in recent years, formal methods have been used as an important tool for performance evaluation and verification of a wide range of systems. in the view points of engineers and practitioners, however, there are still some major difficulties in using formal methods. in this paper, we introduce a new formal modeling language to fill the gaps between object-oriented programming languages (oopls) us...

in recent years, formal methods have been used as an important tool forperformance evaluation and verification of a wide range of systems. in the viewpoints of engineers and practitioners, however, there are still some major difficultiesin using formal methods. in this paper, we introduce a new formal modelinglanguage to fill the gaps between object-oriented programming languages (oopls)used by...

In recent years, formal methods have been used as an important tool for performance evaluation and verification of a wide range of systems. In the view points of engineers and practitioners, however, there are still some major difficulties in using formal methods. In this paper, we introduce a new formal modeling language to fill the gaps between object-oriented programming languages (OOPLs) us...

In recent years, formal methods have been used as an important tool for performance evaluation and verification of a wide range of systems. In the view points of engineers and practitioners, however, there are still some major difficulties in using formal methods. In this paper, we introduce a new formal modeling language to fill the gaps between object-oriented programming languages (OOPLs) us...

To define the formal semantics of a modeling language, one normally starts from the abstract syntax and then defines the static semantics and dynamic semantics. Having a formal semantics is important for reasoning about the language but also for building tools for the language. In this paper we propose a novel approach for this task based on the Alloy language. With the help of a concrete examp...

The Use Case construct is one of the most important constructs for modelling the dynamics of a system. In this paper we describe the Use Case construct of the Unified Modeling Language (UML) together with two important kinds of relationships between Use Cases, namely Uses and Extends. These two relationships are specializations of the Generalization relationship in UML. We give a detailed prese...

Formal modelling languages are powerful tools to systematically represent and analyze the properties of systems. A myriad of new modelling languages, as well as extensions of existing ones, are proposed every year. We may consider that a modelling language is useful if it allows to represent the critical aspects of systems in an expressive way. In particular, we require that the modelling langu...

The Unified Modeling Language (UML) is the industry standard for modeling. With its recent advancement to version 2.0, there have been large amounts of changes and additions. In this paper I study some new features with a view to formal specification and verification, in particular the operators neg and assert, and notions of refinement based upon them.