Publikationen zum Fachbereich Open Workflow Nets

Konferenzbeiträge und Beiträge auf Workshops

• Wil M. P. van der Aalst, Arjan J. Mooij, Christian Stahl, and Karsten Wolf. Service Interaction: Patterns, Formalization, and Analysis. In Marco Bernardo, Luca Padovani, and Gianluigi Zavattaro, editors, Formal Methods for Web Services (SFM 2009), volume 5569, pages 42--88, April 2009. Springer-Verlag.

  Abstract: As systems become more service oriented and processes increasingly cross organizational boundaries, interaction becomes more important. New technologies support the development of such systems. However, the paradigm shift towards service orientation, requires a fundamentally different way of looking at processes. This survey aims to provide some foundational notions related to service interaction. A set of service interaction patterns is given to illustrate the challenges in this domain. Moreover, key results are given for three of these challenges: (1) How to expose a service?, (2) How to replace and refine services?, and (3) How to generate service adapters? These challenges will be addressed in a Petri net setting. However, the results extend to other languages used in this domain.

  

• Niels Lohmann, Peter Massuthe, and Karsten Wolf. Operating Guidelines for Finite-State Services. In Jetty Kleijn and Alex Yakovlev, editors, 28th International Conference on Applications and Theory of Petri Nets and Other Models of Concurrency, ICATPN 2007, Siedlce, Poland, June 25-29, 2007, Proceedings, volume 4546 of Lecture Notes in Computer Science, pages 321-341, 2007. Springer-Verlag.

  Abstract: We study services modeled as open workflow nets (oWFN) and describe their behavior as service automata. Based on service automata, we introduce the concept of an operating guideline, extending the work of [1, 2] which was restricted to acyclic services. An operating guideline gives complete information about how to properly interact (in this paper: deadlock-freely and with limited communication) with an oWFN N. It can be executed thus forming a properly interacting partner of N, or it can be used to support service discovery. An operating guideline for N is a particular service automaton S that is enriched with Boolean annotations. S interacts properly with the service automaton Prov, representing the behavior of N , and is able to simulate every other service that interacts properly with Prov . The attached annotations give complete information about whether or not a simulated service interacts properly with Prov, too.

  

• Karsten Schmidt. Controllability of Open Workflow Nets. In Jörg Desel and Ulrich Frank, editors, Enterprise Modelling and Information Systems Architectures, volume P-75 of Lecture Notes in Informatics (LNI), Bonn, pages 236-249, 2005. Entwicklungsmethoden für Informationssysteme und deren Anwendung (EMISA, RWTH Aachen), Köllen Druck+Verlag GmbH.

Technische Berichte

• Christian Stahl, Peter Massuthe, and Jan Bretschneider. Deciding Substitutability of Services with Operating Guidelines. Informatik-Berichte 222, Humboldt-Universität zu Berlin, April 2008.

  Abstract: Deciding whether a service $S$ can be substituted by another service S' is an important problem in practice and one of the research challenges in service-oriented computing. In this paper, we define three substitutability notions for services. Accordance specifies that S' cooperates with at least the environments that S cooperates with. S and S' are equivalent if they cooperate with the same environments. To guarantee that S' cooperates with a fixed subset of environments that S cooperates with, the notion of deprecation can be used. For each substitutability notion we present a decision algorithm. To this end we apply the concept of an operating guideline of a service as an abstract representation of all environments the service cooperates with.

  

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