拓扑是任何拓扑模型的最高层元素。

Topology is the top-most element of any topology model.

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将重复控件绑定到响应文档中的最高层元素，如图8所示。

Bind the repeat control to the highest element in the response document as shown in figure 8.

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只有在相关模式的最高层定义的元素才可以充当数据实例中的根元素。

Only elements defined at the highest level in the associated schema can serve as root elements in a data instance.

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