] >
Note. The program assumes the following library of commands, and a screen having a coordinate system whose origin is at the upper-left corner.
| rect id(x, y, width, height); | Rectangular box of dimensions ‘(width, height)’ at location ‘(x, y)’. |
| text id(x, y, "..."); | Textual element of content ‘ "..." ’ at location ‘(x,y)’ |
| figure* id = { &id_1, &id_2, ... }; | Grouping mechanism for rectangular boxes and textual elements. |