下面介绍的 gestureListener.pl程序将打开从synclient 程序读取信息的管道，并且处理TouchPad事件以检测手势。
The gestureListener.pl program introduced below opens a pipe to read from the synclient program and processes the TouchPad events to detect gestures.
这些事件处理程序可以链接在一起，从而能够建立像UNIX命令行那样的管道。
Such event handlers can be chained together, so that you can build pipelines, just like the UNIX command line.
词法处理程序并不做很多事情：它只将事件转发给管道中的下一个过滤器，但XSLT处理器需要它们。
The lexical handler doesn't do much: It simply forwards the events to the next filter in the pipe, but the XSLT processor requires them.
“管道(pipe)”模式：单个事件触发一系列的处理步骤，每个步骤执行特定的功能。
The "pipe" pattern: a single event triggers a sequence of processing steps, each performing a specific function.
复杂事件处理(CEP)既为事件提供管道也为事件提供源头。
Complex event processing (CEP) providing both conduits for and sources of events.
复杂事件处理(CEP)既为事件提供管道也为事件提供源头。
Complex event processing (CEP) providing both conduits for and sources of events.
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