Electronic data Interchange for Administration, Commerce and Transport (EDIFACT) defines which data segments are mandatory or optional, and the number and order of elements.
定义了数据的哪些节是必须的或者是可选的，数据节的数量和数据元素的顺序。
Electronic data Interchange for Administration, Commerce and Transport (EDIFACT) defines which data segments are mandatory or optional, and the number and order of elements.
定义了数据的哪些节是必须的或者是可选的，数据节的数量和数据元素的顺序。
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