Kenneth Lundin wrote:
>
> Hi,
>
> Some compilers and syntax checkers seems to approve this way of writing
> contraints:
>
> S ::= IA5String (SIZE (1..128)) (FROM ("0123456789#*,"))
>
> But I cannot understand (at least not from X.680 1997) why it is
> allowed.
It is allowed because of the two productions:
In chapter 16.1 use third alternative of:
Type ::= BuiltinType | ReferencedType | ConstrainedType
In chapter 44.1 use first alternative of:
ConstrainedType ::= Type Constraint | TypeWithConstraint
this gives you the possibility to construct:
Type Constraint Constraint Constraint etc.
Best regards
Egon Andersen
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