Subclasses?

Is it possible to have a class composed of other classes? Or if not, if I have 20 classes as possible Backtrack in chaining context, is there a way to refer to them in 1 rule, rather than 20?

No, what you want is not possible right now.

You can only combine classes through fea code, which will then be combined into a single class.

You can only combine classes through fea code, which will then be combined into a single class.

Ad hoc or permanently?

It is from fea code to a single combined class.

See the fea specs:
http://adobe-type-tools.github.io/afdko/OpenTypeFeatureFileSpecification.html#2.g

Now that’s very useful to know :smiley: Dank u wel