The Augmented-Catalog Data
The data contained in the augmented catalog are basically alphanumeric. 3 Of particular consequence to both the display console design and the entire computer- based library is the large number of alphanumeric sym- bols that is required. The set of 128 USASCII standard symbols is insufficient, and thus must be augmented. Furthermore, provisions for superscripts, subscripts and underlines must be included to properly display to users in forms with which they are familiar such items as chemical formulas and mathematical equations.
Relationships among key words and phrases in the catalog as shown in a thesaurus are perhaps most easily displayed as a tree. Thus, as an aid to the user, the display console should have the graphical capability to display a simple tree structure amongst words and phrases.