What is the FaceBioFile good for?

I have just came across the FaceBioFile, which simply derives from bob.bio.base.database.file.BioFile without adding any functionality: https://gitlab.idiap.ch/bob/bob.bio.face/blob/master/bob/bio/face/database/database.py#L13

Why do we have this extra level of abstraction/inheritance? Can't we simply use the bob.bio.base.database.file.BioFile directly, wherever we use FaceBioFIle now?

ping @andre.anjos @amohammadi @tiago.pereira @sebastien.marcel