Managing environmental knowledge and the necessary IT tools - Environmental Deterioration and Contamination: Problems and their Management - page 441

Figure 12.6 Simplified logical data structure of the database.

Figure 12.7 Datasheet editor (2013).

On the left side of the data structure diagram there are the administrative data. These
are static information, and they are only changed if the system is redesigned or extended
by new pages and datasheets. There are n/m relations among the datasheets and the
pages, one datasheet consists of several pages and one page may belong to several
datasheets. The datasheet editor is shown in Figure 12.7. There are four possible
connection types between a datasheet and a page:

- Obligatory page, author must fill in one page;

- Optional page, author may fill in one page;