At first I did like that, but it left me with a code like:
```python
def _get_schema(self):
    """
    Some doc that is the same as for 'get_schema'.
    """
    return get_schema()
```
And it looked like a lot of code that can be avoided.

Do you know if there is a way to use an abstract method in BaseConfig and in a subclass just asign a method to it?
If don't, I think that the abstract limitations justify all that 'extra' code.