Suppose you have the dimensions of a set of five rooms in a building whose names are "room1", "room2", ... "room5".
For each room you have measured the length, the breadth and the height.
Suppose you want to be able to answer a variety of questions, for instance
o questions about individual named rooms, e.g. questions about the perimeter, the total floor area, or total volume.
o questions about all the rooms
o questions about all the rooms that satisfy a certain condition (e.g. area greater than some given number).
Those are fairly easy problems to solve in many programming languages. We'll show how to do them simply as a way of introducing the concepts and techniques of Pop-11.