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Auflistung nach Autor:in "Retschitzegger, Werner"

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  • Zeitschriftenartikel
    Ein UML-basiertes Framework zur Modellierung ubiquitärer Web-Anwendungen
    (Wirtschaftsinformatik: Vol. 44, No. 3, 2002) Hitz, Martin; Kappel, Gerti; Retschitzegger, Werner; Schwinger, Wieland
    Electronic commerce (e-commerce) and mobile commerce (m-commerce) have dramatically boosted the demand for services which enable ubiquitous access. Ubiquity offers opportunities in terms of time aware, location aware, device aware, and personalised services. Development of ubiquitous Web applications, however, turns out to be rather complex and thus requires appropriate methodological support. Existing methods for modelling Web applications only partially match the requirements resulting from their ubiquitous nature.This article aims at filling this gap by presenting a UML based framework for modelling ubiquitous Web applications, focussing on issues of adaptation modelling. It encompasses both, context modelling by providing a physical and a logical context model, and modelling the adaptation process per se. The latter is realised in terms of a rule model enabling monitoring of context changes and activation of corresponding adaptation operations. The separation of a Web application in a stable and context independent part on the one hand and a variable and context dependent part on the other hand supports reusability and locality of change.
  • Konferenzbeitrag
    On models and ontologies - A layered approach for model-based tool integration
    (Modellierung 2006, 2006) Kappel, Gerti; Kapsammer, Elisabeth; Kargl, Horst; Kramler, Gerhard; Reiter, Thomas; Retschitzegger, Werner; Schwinger, Wieland; Wimmer, Manuel
    The exchange of models among different modeling tools ever more becomes an important prerequisite for effective software development processes. Due to a lack of interoperability, however, it is often difficult to use tools in combination, thus the potential of model-driven software development cannot be fully exploited. This paper proposes ModelCVS, a system which enables tool integration through transparent transformation of models between different tools' modeling languages expressed as MOF-based metamodels. ModelCVS provides versioning capabilities exploiting the rich syntax and semantics of models. Concurrent development is enabled by storing and versioning software artifacts that clients can access by a check-in/check-out mechanism, similar to a traditional CVS server. Semantic technologies in terms of ontologies are used together with a knowledge base to store machine-readable, tool integration relevant information, thus allowing to minimize repetitive effort and partly automate the integration process.
  • Konferenzbeitrag
    Taking the pick out of the bunch - type-safe shrinking of metamodels
    (Software Engineering 2013, 2013) Bergmayr, Alexander; Wimmer, Manuel; Retschitzegger, Werner; Zdun, Uwe
    To focus only on those parts of a metamodel that are of interest for a specific task requires techniques to generate metamodel snippets. Current techniques generate strictly structure-preserving snippets, only, although restructuring would facilitate to generate less complex snippets. Therefore, we propose metamodel shrinking to enable type-safe restructuring of snippets that are generated from base metamodels. Our approach allows to shrink a selected set of metamodel elements by automatic reductions that guarantee type-safe results by design. Based on experiments with 12 different metamodels from various application domains, we demonstrate the benefits of metamodel shrinking supported by our prototypical implementation build on top of the Eclipse Modeling Framework (EMF).