每一代码为256个单独字母数字或指令字符之一。

Each code represents one of 256 discrete alphanumeric or command characters.

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编译器指令的语法是“$”后紧跟一个指令字符，再跟一个“-”或“+”。

The syntax of a switch directive option is $ followed by the directive letter, followed by a plus (+) or a minus (-).

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这三个字符形成了JSP指令语法的开始序列。

Those three characters form the opening sequence of JSP directive syntax.

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