BaseLanguage @Deprecated - Write ObjC and C# representation in MPS

Hi,
I'm trying to learn how to build a language representation in MPS for exist language.
I'm reading BaseLanguage code to see how it was built butI see it has a lot of @Deprecated all over the place.

I'm trying to write very limited representations of ObjectiveC and C# in MPS. By limited I mean I'm only starting from been able to declare a class with some fields and methods, no generic or even inheritance at this stage (hopefully it will come later).
Does anyone have a reference of any other language beside BaseLanguage that was implemented in MPS?
I did saw the JavaScript representation, that actually help a lot but it's a bit to simple to manage to translate that to other languages.

Thank you,
Ido.