CORBA26 — CCM: import and re-opening of modules

In ccm/01-08-03, a sentence says "IDL module definitions may re-open
modules defined in imported name scopes."

Now, consider the following "well-defined set of IDL definitions":

module Y{};
module A{
module Y{};
};
module B{
module Y{};
};

and the import statements

import A;
import B;

Clearly, A::Y and B::Y are "modules defined in imported name
scopes". Does that mean that specifying

module Y{
interface another_interface{};
};

is now valid? If so, which namespace is extended?

It may be that this is meant to be an error (if so, where does it say
that?). In that case, consider the case that there was only a single
import:

import A;

Then, if this means that A::Y is extended, how could I specify a
re-opening of ::Y?

Alternatively, it may be that the authors thought of re-opening Y in
the form of

module A::Y{
interface another_interface{};
};

That, of course, is illegal syntax. Yet another interpretation is that
the draft intended to allow

module A{
module Y{
interface another_interface{};
};
};

However, this appears to be possible even without any import
statement.

See issue 4577.