This quick "one line" shape may help you grasp Shape Description Language.
d1a90,.5
d1a90,.5
d1a90,.5
d1a90,.5
or
r{d1a90,.5}4
r repeat
{ open inline block
d1 draw line one inch long
a90,.5 arc 90 degrees with a radius of .5 inch
} close inline block
4 repeat inline block 4 times
If you are having trouble understanding how this sequence of commands produces the shape shown, please refer to the basic concepts.
