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The main objective of the present Standard is to present 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 2009 as EN 28701and 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. Particular attention is drawn to the data model structure and methodology: — the data model is described in a modular form in order to facilitate understanding and use of the model; — the data model is entirely described in UML. In particular, a reference data model kernel is described, referring to the data domain: — network description: routes, lines, journey patterns, timing patterns, service patterns, scheduled stop points and stop places. — This part corresponds to the network description as in Transmodel V5.1 extended by the relevant parts of IFOPT.