在燃气加热安装系统的自激控制电路中，整个标准开关适用于毫伏电压。

Standard switch entirely suitable for millivolt service on self-energized control circuits of gas fired heating installations.

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但同时也是一个处理程序，在承担解析器角色的同时，也能通过开关帽子处理任何标准SAX事件，并把事件传递给下一个处理程序。

But it's also a handler, one that can deal with any standard SAX event simply by switching hats, taking on its parser role, and passing the event on to the next handler.

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如果没有提供任何检索开关，则进入交互模式，在这里用户可以交互式地提供检索标准。

If no searching switches are provided, I enter the interactive mode where the user can provide search criteria interactively.

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