| The theoretical framework presented here develops at its fullest the structure of the system. It is the system that is at the basis of the implementation found in the unit books. In the unit books there is, however, some simplification, as is illustrated in the chart to the right, where the left sidebar of the A16 digital book is used as an example. In the unit book, we omit the explicit distinction of stratigraphy in the subcategories of Space and Time, while we add a number of links that refer to concrete situations in the unti itsdelf (e. g., loci and sections under volumetry). | 
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