© 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor...
-
Upload
lee-singleton -
Category
Documents
-
view
218 -
download
4
Transcript of © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor...
![Page 1: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/1.jpg)
© 2004Kizoom
1
SIRI - Service Interface for Real Time Information
(CEN-OO278181 ) http://www.siri.org.uk
27- 29 Cursitor StreetLondon, EC4A 1LT
Siri 0.1g v3.6c
![Page 2: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/2.jpg)
© 2004Kizoom
2
Topics
• Overview– Key Points – Motivation– Underlying standards
• Specific Functional Services• Transport & Communications • What do you need to do to Implement Siri?• Roadmap
– Some Possible Future Work Items
![Page 3: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/3.jpg)
© 2004Kizoom
3
SIRIOverview
![Page 4: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/4.jpg)
© 2004Kizoom
4
SIRI – Introduction• Real-time Server-to-Server Services for
Public Transport– Defines a Service Interface for exchanging real-
time information of public transport networks.– Complements an underlying static information
model for network and timetable description (TRIDENT,VDV, TransXChange)
– Provides information on any change on the timetabled information, from original publication to the actual & predicted transport running times.
![Page 5: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/5.jpg)
© 2004Kizoom
5
Gene Pool
![Page 6: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/6.jpg)
© 2004Kizoom
6
Based on• Underlying Standards
– Public Transport Data• TransModel : Terminology, model (isomorphic)• VDV 453, 454, Trident, RTIG-XML
– Real systems & experience!• GML, WGS84
– Technology• XML, XSD• WS-Soap, WS-PubSub Web Service enabled• UML, ISO 24531, RFC
• Participants– Germany (VDV453, VDV 454)– France (Trident, TransModel)– UK (RTIG-XML, Trident, TransModel)– Denmark, Sweden, Norway, (PubTrans)– Czechoslovakia
![Page 7: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/7.jpg)
© 2004Kizoom
7
SIRI Key Points• Approach
– Defines Functional services (real-time)– Defines an independent communication layer
(may be reused elsewhere)– SIRI does not define the underlying object
structure and data-model (Stop Points, Lines, Route, etc.) :
• Assumed to be TransModel compliant
• Practical / Pragmatic– SIRI is a tool box, well designed for an
incremental implementation– It is not a Panacea ….– Compromises to accomodate real systems
• Includes compromises to facilitate migration
![Page 8: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/8.jpg)
© 2004Kizoom
8
Motivation - Uses of SIRI Services
• Rapid growth in real-time info - makes Public Transport more efficient to operate & more attractive to use.– Provision of Real time Service Information to Passengers.
• At Stop, On board, tethered & mobile internet– Provision of Information to Journey Planners.
• Real-time augmented– Facilitating Connections for Passengers. – PT Fleet and Network Management.– General Business Communication.
• E.g. Adherence to schedule
• Growth of mobile & internet – On-line, real time data. Roaming!– Ubiquitous embedded computing
![Page 9: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/9.jpg)
© 2004Kizoom
9
Motivation – Linking up• Orchestrating Multiple Actors in federated
systems– Passenger information services involving multiple
providers• Connection/interchange information• Stop Point/Station operated by several transport operators• etc.
– Services between different operators• Single PT line – several operators• Connection management
– Services with other content providers• To provide information to content providers• To get information from content providers
![Page 10: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/10.jpg)
© 2004Kizoom
10
Motivation - Standards• Value to Passenger Transport Executives and Authorities /
Operators as Customers– Open, modular architectures & supplier independence.– Protection of investment.– Efficient tender specification criteria.
• Value to Suppliers– European economies of scale & markets.– Reduced complexity & deployment costs– More reuse, Cheaper integration– Simplified tendering, quality differentiator.
