The xmllib works by the application programmer overriding the class XMLParser, and providing methods to handle document elements such as specific or generic tags, or character entities.

应用程序员使用的xmllib可以覆盖xmlparser类，并提供处理文档元素(如特定或类属标记，或字符实体)的方法。

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With mixins formulated as generic classes, we always have a handle on the parent class, the type parameter that the class extends.

将 mixin 明确表述为泛型类，我们就始终有父类的句柄，它是该类继承的类型参数。

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