The FormatDescription Package contains classes which take the logical description of data and apply it to physical data. FormatDescription classes describe the physical layout of data, for example the details of how a CSV is represented.

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I added Physical Layout Order and Physical Layout Ordered Pairs to describe the order of Value Mappings in a Physical Layout.

There is a clear parallel now between Format and Logical Data Description: Structure Description, Physical Layout and Value Mapping map to Data Store, Logical Record Layout and Instance Variable, respectively. Orders in layouts are maintained independently though. It should be easier now to move between the physical and logical representations.

Package Graph