这是一种非常有用的工具，如果没有满足XPath条件，样式表作者可以通过该工具从转换中去掉某个完整的元素、模板或者整个样式表模块。
This is a very useful tool that allows the stylesheet writer to exclude completely certain elements, templates, or entire stylesheet modules from the transformation if an XPath condition is not met.
从本质上说，最终将得到一个处理words表的模型，一个让您查看单词统计的视图，以及一个执行某个逻辑的控制器。
What you will end up with in the end is, essentially, a Model to handle the words table, a View that lets you see the word counts, and a Controller to perform some logic.
当连接到我的服务器从我的笔记本电脑，看着在数据库中某个表。
When connecting to my server from my laptop and looking at a certain table in the DB.
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