Common use of Choices / Decisions Clause in Contracts

Choices / Decisions. SVN Teamwork The desired objective of a plug-in that would bring support for Subversion in Rodin was to make a Rodin project compatible with standard SVN interface. Due to nature of the Rodin resource management, in particular the use of Rodin database and non-XMI serialisation, it turned out a hard task. A solution to this difficulty was to provide an alternative serialisation method, that would be compatible with Subversion interface. XMI serialisation has been chosen in the final plug-in, which together with Event-B EMF framework provides a shareable copy of the resources of a Rodin project and takes care of synchronisation between two. • Decomposition The two styles of decomposition use as criteria of partition two of the most important elements of an Event-B model: variables and events. The plug-in supports the two styles and allows the decomposition through a stepwise wizard or through a decomposition file (with extension .dcp) that can be stored are re-run whenever necessary. For the shared event decomposition, the user needs to selects which variables are allocated to which sub-component. For the share variable decomposition, the user selects which events with be part of which sub-component. The rest of the sub-component (which is no more than an ordinary machine) is built automatically (after some validations).