Email from Brad Pierce dated
Although
I agree with the motivation for EN-33, I would like to propose a different
solution
(in Syntax 3-1, Syntax 3-3, Section A.2.2.1)
enum_name_declaration ::=
enum_identifier [ [ integral_number [ : integral_number
] ] ] [ = constant_expression ]
--
Brad
p.s. EN-6 is good.