Service Interface for Real Time Information
Under the terms of the CEN European Standardisation process, once ratified, formal standards documents, including the SIRI Technical Specification, must be obtained from the respective national standards body, for example BSI, VDV, CERTU, etc. (Unfortunately we are not allowed to make them freely available). Earlier drafts may be circulated to interested parties for comment.
Only the SIRI schemas are available for free download on this site- see below
SIRI uses a systematic versioning scheme. This aims to mark any change to the schema with an explicit version.
For example the version 2.0 schema is found at
To use the SIRI schema, you may either reference the URL for the appropriate version, or use a local copy held on your own machine, which you can downloaded from this site.
The SIRI WG endeavour to keep changes backwards compatible - that is documents conformant with previous releases will still be conformant with subsequent releases, and documents conformant with subsequent reelases will conform to earlier releases provdied they do not use new features.
To overcome earlier tool limitations, the original 1.0 SIRI schema used a single chameleon namespace (http://www.siri.org.uk/. ) for all include packages .
Subsequent version of the schema (1.2a, 1.3..) use an explicit namespace for each siri package (http://www.siri.org.uk/siri) and respect the namespaces of other packages eg ifopt." .
Users are recommended to use a version of SIRI with the explicit namespaces as this now works better with tools.
Downloadable versions of SIRI XML Schema
The following recent and upcoming versions of SIRI schemas & documents may be accessed online, and also can be downloaded in the formats shown.
© Copyright CEN SIRI & 2004 - 2013