CamilleX User Guide

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The complete XEvent-B User Guide is available as pdf here. Some important information is listed below.


The Event-B XText front-end provides text editors for XContexts and and XMachines which then compiled automatically to Event-B contexts and machines.
For more details about the principles of this editor, see the XEvent-B page.




  • By default, XContext files (extension .bucx) and XMa- chine files (extension .bumx) are not displayed in the Event-B Explorer. To enable this, select Customize view for Event-B Explorer and uncheck the option All files and folders.

Release Notes

See XEvent-B Release Notes


  • Currently, XEvent-B supports "standard" Event-B machines and contexts and machine inclusion/event synchronisation mechanisms.
  • Since the XContexts and XMachines are compiled to the Rodin files, the corresponding Rodin contexts and machines will be OVER-WRITTEN. Any changes in the Rodin files will not be lost.
  • DO NOT USE XEvent-B if you use modelling extensions such as iUML-B state-machines and class-diagrams, as the additional modelling elements will be over-written.
  • Windows users must change the workspace text file encoding to UTF-8. This can be updated under the Rodin Preferences: General/Workspace then in the Text file encoding section, select Other: UTF-8.


  • Converting to XText: Currently, the "extended" attribute of events are not serialized.
  • Machine Inclusion:
    • Currently a machine can be only included if it is in the same project.
    • Including the same machine to both the abstract and its refining machine can result in the repetition of invariants.