为了编写可用于1.0、2.0以及将来版本的样式表，可以结合使用条件和use - when来避免静态错误，不管是用什么版本的处理程序。
To write a stylesheet that will work with 1.0, 2.0, and a future version, then you can combine conditional and use-when to avoid static errors no matter which version of processor you are using.
对于表3左侧列的DB 2示例，如果某条sql语句失败并生成一个错误，那么控制将被传递给条件处理程序。
In the case of the DB2 example in the left column of Table 3, if a particular SQL statement fails and generates an error, control is passed to the condition handler.
分析屏幕显示了每个条件在被上述表结果Tokenizer或TokenFilter处理后的结果。
The analysis screen displays the result of each term after it has been processed by the Tokenizer or TokenFilter named above the table results.
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