• Value to Both– Enables new types of services– European economies of scale– Lowers costs - creating new markets– Modern, Modular, scaleable architectures– Harnesses open internet standards
![Page 11: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/11.jpg)
© 2004Kizoom
11
The SIRI Specifications
• SIRI Documents (Completed 2005)– Technical Standard
Part 1: Context and Framework
Part 2: Communications Infrastructure
Part 3: Functional Service Interfaces
– Supporting XML Schema – W3C .XSD• Modular package structure, one per service• Support WSDL /SOAP binding using same xsd schema
• Migration path from existing standards– Country Profiles & Guidance Notes
![Page 12: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/12.jpg)
© 2004Kizoom
12
Web Site
http://www.siri.org.ukhttp://www.siri.org.uk
![Page 13: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/13.jpg)
© 2004Kizoom
13
SIRI Approach & Services
• Separation of Concerns– Transport layer is separate – Web Service architecture (http &/or SOAP…..)– SIRI General Communications Services
• Common to all types of Functional Service• Robust, scaleable, architecture for Real-Time• Tuneable for efficient deployment
– SIRI Functional Services • Timetables & Timetable Changes • Stop Events (Arrivals & Departures) • Vehicle Movement • Connection Protection (Timetables, Events)• General Informative Messages
![Page 14: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/14.jpg)
© 2004Kizoom
14
Support Different Operation Models
• The same Interfaces can be used for different operational models
Vehicle tracking and management
Information for
passengers
Bus 1 Bus 2
RTI core data model
Prediction generator
(a) UNITARY single control and information centre
Information for
passengers
Bus 1
Vehicle tracking and management
RTI core data model
Prediction generator
(b) INTEGRATORseparate control and information centres
Bus 2
Vehicle tracking and management
![Page 15: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/15.jpg)
© 2004Kizoom
15
Support Different Environments
• Able to optimise for different operational characteristics– High/Low bandwidth– Fast/slow processors – Hi/Low traffic– Large/small networks– Sparse /dense usage– Central or distributed
• Evolvable– Able to implement on different generations of
technology– Allow modular, incremental implementation: roadmap
![Page 16: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/16.jpg)
© 2004Kizoom
16
SIRI Functional Services
![Page 17: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/17.jpg)
© 2004Kizoom
17
SIRI Timetable Services
• Production Timetable (PT)– Distribute latest timetable
• Schedule to AVMS• AVMS to client
• Estimated Timetable (ET)– Distribute latest timetable including real-time
• Cancellations, additions, short working• Realtime-predictions
![Page 18: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/18.jpg)
© 2004Kizoom
18
SIRI Stop Services
• Stop Timetable (ST)– Distribute latest timetable
• Stop Centric Timetables• Provisions Clients with latest data.
• Stop Monitoring (SM)– Real time Arrival & Departure Boards
• Arrivals, Departures, pass-throughs• At stop, onboard, away
![Page 19: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/19.jpg)
© 2004Kizoom
19
SIRI Connection Services
• Connection Timetable (CT)– Distribute planned interchanges
• Stop Centric • Provisions Clients.
• Connection Monitoring (CM)– Connection management– Guaranteed connection support
![Page 20: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/20.jpg)
© 2004Kizoom
20
SIRI General Message Services
• General Message (GM)– Exchange Structured Messages
• Simple or embedded structures (eg TPEG, Trident etc)
• Situation, operational, and general info messages
![Page 21: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/21.jpg)
© 2004Kizoom
21
PT Systems & SIRI Interfaces
a a
Generic model of PT operations, showing exchange points for RTI
![Page 22: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/22.jpg)
© 2004Kizoom
22
Example 1: Hamburg
• Federated Modes & Regions
![Page 23: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/23.jpg)
© 2004Kizoom
23
Example 2: Copenhagen
• Integrator
![Page 24: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/24.jpg)
© 2004Kizoom
24
Example: Isle de France
• Hybrid
![Page 25: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/25.jpg)
© 2004Kizoom
25
Transport & General
Communications
![Page 26: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/26.jpg)
© 2004Kizoom
26
Transport & Communications
• Common Protocols for all SIRI Functional Services– Independent of Functional Message Content– Based on new Web services standard Ws-
PubSub, Ws-Address etc (W3C) – Communications Transport Independent
• XML + http POST, • WSDL SOAP Binding
![Page 27: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/27.jpg)
© 2004Kizoom
27
SIRI Communications Layer
• Common to all Functional Services
SIRI interface
Service 1 –used
Organisation 1or System 1
Organisation 2or System 2
Communications Service Layer – common
Service 2 –not used
Service n –used
Service 3 –not used
)…
sends receives
![Page 28: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/28.jpg)
© 2004Kizoom
28
Common Communications Services
• General Functions Common to all SIRI Service Types– Subscription Management– Recovery & Restart– Access Controls – Who is allowed to access?– Versioning – Allows distributed upgrades– Discovery – Which systems have which data?
