CS 404: Solutions and Examples
FORTRAN subscript expressions.
I think he has in mind the discussion of limited FORTRAN
subscripting on pp. 73, 74.
With that in mind...
Where <identifier> and <integer> are defined on p. 165.
Note that there are some things we don't describe with this
notation. Specifically, that the variable names do not exceed 6 characters,
and that the variables are integers. The former is possible with BNF,
but niggling. The latter is not possible in BNF.
