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.
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.
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