Expressions involving geometry / shapes - clarifications needed?

[havatv]

The expression documentation says:

area ( shape1 ) returns the area of shape1

In a thread on the mailing list, @sdlime tells Andrea to use area([shape]) > 10000000.
Andrea had used EXPRESSION ( (area([GEOMETRY]) > 10000000) ), which did not work. EXPRESSION ( (area([shape]) > 10000000) ) worked.

I guess that the documentation should be made more clear - perhaps some introductory text. shape1 and shape2 are used in the documentation.

I am not very familiar with this, so I would appreciate suggestions!