Comment 12 for bug 1977873

We usually don't need to define classes and most files don't have them, just the source and target types. We could add a follow-up patch with 'class process' but I don't think it's necessary personally, though I wouldn't block it either.

I've been looking through the commits for 3.4 and finding a lot of "validation"-type commits too, so I think that makes sense.