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.

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。

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For example, if a certain element is always a leaf node in a particular document type (and has no XML attributes), you might want to refer to its PCDATA just by the node name itself.

比方说，如果特定文档中某个元素总是叶子节点(而且没有xml属性)，您可能希望通过节点名本身来引用其PC DATA。

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