CORBA23 — IDL struct issue

Summary: IDL structs are specified to have "one or more" members rather than
"zero or more".

Whilst it might be argued from a stylistic point of view that an empty
struct is of limited use, of should be avoided, there are places where
it may be desirable to specify a placeholder struct for later expansion,
or for machine generated code where there happens to be nothing to fill
the struct with.

I can see no compelling technical reasons for requiring that a struct
contain at least one member, so I propose that the grammar be revised to
alow for a struct with zero members.

Such a change would not break any existing IDL.

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