken together, the events describe the document tree to the application.
语法分析器读取这棵树，并通过事件为应用程序描述它。
The parser reads the tree and describes it, through events, to your application.
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