XML标记的不同部分(如起始和结束标签、文本、实体)触发特殊的事件，开发人员为这些事件注册处理程序代码。
The developer registers handler code for specific events that are triggered by different parts of XML markup (such as start and end tags, text, entities).
XML 标记的不同部分（如起始和结束标记、文本、实体）触发特殊的事件，然后为这些事件注册处理程序代码。
You register handler code for specific events that are triggered by different parts of XML markup (such as start and end tags, text, and entities).
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