Dyn indicates whether the application environment is dynamic or static.
Dyn指示该应用程序环境是动态还是静态的。
One interesting possibility might be to pass in an XPath to be used to test whether a template should be traced, and call the EXSLT Dynamic XPath Evaluation extension (dyn: evaluate ) to execute it.
一种令人感兴趣的可能性是传递XPath，我们要用这个XPath来测试是否应该跟踪模板，并调用EXSLT Dynamic XPath Evaluation扩展(dyn： evaluate)来执行它。
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