Example 2: Private function definition
This example shows how to define a private function.
This function will not be visible to other modules because it is declared as
PRIVATE
for the module:
PRIVATE FUNCTION checkLength( name VARCHAR(50) )
DEFINE ok BOOLEAN
IF length(name) == 0 THEN
LET ok = FALSE
ELSE
LET ok = TRUE
END IF
RETURN ok
END FUNCTION