Each class will have all the methods that will fetch the information about a resource.

每个类都有将获取关于一个资源的信息的所有方法。

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Write callback methods to fetch the information from an XML document.

编写回调方法，从XML文档中提取信息。

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Write callback methods to fetch the information from an XML document.

编写回调方法，从XML文档中提取信息。

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