The bus open data service uses TransXChange for routes and timetable data exchange.
Version 1.1.A is the latest version of the profile documentation and can be located at:
Earlier versions of the profile can be found at the bottom of this page.
The v1.1.A is an update to v1.1, the changes largely being updates to fix implementation issues and inclusion of information on the BODS validator.
A track changes version of v1.1.A is provided with all changes since v1.1 identified and a summary of the changes in a slide deck are both available.