Clarify usage of element etcsSpeedProfile

Using the attribute @etcsTrainCategoryNumber in element <speedProfile/trainType/etcsSpeedProfile> is unclear. As it refers to the ETCS variable NC_TRAIN, it is depending on the ETCS baseline, because NC_TRAIN values have different meaning in baseline 2 and baseline 3.

Links

• Forum discussion:
  • Thomas Nygreen, 24.12.2018: https://www.railml.org/forum/index.php?t=msg&th=627&start=0&
• Git issues:
  • #698
• Wiki documentation:
  • CO:speedProfile: https://wiki3.railml.org/wiki/CO:speedProfile

Proposed solution railML 3.4

@etcsTrainCategoryNumber shall be used only for ETCS baseline 2 data, whereas the physical parameters (@maxCantDeficiency, <trainType>@type and <braking>@airBrakeApplicationPosition) shall be used for ETCS baseline 3 data.

This usage constraint need to be documented.