因为返回的SOAPElement在底层具有对象层次结构，所以必须递归地处理树以获得实际的数据对象。

Since the returned SOAPElement has a hierarchy of objects underneath, you have to iterate through the tree to get the actual data object.

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可以使用到这种层次结构，也可以使用递归嵌套的元素。

You can use either the through hierarchy or the element, nested recursively.

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由于其复杂的结构，你可以对活动递归地进行分组并对流进行连接以形成更高的层，这种层次清晰地定义了输入和输出。

As with complex structures, you can recursively group activities and their interconnection flows into higher-level activities with clearly defined inputs and outputs.

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