Suppose, for instance, that a Python programmer wants to write a script that automatically sends a message to her cell phone when the bus she takes to work rounds a particular corner.
假设，比方说，某个Pyhon程序员想要写一个脚本，可以当她乘坐的公共汽车正好转过某个弯时，程序自动发送消息到她的手机里。
The xsl:message element does not change the result tree produced by the XSLT stylesheet at all. It merely outputs a message somewhere the programmer can see it.
message 元素不改变 XSLT 样式表生成的结果树，仅仅输出一些消息让程序员看到。
While this is a step in the right direction, it's still a pretty useless message in terms of telling the user or a programmer working on the application what actually went wrong.
尽管这是朝正确方向前进的一步，但是要告诉从事应用程序开发的用户和程序员究竟发生了什么问题，这些消息仍然是没有太大用处的。
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