If the alternate attribute is set to shifted (s), then these variable characters are of only minor importance.
如果替代属性设置为移位(S)，那么这些可变字符就是次要的。
The name of each local variable corresponds to the name attribute of the respective input field in the form.
每个局部变量的名称都对应着表单中相应输入域的name属性。
The alternate attribute controls the handling of variable characters in the UCA: white space, punctuation marks, and symbols.
替代属性控制对uca中的可变字符的处理：空白、标点和符号。
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