It does this by defining XML constructs such as an id attribute and a ref attribute to serialize a graph structure into XML so that the recipient can create the same graph on the other end.

其方式为定义诸如id属性和ref属性之类的XML构造来将图结构序列化为XML，从而使接收方可以在另一端创建相同的图。

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Finally, there are some minor syntactical differences that need to be changed; for example, the ref element inside a property element has an id attribute instead of the bean attribute used in Spring.

最后，需要更改一些小的语法差异；例如，一个属性元素内的ref元素有一个id属性，而非spring中使用的bean属性。

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When you expand the XForms (input) section, you see that the ref USES an XPath expression to point to the id element in the data instance (see figure 8).

当展开XForms(输入)部分时，将看到ref使用XPath表达式指向数据实例中的id元素(参见图8)。

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