Enhancement request to support nested classes

[e-dana]

I'm working on a project to bring in existing code to model and refactor. I'm mostly interested in the structural model.
The source code (C/C++) structure is translated to TextUML and them imported into a UML editor/modeler.
The issue I'm having is that nested classes are not supported. Flattening a nested class is time consuming and not realistic, given
the number of lines of code I'm working with. I've tried writing code to auto-flatten the class, but there too many issues to do this
cleanly. UML does support nested classes. While I understand the undesirability of nesting a class, having this capability supported would save a great deal of time and effort.

Examples I'm looking to support (based on real C/C++ code):

1. Simple 'typedef'.

import mdd_types;

class beta
    attribute prime : Integer;
end;

class foo
    class myType specializes some_other_type;
        attribute something_special : String;
    end;
    attribute alpha : myType;
end;

2. Nested enumeration.

class bar
    enumeration DeviceState
        ON;
        OFF;
    end;
    attribute power_switch : DeviceState;
end;

While these are simple examples, the code base is more complex.