prototyping, role modeling. Model-Driven Engineering (MDE) advocates the generation of software applications from models, which are views on certain aspects of the software. We focus on a particular setup which consists of a graphical data modeling view and a view on an object-oriented implementation. In our Round-Trip Engineering (RTE) tool SelfSync , , the entities of the data modeling view and the corresponding implementation objects are one and the same resulting in a continuous, highly dynamic synchronization between the two views. SelfSync is the first prototype-based 1 RTE environment as it successfully combines prototypes and Extended Entity-Relationship (EER)  diagrams. This environment is built on top of the object-oriented prototype-based language Sel
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