
In fact there is no difference between links and categories. But linking chapters, authors and
publications directly together lead into a mess. The solution was to allow arbitrary links between
all elements of one publication with his decendents (chapters and data files). Direct links
between different publications are forbidden. In a second step the links can be connected to a
general categorie, in fact a more 'general' link.
The shown example is a 'category' link bundeling all information about an author.