Feedinfo is the main function, and takes a URL and an optional output stream (file-like object), defaulting to system output (the console).

feedinfo是主函数，负责接收url和可选的输出流(类似文件的对象)，默认输出流为系统输出(控制台)。

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XSIEQ(XML stream query with immediate evaluation), a kind of XML stream query system, can evaluate predicates immediately and output in time.

介绍了一种立即计算谓词并即时输出的XML流数据查询系统XSIEQ。

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