Abstract and concrete categories
Abstract and concrete categories
Schema equivalence in heterogeneous systems: bridging theory and practice
Information Systems - Special issue on extending database technology
Patterns of Enterprise Application Architecture
Patterns of Enterprise Application Architecture
A Transparent Schema-Evolution System Based on Object-Oriented View Technology
IEEE Transactions on Knowledge and Data Engineering
UML Distilled: A Brief Guide to the Standard Object Modeling Language
UML Distilled: A Brief Guide to the Standard Object Modeling Language
VLHCC '05 Proceedings of the 2005 IEEE Symposium on Visual Languages and Human-Centric Computing
Fundamentals of Algebraic Graph Transformation
Fundamentals of Algebraic Graph Transformation
Defining object-oriented execution semantics using graph transformations
FMOODS'06 Proceedings of the 8th IFIP WG 6.1 international conference on Formal Methods for Open Object-Based Distributed Systems
Refactoring information systems: association folding and unfolding
ACM SIGSOFT Software Engineering Notes
Model transformation and induced instance migration: a universal framework
SBMF'11 Proceedings of the 14th Brazilian conference on Formal Methods: foundations and Applications
A metamodelling approach to behavioural modelling
Proceedings of the Fourth Workshop on Behaviour Modelling - Foundations and Applications
Composition of model transformations: a categorical framework
SBMF'12 Proceedings of the 15th Brazilian conference on Formal Methods: foundations and applications
Co-transformation of graphs and type graphs with application to model co-evolution
ICGT'12 Proceedings of the 6th international conference on Graph Transformations
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Refactoring of information systems is hard, for two reasons. On the one hand, large databases exist which have to be adjusted. On the other hand, many programs access those data. Data and programs all have to be migrated in a consistent manner such that their semantics does not change. This paper addresses the data part of the problem and introduces a model for object-oriented structures, describing the schema level with classes, associations, and inheritance as well as the instance level with objects and links. Positive Horn formulas based on predicates are used to formulate constraints to be obeyed by the schema and instance level, in order to reflect object-oriented structures. Homomorphisms are used for the typing of the instance level as well as for the description of refactorings which specify the addition, folding, and unfolding of schema elements. A categorial framework is presented which allows us to derive instance migrations from schema transformations in such a way that instances of the old schema are automatically migrated into instances of the new schema. The natural use of the pullback functor for unfolding is followed by an initial semantics approach: Instance migration is completed with the help of a co-adjoint functor on arrow categories.