Pertains to the Public transport reference data model based on: - the Public transport reference data model published 2006 as EN 12896 and known as Transmodel V5.1; - the model for the identification of fixed objects for Public transport, published in 2009 as EN 28701 and 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);and - CEN/TS 16614-1 and CEN/TS 16614-2, Network and Timetable Exchange (NeTEx).