Variables are CAD objects like the others. They are saved as objects of a
construction. They are part of the construction.
Variables are divided into:
The number variable is the wildcard for a numerical value and can be
used whenever a number is expected.
A text variable is the wildcard for a string and will be used for texts.
A co-ordinate variable is the wildcard for a pair of co-ordinates and can
be used whenever a point is expected.