Checking UML and OCL Model Consistency: An Experience Report on a Middle-Sized Case Study

This contribution reports on a middle-sized case study in which the consistency of a UML and OCL class model is checked. The class model restrictions are expressed by UML multiplicity constraints and explicit, non-trivial OCL invariants. Our approach automatically constructs a valid system state that shows that the model can be instantiated and thus proves consistency, i.e., shows that the invariants together with the multiplicity constraints are not contradictory.