Jean-Marie Favre Dragan Gasevic Ralf Lämmel Andreas Winter 3rd International Workshop on Metamodels, Schemas, Grammars and Ontologies. 52-55 2006 conf/models/2006w MoDELS Workshops http://dx.doi.org/10.1007/978-3-540-69489-2_7 db/conf/models/models2006w.html#FavreGLW06