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Service Interface for Real Time Information (SIRI) is a European standard for real-time information which has had limited adoption in the United States, but would be compatible with hardware and network systems which meet European standards. The GTFS family of standards could also be compatible with these systems. SIRI is based on the Transmodel abstract model for public transport information, and comprises a general purpose model, and an XML schema for public transport information.
SIRI allows pairs of server computers to exchange structured real-time information about schedules, vehicles, and connections, together with general informational messages related to the operation of the services. The information can be used for many different purposes, for example:
- To provide real time-departure from stop information for display on stops, internet and mobile delivery systems;
- To provide real-time progress information about individual vehicles;
- To manage the movement of buses roaming between areas covered by different servers;
- To manage the synchronisation of guaranteed connections between fetcher and feeder services;
- To exchange planned and real-time timetable updates;
- To distribute status messages about the operation of the services;
- To provide performance information to operational history and other management systems.
SIRI includes a number of optional capabilities. Different countries may specify a country profile of the subset of SIRI capabilities that they wish to adopt.