图4中的类图展示了用于封装后端调用的不同对象之间的关系。

The class diagram in Figure 4 shows the relationship among the different objects used to encapsulate the back-end call.

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然后就可以选择合适的XML API，让每个bean提供表示自己状态的元素，并递归地对自己的成员调用对象图。

You would then pick a suitable XML API and have each bean emit elements to represent its state and recursively call down the object graph to its members.

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图3展示了内容帮助调用文档对象。

Figure 3 shows content assist invoked on the document object.

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