EDI Message Structure

EDI messages consist of an envelope and a hierarchical series of structural elements. The envelope contains a set of headers and trailers, each set of which describes and contains a structural element. These structural elements are as follows:

      Transaction set/message
            Data Element
               Sub Element

EDI message structure is similar for both X12 and EDIFACT coding. Each EDI messages consists of the following (from the highest level to lower levels):

The hierarchical structure of an EDI message enables transaction sets/messages and groups to be batched. Even if an interchange contains only one transaction set/message and only one group, that interchange is structured with the same basic structural elements that it would have if it were batched, with the exception that there would not be multiple transaction set/message or group elements.

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