Experimenting with Multi-Level Models in a Two-Level Modeling Tool

This paper discusses two ways to establish the connection between two levels in a multi-level model. The first approach uses normal associations and generalizations under the assumption that the multi levels are represented in one UML and OCL model. The second approach views a middle level model both as a type model and as an instance model and introduces operations to navigate between the type and instance level. The paper reports on some experiments that have been carried out.