Topology is the top-most element of any topology model.
拓扑是任何拓扑模型的最高层元素。
The source for the top-most element on the event route stack at which two logical trees diverge.
在事件路由堆叠中，新增开始分枝成两个逻辑树状结构的最上层项目。
It corresponds to the top-most element in the model and is parented by the viewer's root EditPart (see Figure 4).
它对应于模型中最顶部的元素，并且其父元素为查看器的根editpart(参见图4)。
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