RETURN：表示从查询到用户的数据返回。
Return: Represents the return of data from the query to the user.
细心的读者可能察觉到，一个联邦搜索返回的XML数据可能以多种多样的、不可预测的xml词汇的形式出现。
Observant readers might suspect that the XML data returned from a federated search will be in various unpredictable XML vocabularies.
每个函数的末尾调用 printData 函数，根据 $print 类变量的值返回 XHTML 数据，或显示到浏览器。
The end of each function calls the printData function, and based on the value of the $print class variable the XHTML data will either be returned from the function or displayed to the browser.
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