A Specification and Validation Technique Based on STATEMATE and FNLOG

Abstract

The paper presents a specification technique borrowing features from two classes of specification methods, formal and semi-formal ones. Each of the above methods have been proved to be useful in the development of real-time and critical systems and widely reported in different papers [1], [2]. Formal methods are based on mathematical notations and axiomatic which induce verification and validation. Semi-formal methods are, in the other hand, graphic, structural and user-friendly. Each method is applied on a suitable case study, that we regret some missing features we could found in the other class. This remark has motivated our work. We are interested in the integration of formal and semi-formal methods in order to lay out a specification approach which combines the advantages of theses two classes of methods. The proposed technique is based on the integration of the semi-formal method STATEMATE [3] and the temporal logic FNLOG [7]. This choice is justified by the fact that FNLOG is formal, deals with quantitative temporal properties and that these two approaches have a compatibility which simplifies their integration [7]. The proposed integration approach uses the notations of STATEMATE and FNLOG, defines a various transformations rules of a STATEMATE specification towards FNLOG and extends the axiomatic of the temporal logic FNLOG by new lemmas to deal with duration properties. The paper presents the various steps of our integration approach.Key wordsFormal methodsIntegrationReal-time SystemsSemi-formal methodsSpecificationTemporal logicValidationVerification