简而言之，通过扩展我们可以从 XSL 文档中调用使用其它编程语言编写的方法。

Simply put, extensions are a way of calling a method written in some other programming language from within an XSL document.

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通过抽取突出显示逻辑，可以编写调用highlightutil类的方法的单元测试。

By extracting the highlighting logic, you can write unit tests for it by calling methods on the HighlightUtil class.

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编写检测器可以查找对特定静态方法的调用，这并不困难，但是大多数的bug检测器都包含相当多的分析和实现。

Writing a detector to find calls to a particular static method isn't that hard, but most bug detectors involve a fair bit more analysis and implementation effort.

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