OMR and multi-set official models

[Philippe Hurbain]

The "rules" are flexible. What do you suggest?

I propose using + as a concatenation indication for set number and set name. In the case of main set + accessory, use main set # and name first. For similar set, use lower set number set first.
I don't know of 3 or more set combos, but that would work too - at the cost of very long name.