Rename not referencable ID attributes
There are some attributes which are named with 'ID' but which aren't bound to the base type tGenericID. This way they couldn't be securely referenced inside the XML file. They are purely "code" or "number" strings which have to be unique inside their regional domain.
This attributes should be renamed in order to reduce ambiguity.
- ocpTrackID in the IS element crossSection
- countryID in the IS element balise
- groupID in the IS element balise
- onBoardUnitID in the RS elements etcs, specificTransmissionModule, trainRadio, otherEquipment, nationalSystem