6th Refinement Workshop: Proceedings of the 6th Refinement by David Garlan (auth.), David Till MA (Oxon), MSc (eds.)

By David Garlan (auth.), David Till MA (Oxon), MSc (eds.)

The 6th Refinement Workshop happened at urban collage in London from fifth to seventh January 1994. the current quantity comprises all the papers which have been submitted and approved for presentation, including papers through invited audio system. The workshops within the sequence have typically happened at three hundred and sixty five days periods yet during this final case a 12 months interval had elapsed. those workshops have confirmed themselves as a big occasion within the calendar for all people who find themselves drawn to growth within the underlying thought of refinement and within the take-up via of the equipment supported through that thought. one of many proposed issues of the 6th workshop used to be the reporting of profitable adoption in of rigorous software program improvement tools. The programme committee was once might be just a little disillusioned via the reaction from to the decision during this admire. even though, the hot interval should be characterized as considered one of consolidation, whilst these businesses that have made the choice that formal improvement equipment are very important to their enterprise were adopting them the place acceptable and discovering them to be helpful. at the different hand,. the tough financial system which exists in such a lot components of the built global might be now not the context during which businesses nonetheless doubtful in regards to the advantages are goil'\g to select making significant alterations of their operating practices.

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Additional resources for 6th Refinement Workshop: Proceedings of the 6th Refinement Workshop, organised by BCS-FACS, London, 5–7 January 1994

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Data transformations are handled in the same way). The TS is represented non graphically by T = (Ti II ... 11 Tn). Consequently, a micro configuration «Ti II .. ·11 Tn),f/, u) induces by convention micro configurations (Ti' fli, Ui) for the components Ti of Ti II ... 11 Tn, for i E {I, ... , n}. In the following we sketch the micro rule defining how the whole TS behaves if a transformation does a processing step. Micro rule 3 Define :F as the set of flows of T. Assume fl is the state of :F which meets 'v'XE(IIoUOlo) : fl(x) = file (x) and fl' is a state of :F, for which the formula RESULT(f/, fl', flD given above holds, which determines how the states fl, fl', f/~ depend on each other, taking the semantics of a composed flow into account.

E J, ~'K2l- - --i> '-; d Specifications : STD K 2 : STDKl: & a b,e e e d The only possible output to the outside world upon a value on flow a from the outside world are values on flows band d. Upon an input on flow a a state change of transformation Kl is caused, which results in a 25 concurrent output on flow hand c. Then the transformation K2, being in state Zl, reacts with an output on flow d. 2. Next we assume a Transformation Schema T2 composed of the Transformation Schema Tl and a control transformation K 3 , so that the flows hand e are no longer part of the interface with the outside world.

Zn) are used to distinguish the different kinds of directions of flows. Examples can be seen in the pictures of case 1,3 respectively 2,4 of the illustration of both formulas below. The set of possible values on a flow Z is called W z. Now we define the formulas Outll(J/, Ilk' II') and Inll(J/, Ilk' II') and illustrate them with pictures, as we sketched in example 7 above. 6 (Formula Outfl) For II, II' E FL(F) and Ilk E FL(I,. UOlc) let Outfl(J/, Ilk' II') be the formula ('rfzEo k : 1I'(z) = Ilk(z)) ('rfz,zl, ...

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