Using SIRI

SIRI formats

SIRI is a protocol for data exchange between two IT systems for real-time information. Data can be exchanged via:

• XML files (over TCP/IP or via SOAP/WSDL)

• REST/JSON (over HTTP) using SIRI-Lite interface

Note: SIRI-Lite is a subset of SIRI focusing on the most frequently requested information for open data feeds.

JSON as an Alternative to XML in SIRI

While XML remains the primary data format for SIRI, JSON is also used as a lightweight alternative. However, it's important to note that JSON is not a direct replacement for XML. JSON's simplicity and efficiency make it suitable for small data exchanges, but for large datasets, XML's ability to parse data line by line within a time window offers a performance advantage.

IDFM's REST/JSON Implementation

IDFM (Ile de France Mobilité - Authority from Paris Area) has implemented a REST/JSON access point by directly converting the original XML data to JSON. This approach provides a convenient and lightweight alternative for accessing SIRI data.

Additional Resources

For further insights into using JSON in SIRI, refer to SIRI Part 2 and the Proposition-Profil-SIRI-Lite-initial-v1-2.pdf report.

How to use example files

Request/Response & Subscribe/Publish Protocol (The different types of flow are described here)

• SIRI supports a synchronous request/response protocol and an asynchronous subscribe/publish protocol.
• Data exchange involves a request message from a client consumer and a corresponding response message from a producer server.
• Clients can subscribe to information by sending a message with request details and sensitivity criteria to filter messages.
  • The producer server maintains subscriptions and sends messages to consumers when criteria are met.

In each of the services, you will find typical examples of requests and responses, as well as examples of subscription and publication. Examples are based on use cases

Name	Description	link to example file
siri_exa_framework	Establish the basis for data exchange in SIRI with request/response and subscribe/publish protocols	link
siri_exm_CM	Provide information about the expected arrival of a feeder vehicle to the operator of a connecting distributor service	link
siri_exm_CT	Provide information about the scheduled arrivals of a feeder vehicle to the operator of a connecting distributor service.	link
siri_exm_ET	Provision of information on the actual progress of Vehicle Journeys operating a specific service Lines, detailing expected arrival and departure times at specific stops on a planned route.	link
siri_exm_FM	Allows the exchange of the real-time status of facilities at a stop such as lifts, escalators, etc.	link
siri_exm_GM	Exchange informative messages between identified individuals in free or an arbitrary structured format.	link
siri_exm_PT	Provision of information on the planned progress of vehicles operating a specific service.	link
siri_exm_SM	Provision of information on services due to call at a stop.	link
siri_exm_ST	Provide a stop-centric view of timetabled vehicle arrivals and departures at a designated stop.	link
siri_exm_SX	Exchange incident and road performance data.	link
siri_exm_VM	Provision of information on the current location and status of a set of vehicles.	link
siri_exu_capability	Verification of the SIRI services supported by the feed.	link
siri_exu_discovery	Description of the mobility network and services covered by the given SIRI feed	link

SIRI National and EU minimum profiles inventory

SIRI national profile

Profile Name	Availability	EU Minimum SIRI profile compatible	Documentation
Nordic (Norway, Sweden, Finland, Denmark)	Specified and in use	✅	Nordic SIRI profile
UK (GB)	Specified and in use	✅
France (FR)	In use in numerous cities and regions	✅
Netherlands (NL)	Specified but not yet in operation	✅

Data categories

Level of service (LOS)	Static data
LOS 1	Dynamic travel and traffic data - Level of service 1
LOS 1-1	Disruptions (all modes)
LOS 1-2	Real-time status information — delays, cancellations, guaranteed connections monitoring (all modes)
LOS 1-3	Status of access node features (including dynamic platform information, operational lifts/escalators, closed entrances and exit locations — all scheduled modes)
LOS 2	Dynamic travel and traffic data - Level of service 2
LOS 2-1	Estimated departure and arrival times of services
LOS 2-2	Current road link travel times
LOS 2-3	Cycling network closures/diversions
LOS 2-4	Availability of publicly accessible charging stations for electric vehicles and refuelling points for CNG/LNG, hydrogen, petrol and diesel powered vehicles
LOS 2-5	Car-sharing availability, bike sharing availability
LOS 2-6	Car parking spaces available (on and off-street), parking tariffs, road toll tariffs
LOS 3	Dynamic travel and traffic data - Level of service 3

Dynamic travel and traffic data - Level of service 1 (LOS 1)

Data Categories	FR	NL	Nordic (SE, NO, DK, FI)	GB
LOS 1-1	✅	✅	✅	✅
LOS 1-2	✅	✅	✅	✅
LOS 1-3	✅	✅	✅

Dynamic travel and traffic data - Level of service 2 (LOS 2)

Data Categories	FR	NL	Nordic (SE, NO, DK, FI)	GB
LOS 2-1	✅	✅	✅	✅
LOS 2-2			✅
LOS 2-3
LOS 2-4
LOS 2-5	✅		✅
LOS 2-6	✅		✅

Dynamic travel and traffic data - Level of service 3 (LOS 3)

Data Categories	FR	NL	Nordic (SE, NO, DK, FI)	GB