Multi-level Animation and Validation Sample Clauses

Multi-level Animation and Validation. Thus far ProB only allowed single-level animation, i.e. the animator would animate a single refinement level in isolation. This meant that ProB was not able to detect a large class of potential errors in the model: • A broken gluing invariant. • An invalid witness. • Violation of guard strengthening. • Violation of variant decrease (resp. decrease or stability) for convergent (resp. anticipated) events. The new validation algorithm now can animate a range of refinements together. The user can decide which levels are to be animated together. As such, all of the above errors can now be detected by ProB. User experience is also improved, as he or she can inspect also the abstract variables. The new algorithm has been successfully applied to various case studies, and thus far up to 14 levels have been animated concurrently without problem.
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Multi-level Animation and Validation. We provide a detailed description of refinement in Event-B, both as a contribution in itself and as a foundation for the approach to simultaneous animation of multiple levels of refinement that we propose. We present an algorithm for simultaneous multi-level animation of refinement, and show how it can be used to detect a variety of errors that occur frequently when using refinement. The algorithm has been implemented in ProB and we applied it to several case studies, showing that multi-level animation is tractable also on larger models. Xxxxxx Xxxxxxxxxxx, Xxxxxxx Xxxxxxxx, Xxxxxx Xxxxxx. Refinement-Animation for Event-B --- Towards a Method of Validation. ABZ'2010 [4] See also Xxxxxx Xxxxxxxxxxx, Xxxxxxx Xxxxxxxx. How to Explain Mistakes. TFM'09. [5]

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