我们将首先从一个更新过的层次结构图开始，它表明了哪个类提供了对HTTP连接的支持。
We'll start with an updated hierarchy diagram that indicates which class provides support for HTTP connections.
DOM和zend类提供了更好的支持，即将所有名称空间的元素表示为可按层次遍历的节点或元素。
DOM and the Zend classes provide better support by presenting all elements of all namespaces as individual hierarchically-traversable nodes of other elements.
Python 3现支持能代表数值类的ABC的类型层次结构。
Python 3 now supports a type hierarchy of ABCs that represent numeric classes.
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