• Some Capabilities are Optional
![Page 29: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/29.jpg)
© 2004Kizoom
29
Communications Framework Patterns
• Alternate Patterns of Interaction1. Request/Response vs. Publish/Subscribe
• Choose for scaleability & responsibility
2. Direct Delivery vs. Fetched Delivery• Allows efficient implementation choices
3. Notification Mediation• Reduces traffic for publish subscribe
– Last Update, Change Threshold,– Subscriber Groups
![Page 30: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/30.jpg)
© 2004Kizoom
30
Interaction 1- Request/Response
![Page 31: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/31.jpg)
© 2004Kizoom
31
Interaction 2- Publish/Subscribe
![Page 32: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/32.jpg)
© 2004Kizoom
32
Delivery - Direct
![Page 33: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/33.jpg)
© 2004Kizoom
33
Delivery - Direct & Fetched
![Page 34: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/34.jpg)
© 2004Kizoom
34
Mediation
• Filtering of Data & Notifications to Reduce data traffic– Incremental Data Changes:
• Only send data changes since last update
– Change threshold • Only notify if change is more than a certain amount
– Grouping of subscriptions • One notification for changes to many subscriptions
in a group
![Page 35: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/35.jpg)
© 2004Kizoom
35
Mediation - Efficiency
• Reducing Traffic
![Page 36: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/36.jpg)
© 2004Kizoom
36
Mediation
• Interaction of simple patterns can be quite complex.
![Page 37: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/37.jpg)
© 2004Kizoom
37
SIRI What do you need to do to implement
SIRI ?
![Page 38: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/38.jpg)
© 2004Kizoom
38
How to Implement SIRI #1
• Select the parts of SIRI you need, – Timetables, Stop Monitoring, etc– Discovery, Access Control
• Select your transport protocol (SOAP, HTTP post, XML anything else…) – Select additional Web Service (encryption,
authentication, etc.)
• Select non-mandatory fields (XSD)• Define any needed extensions
– Embeddable any data types
![Page 39: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/39.jpg)
© 2004Kizoom
39
How to Implement SIRI #2
• Agree Local Reference data – Identify partipant « peers » – Line Ids– Stop Point Ids (and Stop Point kind…)– Connections Ids– Supported values (ServiceCategory,
ProductCategory, VehicleFeature)
– Geospatial Coordinate System
![Page 40: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/40.jpg)
© 2004Kizoom
40
How to Implement SIRI #3• Agree Local Communication & Mediation Options
– Interaction Patterns• Request / Response• Publish / Subscribe
– Delivery Pattern• Direct only (or Fetched delivery DE)• Multiple Subscriber Delivery
– Transport & Comms• http POST / WSDL
– Recovery• Heartbeat for PubSub• Acknowledgement of notifications – or not
– Mediation• Simple or multiple subscriber filters,• “Stop VisitNumber”
![Page 41: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/41.jpg)
© 2004Kizoom
41
SIRI Further Roadmap
![Page 42: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/42.jpg)
© 2004Kizoom
42
SIRI – Status
• Final Draft Awaiting Vote
• Next WG Meeting Feb 6/7 2006
• Possible Work Items
• Interoperability / Datex?
• Some Services live already!
![Page 43: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/43.jpg)
© 2004Kizoom
43
Possible Additional Work Items• Real-time Facility Changes Service FR
– Allows changes to availability of facilities and equipment of stop, vehicle and service to be exchanged in real time . This can be used for example to communicate equipment changes affecting impaired access to PT such as lift or escalator changes. Information is of use to real-time journey-planning and alert services. Should consider interchange aspects.
