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It's the simplest possible organization: the data are collected in the file in the order in which they arrive, and it's not even required that the records have a common format across the file (different fields/sizes, same fields in different orders, etc.are possible). This implies that each record/field must be self-describing. Despite the obvious storage efficiency and the easy update, it's quite clear that this ``structure'' is not suited for easy data retireval, since retrieving a datum basically requires detailed analysis of the file content. It makes sense only as temporary storage for data to be later structured in some way.

Franco Callari