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The Standard Interface for Real-time Information or SIRI is an XML protocol to allow distributed computers to exchange real-time information about public transport services and vehicles.

The protocol is a CEN norm, developed originally as a technical standard with initial participation by France, Germany , Scandinavia, and the UK

SIRI is based on the CEN Transmodel abstract model for public transport information, and comprises a general purpose model, and an XML schema for public transport information.

A SIRI White Paper is available for further information on the protocol.

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