• Situation/Event Structured Incident model UK/FR– Enhance GMS to have preferred structured incident model for describing
disruptions to services, model relates to SIRI, Based on TPEG + TransModel
• Control Actions Server Interface SE – Service for distributing control actions amongst participants, for example
for coordinating management of late services. • Traffic Status / Prioritisation Interface for UTMC UK/DE
– Allows real-time public transport management systems to exchange information with road UTMC systems, eg to provide real time delay information a road speed information to the road traffic management system, or to allow for the exchange of signal priority options.
![Page 44: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/44.jpg)
© 2004Kizoom
44
SIRI
DataContent
ExchangeBehaviour
TransportProtocol
well-defined interactionswith XML schemarepresentations
Mainstream Internet•HTTP POST,•SOAP.
definedXML SchemaFor payload
XML XML Http Post
SOAP
TransModel WS-PubSub
http get ?
IP
![Page 45: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/45.jpg)
© 2004Kizoom
45
DATEX II
DataContent
ExchangeBehaviour
TransportProtocol
defined XML schema (draft, work in progress)
D2 deliverablespecifies…may be revised?
in progress for2006 publicationHTTP GET, POST,SOAP.
![Page 46: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/46.jpg)
© 2004Kizoom
46
Some Conclusions
• TransModel invaluable– Vocabulary & concepts– Tool for harmonisation legacy standards
• Message architectures critical for real time efficiency– Based on proven architectures
• Modularity for legacy migration– Incremental implementations, optional features– XML allows flexible coupling– Road map for additional features
![Page 47: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/47.jpg)
© 2004Kizoom
47
SIRI Further Technical Points
![Page 48: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/48.jpg)
© 2004Kizoom
48
SIRI XSD Packages – Layered Reuse
Common
Request Management
Common
Request Management
SIRI Functional Services
SIRI Functional Services
Low Level TypesLow Level Types SIRISIRICommon
ModelCommon Model
![Page 49: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/49.jpg)
© 2004Kizoom
49
Recovery & Restart
• Subscriber is responsible for recreating subscriptions on restart,
• Consumer is responsible for Detecting Loss– Check Status– Heartbeat
• Consumer must know Subscriber!
![Page 50: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/50.jpg)
© 2004Kizoom
50
Subscription Management
• Roles “Stateful pattern of interaction”– Subscriber assigns identifier– Notification Producer grants new subscriptions– Subscription manager handles any changes
• Notification Producer & Manager know each other
• Management Messages– SubscriptionRequest
• SubscriptionIdentifier
– SubscriptionResponse• Granted or refused
– TerminateSubscriptionRequest
![Page 51: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/51.jpg)
© 2004Kizoom
51
Extensions
• Access Control– Well defined Capabilities– Request based Checking
• Discovery– Capability– Coverage
• Stops• Lines• Product, Service, Vehicle - Features /Attributes ?
![Page 52: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/52.jpg)
© 2004Kizoom
52
Access Controls
• Optional Capability on Requests– By ParticipantCode
• Configuration Matrix• Restrict By
– By Function &/or Capability (Static)• E.g. Stop Events, Vehicle Movements
– E.g. Subscribe, detail level – By Topic (Dynamic)
• E.g. Certain Stops, Certain Lines
– By Resource level (Dynamic)
![Page 53: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/53.jpg)
© 2004Kizoom
53
Appendix
![Page 54: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/54.jpg)
© 2004Kizoom
54
Technical Challenges
• How to give migration path from existing standards– VDV, RTIG, TRIDENT– Allow alternative delivery patterns– Allow alternative formats for some detailed response messages
where necessary. Semantically identical.– Allow modular, incremental implementation: roadmap
• What is canonical TransModel XML?– Trident XML not being kept current
• Further improvements in TransModel since Trident• New developments/standards in XML / WS technology• Further application requirements for SIRI
• What real-time efficiency optimisations are needed?– Principle of strict Transmodel Isomorphism ?– Allow different message patterns and tradeoffs
![Page 55: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/55.jpg)
© 2004Kizoom
55
Acceptable Optimisations =TransModel Isomorphic?
