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Abstract

The UML standard specifies well-formedness rules as constraints on UML models. To be correct, refactoring of a model must take these constraints into account and check that they are still satisfied after a refactoring has been performed — if not, the refactoring must be refused. With constraint-based refactoring, constraint checking is replaced by constraint solving, lifting the role of constraints from permitting or denying a tentative refactoring to computing additional model changes required for the refactoring to be executable. Thus, to the degree that the semantics of a modelling language is specified using constraints, refactorings based on these constraints are guaranteed to be meaning preserving. To enable the reuse of pre-existing constraints for refactoring, we present a mapping from well-formedness rules as provided by the UML standard to constraint rules as required by constraint-based refactoring. Using these mappings, models can be refactored at no extra cost; if refactorings fail, the lack of meaning preservation points us to how the constraint-based semantic specifications of the modelling language can be improved.

Keywords

Modelling Language Constraint Satisfaction Problem Sequence Diagram Constraint Solver Constraint Variable 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Friedrich Steimann
    • 1
  1. 1.Lehrgebiet ProgrammiersystemeFernuniversität in HagenHagenGermany

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