Assessment of Suitability of Event-B Sample Clauses

Assessment of Suitability of Event-B. Event-B is essentially a guarded command style language where events and guards can be specified using a simply typed first-order logic. Since the language is event-based, it is eminently suited for modeling behavior that can be captured well with state machines. Capturing algorithmic computation requires more effort and is in some cases even impossible since real numbers are not currently supported by the Event-B type system. An Event-B model has two parts: the context and the machine. Roughly speaking the context captures static definitions such as types while the machine models the behavior. Refinement can be used to split the modeling into several successive steps where each model provably is a behavioral refinement of the more abstract machines. This allows for some limited management of model complexity, but experience has shown that it mostly functions as an aid to manage proof complexity. Type system. The type system in Event-B is inadequate: • Event-B has no built-in support for record types. Though any record type can be simulated by means of functions and/or Cartesian products, such a simulation tends to complicate proofs. So, Event-B currently encourages “splitting” of records and then proceeding as if records had never existed. • Event-B’s support to enumerated types is insufficient though has been considerably improved in 2009. (Before the introduction of the partition operator to Event-B in 2009, it was very uncomfortable to express that differently named elements are different indeed. In the bug report [RD13] it is still shown how a fatal non-response situation in Rodin Platform gets caused by a partition expression used for defining an enumerated type of 80 elements.) In particular, there is no built-in support for the enumeration associated with an enumerated type. One may argue that it is a poor practice to be dependent on numeric values or on a total or partial order. However, as long as Event-B does not provide operators for non-numeric basic types, users of Event-B are essentially encouraged to use numeric types instead. • Event-B has no built-in support for real or rational numbers. Real numbers are compatible enough with the Event-B proof methodology, basically for the same reason why “non-Event-B” algebraic tools have for decades been used for handling real numbers without rounding. On the other hand, rounding errors are conceptually close to overflow errors that are already within the scope of Event-
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Related to Assessment of Suitability of Event-B

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  • STABILITY OF AGREEMENT Section 1 No amendment, alteration or variation of the terms or provisions of this Agreement shall bind the parties hereto unless made and executed in writing.

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