A
B
F
C
D
*
*
Bs
Cs
E
G *
1 1
A
X(C+D+E)
* Cs
G
1
1
1
1
*
A
B
C
D
*
*
Bs
Cs
E
G
*
1
1
1
1
OK NOT OK
Compression
Compounding
*
![Page 56: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/56.jpg)
© 2004Kizoom
56
SIRI Data Models • TransModel based; Small Subset • Common Concepts& Elements
– Participants (Systems)– StopPoints (Pluggable to national systems)– Lines, Directions– Journeys,
• VehicleJourneys & Calls• DatedVehicleJourneys & Calls• MonitoredVehcielJourneys & Calls• ConnectingJourneys
– Features• Service• Vehicle• Product
• Common Structures– Isomorphic optimisations of TransModel for use in
interface
![Page 57: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/57.jpg)
© 2004Kizoom
57
Example Stop Monitoring Request
<ServiceRequest> • <RequestorRef>NADER</RequestorRef>• <RequestTimestamp>2004-12-17T09:30:47-05:00</RequestTimestamp>• <StopMonitoringRequest version=“1.0”>• <!-- All services from stop EH00001 in the next 30 mins-->• <RequestTimestamp>2004-12-17T09:30:47-05:00</
RequestTimestamp>• <!--=======TOPIC ======= -->• <PreviewInterval>P30M</PreviewInterval>• <MonitoringRef>EH00001</MonitoringRef>• <!--=======POLICY===========-->• <MaximumStopVisits>7</MaximumStopVisits>• <MinimumStopVisitsPerLine>2</MinimumStopVisitsPerLine>• <StopMonitoringDetailLevel>normal</StopMonitoringDetailLevel>• </StopMonitoringRequest></ServiceRequest>
![Page 58: © 2004Kizoom 1 SIRI - Service Interface for Real Time Information (CEN-OO278181 ) 27- 29 Cursitor Street.](https://reader036.fdocuments.us/reader036/viewer/2022062717/56649e395503460f94b2b639/html5/thumbnails/58.jpg)
© 2004Kizoom
58
Example Stop Monitoring Delivery• <StopMonitoringDelivery version="0.1d">• <ResponseTimestamp>2004-12-17T09:30:47-05:00</ResponseTimestamp>• <SubscriberRef>NADER</SubscriberRef>• <SubscriptionRef>2004-12-17T09:30:47-05:00</SubscriptionRef> • <!--====FIRST ARRIVAL ============================================ -->• <MonitoredStopVisit>• <RecordedAtTime>2004-12-17T09:25:46-05:00</RecordedAtTime>• <MonitoringRef>HLTST011</MonitoringRef>• <MonitoredVehicleJourney> • <LineRef>Line123</LineRef>• <DirectionRef>Out</DirectionRef>• <FramedVehicleJourneyRef>• <DataFrameRef>2004-12-17</DataFrameRef>• <DatedVehicleJourneyRef>034567</DatedVehicleJourneyRef>• </FramedVehicleJourneyRef> • <PublishedLineName>123</PublishedLineName>• <DestinationName>Paradise Park</DestinationName> • <VehicleRef>VEH987654</VehicleRef>• <MonitoredCall>• <VisitNumber>0014</VisitNumber>• <VehicleAtStop>false</VehicleAtStop> • <AimedArrivalTime>2004-12-17T09:40:44-05:00</AimedArrivalTime>• <ExpectedArrivalTime>2004-12-17T09:40:46-05:00</ExpectedArrivalTime>• <AimedDepartureTime>2004-12-17T09:42:47-05:00</AimedDepartureTime>• <ExpectedDepartureTime>2004-12-17T09:40:47-05:00</ExpectedDepartureTime>• </MonitoredCall> • </MonitoredVehicleJourney>• </MonitoredStopVisit>• ……..• </StopMonitoringDelivery>