用于每个包含那个指令逻辑的样式表类型的类。
A class for each style sheet instruction type that contains the logic for that instruction.
所有的具体指令——所有的业务逻辑——实现命令接口。
All concrete commands — all business logic — realize the command interface.
如果操作数的大小未在指令中指定，这就意味着操作数的大小并不十分重要(例如逻辑指令)或者它的大小为32位。
If the size of the operand is not specified in the instruction, that means either that the size doesn't matter (as in logical instructions, for instance) or that it is using a 32-bit value size.
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