Model Transformation in the Large

Current rule-based model transformation approaches as the Query/View/Transformation (QVT) standard or Triple Graph Grammars (TGGs) disregard means for structuring model transformation specifications. As a result large scale model transformation specifications are hard to understand and to maintain. Furthermore, these specifications cannot utilize reusing mechanisms which would reduce the size of the specifications and improve their readability. In this paper we discuss how to transfer means for structuring huge metamodels and models as provided by common modeling languages to the world of model transformation languages. We focus on generalization issues as well as on package dependencies. As a result we come up with an extension to our TGG approach that enables the user to specify structured bidirectional model transformations in a declarative way.