从清单1的控件层次结构中可以清楚地看出这个结构。
This structure can best be seen by the control hierarchy shown in Listing 1.
该组件可以表示整个页面层次结构，并可从此控件中进行选择。
The entire page hierarchy is represented and can be selected from this control.
层次结构中的控件调用portlet的处理，而portlet也把它的内容写到该流。
A control in the hierarchy invokes the rendering of the portlet, which also writes its content to the stream.
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