故提出层次代码编码体制，及其代码识别和控制函数。

Hierarchical code system, identifying code and control functions was presented.

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这个新增特性为用户提供了示例代码，可作为编码的基础。

This new feature provides sample code to the users, which can be used as a starting point for coding.

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如果该BLOB是以utf - 8之外的任何代码页编码的，那么用户可以指定输入BLOB的代码页作为CLEAN _ xml可选的第二个参数。

If the BLOB is encoded in another code page other than UTF-8, users can specify the code page of the BLOB input as an optional second parameter to CLEAN_XML.

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That goes back to that idea of sort of discipline coding. It's easy to have assumptions about what you think are going to come into the program when you writ it. If you really know what they are use them as search, but if you think there's going to be some flexibility, you want to prevent the user getting trapped in a bad spot, and exceptions as a consequence are a good thing to use.

这又回到了规范编码的想法上来了,在你写代码的时候考虑,什么会进入你的代码的思考是简单的,如果你真的知道,他们是用他们来做搜索的,而你希望有一定的灵活性，你想要阻止用户,陷入一个艰难的境地,那么异常是非常实用的。

麻省理工公开课 - 计算机科学及编程导论课程节选