Откопал:
PTv2
If a stop is only for exiting or entering the vehicle (common for nightly services) the roles stop and platform should be replaced with stop_exit_only or stop_entry_only and platform_exit_only or platform_entry_only.
Inserting the stop_position is important to know where the vehicle stops. Inserting the platforms is needed for correct pedestrian routing.
PTv3
Roles for stops are the same: stop or platform (do not matter and may be omitted), entry_only, exit_only, and the same two with platform_ or stop_ prefix.