Model-Driven Engineering (MDE) encourages the use of graphical modeling tools, which facilitate the development process from modeling to coding. Such tools can be designed using the MDE approach into meta-modeling environments called metaCASE tools. It turned out that current metaCASE tools still require, in most cases, manual programming to build full tool support for the modeling language, especially for users' native methodologies and representational elements and propose limited possibilities in terms of reusability. In this context, we propose MID, a set of meta-models supporting the easy speci cation of modeling editors by means of reusable components and explain how representational meta-modeling is carried out with it.