节点类型以整数返回，并且允许您适当地处理每一个节点；一个元素(类型1)有名称没有值，但是一个文本节点(类型3)有值没有名称。

Node types are returned as integers, and allow you to handle each node appropriately; an element (type 1) has a name, but no value, whereas a text node (type 3) has a value but no name.

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所有名称、类型和值只用于说明。

All names, types, and values are for illustration purposes only.

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此外，带有名称空间前缀的元素的相关属性值的检索略有不同。

In addition, retrieval of the values of attributes associated with namespace-prefixed elements is slightly different.

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