Defining 1mpt = 0.1mm would be just as good. Normal text would be 40mpt = 4mm = 11.33pt. But there are already metric point definitions: https://en.wikipedia.

Defining 1mpt = 0.1mm would be just as good. Normal text would be 40mpt = 4mm = 11.33pt. But there are already metric point definitions: https://en.wikipedia.org/wiki/Point_(typography) https://en.wikipedia.org/wiki/Point_(typography)