NAME

       doc_decisions_holes_mdHoles in KeySets
        - holes in config makes sense in the KeySet as today, but is maybe not a good idea for
       strongly hierarchically structured data.

       • allow specific overrides without override of structure below

       See [Hierarchy Example]/src/bindings/cpp/examples/cpp_example_hierarchy.cpp) for how to
       implement a hierarchy that gets rid of the problem that holes might create in this
       context.