Pertains to the reference data model for public transport, based on: - the reference data model, EN 12896, known as Transmodel V5.1; - EN 28701, known as IFOPT; incorporating the requirements of: - EN 15531-1 to 3 and CEN/TS 15531-4 and CEN/TS 15531-5, Service interface for real-time information relating to public transport operations (SIRI); - CEN/TS 16614-1 and CEN/TS 16614-2, Network and Timetable Exchange (NeTEx), in particular, the specific needs for long distance train operation.