Register callback implementations (by using a class that extends DefaultHandler, for example).

注册回调实现(例如，通过使用继承defaulthandler的类)。

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Default implementations provided by DefaultHandler are retained for other event processing methods.

对于其它事件处理方法，由保留defaulthandler提供缺省实现。

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The easiest solution to declare an event handler is to inherit from the SAX-provided defaulthandler.

声明事件处理器的最简单方案是继承SAX提供的defaulthandler。

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