该程序能够处理查询和绑定到XML文档。
The program is set up to handle queries and bind to your XML document.
如果其中没有“delete”查询参数，那么处理程序返回None。
If there is not a delete query argument, then it will return None.
中断处理程序经常负责更新一些在主程序中被查询的变量的值。
Interrupt service routines often set variables that are tested in main line code.
中断处理程序经常负责更新一些在主程序中被查询的变量的值。
Interrupt service routines often set variables that are tested in main line code.
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