Introduction

There are three parallel ways of looking at the data:

1. the matrix is the raw setting in which data are first encountered;

2. once extricated from the matrix, the data can be aggregated according to criteria that are
   

   1. either intra-referential, i. e., based on criteria derived from the elements identified in the matrix,
   2. or extra-referential, i. e., based on data found outside the matrix;

3. a selection of the data can then be restructured, both physically through conservation and descriptively through presentation.

4. Finally, data can be re-appropriated as they are integrated and recognized as “heritage” by those who share the same territorial identity.

For a description of the website pages that implement these principles, especially in the unit books, see in the UGR website.