如果使用字符映射，则首先考虑是否对映射字符进行规范化，还是对映射后的字符规范化。

If character mapping is used, then first consider whether you want to apply normalization to the character being mapped, or apply normalization after the character is mapped.

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保留字符内容中的所有空白(不包括换行规范化过程中删除的字符)。

All whitespace in character content is retained (excluding characters removed during line feed normalization).

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行01到05对输入进行规范化，把输入变成大写字母，去掉其他字符。

Lines 01 to 05 normalize the input to capital letters and drop all other characters.

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