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The CEN 13149 series of products concerns on-board data communication systems on public transport vehicles. This series provides for data services that enable open and managed sharing of relevant information. This document, being Part 11 of the series, specifies a publication service for data provided by the vehicle platform, enabling all on-vehicle services to share a common understanding of the operational activity of the vehicle, based on inputs taken from chassis systems such as the J1939 CAN bus. It covers: — the functional scope, i.e. which data the service provides, why, when and how often. — the transport protocol, i.e. how the data are transmitted. — the service publication, i.e. how the service can be found by other modules or applications — the structure of the data, i.e. how the data are structured and how the data elements are named. This document implements the service framework described in CEN/TS 13149-7.