The Service Interface for Real-Time Information or Siri is the XML protocol to allow computers to be distributed to exchange real-time information about public transport services and vehicles.
This protocol is a CEN norm, originally developed as a technical standard with early participation by France, Germany (Verband Deutscher Verkehrsunternehmen), Scandinavia, and England (RTIG)
Siri is based on CEN Transmodel abstract model for public transport information, and consists of general purpose model, and XML schema for public transport information.
An SIRI White Paper is available for more information about protocol [1].
Video Service Interface for Real Time Information
Coverage
CEN Siri allows the server computer pairs to exchange real-time structured information about schedules, vehicles, and connections, along with information messages related to the operation of the service. Information can be used for various purposes, for example:
- To provide real-time departure from stop information to display on internet stop, internet, and delivery systems;
- To provide real time progress information about private vehicles;
- To manage the movement of buses that roam between areas covered by different servers;
- To manage a guaranteed connection synchronization between feeder and feeder services;
- To swap planned and real time schedule updates;
- To distribute a status message about the operation of the service;
- To provide performance information to operational history and other management systems.
CEN SIRI includes a number of optional capabilities. Different countries can determine the country's profile from the part of SIRI's capabilities that they want to adopt.
Maps Service Interface for Real Time Information
Architecture
The CEN Siri standard has two distinct components:
- SILE General Protocol Framework . This framework provides a uniform architecture for determining data messages either as a request/response pair or as a publish/subscription service. The payload model is separated from the messaging aspect so that the same payload can be used both in demand and subscription services and the same common message component can be used for all different functional services. Common functions for subscription management, service monitoring, content level authentication, etc. are provided.
- Functional Services Siri . The SIRI specification assigns a number of different functional services, each designed for the exchange of certain types of public transport data, all using the same protocol framework and basing their content on the Transmodel conceptual model. Additional functional services can be added that use the same framework but different content content models to include additional services.
Functional Services CEN Siri
SIRI V1.0 defines eight functional services;
- SIRI-PT: Planned Timetable service: Allows planned exchange of schedules for public transport services along the route.
- SIRI-ET: Estimated Service Time : Allows real-time exchange of schedules for public transport services along the route.
- SIRI-ST: Stop Timeetable Service: Allows planned departure and departure exchanges at termination of public transport services.
- SIRI-SM: Stop Monitoring Service: Allows real-time arrival and departure exchanges at public transport service stops.
- SIRI-VM: Vehicle Monitoring service: Enables real-time exchange of public transport vehicles.
- SIRI-CT: Time Connection Service : Allows planned connection exchanges from public transport services at the stop.
- SIRI-CM: Connection Monitoring service: Allows real-time exchange of connections from public transport services when stopped, taking into account delays.
- SIRI-GM Services: General Messaging : Enables simple message exchanges related to public transport services.
Two further functional services have been added as part of the CEN Siri specification;
- SIRI-FM: Facility Monitoring service: Allows real-time status exchange of facilities at bus stops such as elevators, escalators, etc.
- SIRI-SX: Situation Exchange Service : Enables the exchange of structured messages relating to public transport services and networks.
Other CEN standards that use the General Framework Protocols Siri
CEN SIRI Common Protocol Framework can be used by other standards to define their own Functional Services. The two CEN standards that do this are;
- The NeTEx Specification for the Public Transport reference data uses Shared CAT Protocol Templates to establish a Siri-based exchange service to exchange all types of NeTEx data elements in a frame.
- CEN's Open API for distributed travel planning using CEN Siri Common Protocol Framework to define protocols for trip planning.
Current & amp; Documentation
Version 2.0 of Siri [2], representing the published CEN document, is currently available as a set of XSD files packaged as a zip file [3].
- CEN TS 15531-1: 2015 - Part 1: Context and framework.
- CEN TS 15531-2: 2015 - Part 2: Communication Infrastructure.
- CEN TS 15531-3: 2015 - Part 3: Functional service interface (includes SIRI-PT, SIRI-ET, SIRI-ST, SIRI-SM, SIRI-CT, SIRI-CM, and functional services SIRI-GM).
- CEN/TS 15531-4: 2011 - Part 4: Functional service interface - Facility Monitoring.
- CEN/TS 15531-5: 2016 - Part 5: Functional service interface - Exchange Situation.
SIRI is managed under a maintenance regime, with version controls managed by the Working Group CEN TC/278 3. The next version of this scheme is available on the same site, along with the change notes.
History
The CEN SIR standard was developed from the European national standards for real-time data exchange, in particular the German VDV 453 standard, between 2000 and 2005, and including eight functional services. V1.0 became the CEN Technical Standard in 2006 and the full CEN standard in 2009.
Two additional functional services are added later Situation Exchange (SX) (Technical Standard 2009, Standard 2016) and Monitoring Facility (FM) (2011).
A number of small improvements are then added as informal changes create interim releases v1.1, v1.2, etc.
Two other CEN standards were developed that utilized the 'SIRI Joint Protocol Framework' to define their own functional services; NeTEx (v1.0 issued in 2014) and Open API for distributed travel planning (v 1.0 issued in 2017).
Version 2.0 of CEN-SIRI was developed between was adopted in 2015. It is compatible with V1.0 and both formalize the use of temporary enhancements and add a number of additional features. An important new addition to SIRI v2.0 is a description of a uniform transformation for rendering CEN-SIRI messages into a flat format that can be used in simple http requests without XML rendering.
Examples of sites that use Siri
Different SILE Implementations are used in a number of sites globally
Europe
- Travel Leicester: Real time bus from SIRI-SM http://leicestertravel.info/
- Transport for the London Incident from SIRI-GMS & amp; Real-time data from LBS River http://www.tfl.gov.uk
- Entur, Norway: A national hub for SIRI and NeTEx data http://www.entur.org/dev/sanntidsdata/
- VÃÆ'¤sttrafik, PTA for western Sweden, using SIRI ET and SX for real time information on trip planner: http://reseplanerare.vasttrafik.se/bin/query.exe/en
- Traveline Scotland: SIRI-SX for troubleshooting information http://www.travelinescotland.com
- Helsingin Seudun Liikenne, Finland using siri vm http://dev.hsl.fi/
North America
- New York City MTA BusTime - SIRI-SM and SIRI-VM - http://bustime.mta.info/wiki/Developers/Index
- Utah Transit Authority: http://developer.rideuta.com/StopMonitoringInstructions.aspx
- METRO (Houston, TX) Ã,: https://web.archive.org/web/20150111120549/http://developer.ridemetro.apiphany.com/products
Asia
- Ningbo City - Bus, Real time traffic control system with SIRI, station and vehicle electronic device 2011-2012 http://www.novasolution.com.hk
Australia
- Transport for New South Wales - SIRI-SX for troubleshooting information: https://transportnsw.info
See also
- Identification of Fixed Objects In Public Transport (IFOPT)
- NeTEx
- Intermodal Travel Planner
- Transmodel
- TransXChange
- Organization of transport standards
References
External links
- Siri on the VDV website
- The Siri on Transmodel website
- Transmodel
- NeTEx
- RTIG Website
- CEN Website
Source of the article : Wikipedia
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