This represents the one XML element (from Listing 1) and is the basic structure for the class hierarchy.

它表示一个XML元素(来自清单1)，是类层次的基本结构。

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Discover the hierarchical tree structure classes by finding the class in the Model Explorer, double-click to open the class in the editor, and press F4 to open the hierarchy tree.

通过寻找模型搜索器中的类，找出等级树状结构类，双击打开编辑器中的类，按下f 4以打开等级树。

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From then on, the ancient Chinese social class structure began to change from hierarchy standard to wealth standard.

由此，中国古代社会的阶层结构出现转型，由身份等级制向以财富为标准的贫富转化。

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