Validation of UML Class Diagram and OCL pre-and post-conditions using OTS/CafeOBJ proof scores

Abstract

Unified Modeling Language (UML) and Object Constraint Language (OCL) are the most commonly used languages to model software systems. OCL is a formal language used to specify invariants as well as pre- and post-conditions on UML diagrams. However, there is no meaner to verify the satisfaction of the OCL constraints properties by the modeled system. This paper presents a formal approach to reason about UML Class Diagram (CD) and OCL “pre-” and “post-conditions” described on CD operations (or methods) using Observational Transition Systems in CafeOBJ (OTS/CafeOBJ) and proof scores of CafeOBJ. CafeOBJ is an executable formal algebraic specification language widely used to specify models for varieties of software and systems and verifying properties of them.