对于与复合状态兼容的每一种元数据类型，子状态机中的每一个转换都有一个限制策略。

For each metadata type compatible with a composite state, every transition in the sub-state machine has a policy for restriction.

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section是一种特殊类型的可展开复合程序，用于添加标题下面的可选描述。

A section is a special type of expandable composite that adds optional description below the title.

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复合类型是另一种原因的例外。

Complex types are an exception for a different reason.

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