CHAPTER 6 Developing Model-to-Model Transformations A model is often used as the source or target of a Model-to-Model Transformation (M2M). Within the Modeling project, the M2M project has two components to provide transforma- tion capabilities: Atlas Transformation Language (ATL) and Query/View/Transformation (QVT). This book does not cover ATL, but it is similar to QVT. QVT is actually a collec- tion of three transformation languages, but this book covers only the Operational Mapping Language (OML). The other languages of QVT are its Relations language and the Core lan- guage; the Relations language has just released its first build at Eclipse.