指定一个约束规则，确定属性之间的次序和选项。

Specify a constraining rule that determines the order and choice between attributes.

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在映射规则中，为功能性映射指定输入值的次序并不影响调用映射的次数，但是会影响输出对象出现的次序。

In map Rules, the order in which the input values for a functional map are specified does not affect how many times the map is called, but it does affect the order in which the output objects appear.

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管理所需的词汇次序的语法规则。

Syntactic rules covering a required term order.

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