I'm not too familiar with the OSI structure, but in 3.7 I found the roles under "Vehicle Classification", see screenshot below. Is this something we need to change as we address all kinds of moving objects here?

Yes, we should also think about how to include it generically for all moving objects. But I though, we might want to harmonize the existing enum first.

We could just reference the existing enum definition in MovingObjectClassification or - for a cleaner result - move the role enum definition out of the VehicleClassification to be a generic enum definition (osi3::Role instead of osi3::MovingObject::VehicleClassification::Role) and then reference it in two places. I believe this should work in a backwards compatible way because we wouldn't change the data representation by moving enum definitions.

I can't judge the implications on backwards compatibility of your suggestion for the cleaner result, but it does seem like the better / less confusing approach.