By Mike P. Papazoglou (auth.), Zohra Bellahsène, Michel Léonard (eds.)
This publication constitutes the refereed complaints of the twentieth foreign convention on complex details structures Engineering, CAiSE 2008, held in Montpellier, France, in June 2008.
The 35 revised complete papers and nine revised brief papers awarded including 1 keynote lecture have been rigorously reviewed and chosen from 273 submissions. The papers are equipped in topical sections on duality and approach modelling, interoperability of IS and firms, refactoring, info platforms in e-government and life-science, wisdom styles for IS engineering, requisites engineering for IS, conceptual schema modelling, carrier infrastructure, provider evolution, versatile details applied sciences, metrics and procedure modelling, info method engineering, and IS improvement with ubiquitous technologies.
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Extra info for Advanced Information Systems Engineering: 20th International Conference, CAiSE 2008 Montpellier, France, June 16-20, 2008 Proceedings
We denote the sub-domain transformed by transition t as Dt, and its set of state variables is Xt. Necessary condition 2: ∀t∈T, pj∈•t, pk∈t•, it must be that Xt⊆∪jXpj; Xt∩Xpk ≠∅. In other words, for every transition, the state variables of the sub-domain in which the transition occurs, should: (a) be a subset of the state variables of all sub-domains represented by the input places (leading to it), and (b) include some state variable of every sub-domain represented by places preceding it. For example: assume the transition represents manufacturing a product.
To avoid the second case, the modeler needs to make sure that if two sub-domains that have alternative distinct D-paths need to synchronize, then every possible combination of these D-paths has a merging transition defined for it. To illustrate the idea, consider the examples of Fig. 4. In Fig. 4(a), the process domain is split in t1 to two concurrently active subdomains, and both these sub-domains have different D-paths that can be selected. The process may clearly deadlock, if one sub-domain takes a D-path leading to p7 while the other reaches p10, or if one sub-domain reaches p8 while the other takes a D-path that leads to p9.
The sub-domain on the right 28 P. Soffer, M. Kaner, and Y. Wand Fig. 4. D-path combinations side has four distinct D-paths: (1)p3→p4→p6→p9, (2) p3→p4→p6→p10, (3) p3→p5→p6→p9, and (4) p3→p5→p6→p10. To eliminate the possible deadlock, we need to define action in every possible situation the process may reach. We may look for a place which is reached from all D-paths. Considering the right side sub-domain, p6 is reachable in all the distinct D-paths. Hence, it is guaranteed to be reached. Let us examine a possible correction, where p6 is connected to t11.