Event-B XText Front-end User Guide

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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 Event-B XText Front-end page.



Release Notes

See Event-B XText Front-end Release Notes


  • Currently, Event-B XText front-end ONLY supports "standard" Event-B machines and contexts.
  • 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 the Event-B XText Front-end if you use modelling plug-ins such as iUML-B state-machines and class-diagrams, as the additional modelling elements will be over-written.


Event-B Explorer

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



  • Any file with extension bucx will be recognised as XContext file. As a result, XContext file can be created by the standard New File wizard of Eclipse.
  • The XText syntax of XContext file is as follows.
 XContext returns econtext::Context:
   (comment=(ML_COMMENT | SL_COMMENT))?
   'context' name=ID
   ('extends' extends+=[econtext::Context]+)?
   ('sets' sets+=XCarrierSet+)?
   ('constants' constants+=XConstant+)?
   ('axioms' axioms+=XAxiom+)?
 XCarrierSet returns econtext::CarrierSet:
   (comment=(ML_COMMENT | SL_COMMENT))?
 XConstant returns econtext::Constant:
   (comment=(ML_COMMENT | SL_COMMENT))?
 XAxiom returns econtext::Axiom:
   (comment=(ML_COMMENT | SL_COMMENT))?
   name=XLABEL predicate=STRING (theorem?='theorem')?
 terminal XLABEL returns ecore::EString:
   '@' !(':')+ ':'


Converting Rodin files to Event-B XText