An Institutional Framework for Heterogeneous Formal Development in UML

We present a framework for formal software development with UML. In contrast to previous approaches that equip UML with a formal semantics, we follow an institution based heterogeneous approach. This can express suitable formal semantics of the different UML diagram types directly, without the need to map everything to one specific formalism (let it be first-order logic or graph grammars). We show how different aspects of the formal development process can be coherently formalised, ranging from requirements over design and Hoare-style conditions on code to the implementation itself. The framework can be used to verify consistency of different UML diagrams both horizontally (e.g., consistency among various requirements) as well as vertically (e.g., correctness of design or implementation w.r.t. the requirements)

A thread-tag based semantics for sequence diagrams

The sequence diagram is one of the most popular behaviour modelling languages which offers an intuitive and visual way of describing expected behaviour of object-oriented software. Much research work has investigated ways of providing a formal semantics for sequence diagrams. However, these proposed semantics may not properly interpret sequence diagrams when lifelines do not correspond to threads of controls. In this paper, we address this problem and propose a thread-tag based sequence diagram as a solution. A formal, partially ordered multiset based semantics for the thread-tag based sequence diagrams is proposed

Interaction signatures and action templates in the ODP computational viewpoint

International audienceIn this work we raise two issues that we came across when aiming to formalize both interaction signatures and action templates within the ODP computational viewpoint. We discuss these two concepts and present a way to formalize them by introducing a new term to formal descriptions of interaction signatures. In the same spirit as other works, our aim is to address issues concerning how concepts of the ODP computational viewpoint are currently defined as we present some solutions to their formalisation. If required, our work aim to serve as a step to help improve or change the current process of formalizing the ODP computational viewpoint concepts using the UML language

Proceedings of International Workshop "Global Computing: Programming Environments, Languages, Security and Analysis of Systems"

According to the IST/ FET proactive initiative on GLOBAL COMPUTING, the goal is to obtain techniques (models, frameworks, methods, algorithms) for constructing systems that are flexible, dependable, secure, robust and efficient. The dominant concerns are not those of representing and manipulating data efficiently but rather those of handling the co-ordination and interaction, security, reliability, robustness, failure modes, and control of risk of the entities in the system and the overall design, description and performance of the system itself. Completely different paradigms of computer science may have to be developed to tackle these issues effectively. The research should concentrate on systems having the following characteristics: • The systems are composed of autonomous computational entities where activity is not centrally controlled, either because global control is impossible or impractical, or because the entities are created or controlled by different owners. • The computational entities are mobile, due to the movement of the physical platforms or by movement of the entity from one platform to another. • The configuration varies over time. For instance, the system is open to the introduction of new computational entities and likewise their deletion. The behaviour of the entities may vary over time. • The systems operate with incomplete information about the environment. For instance, information becomes rapidly out of date and mobility requires information about the environment to be discovered. The ultimate goal of the research action is to provide a solid scientific foundation for the design of such systems, and to lay the groundwork for achieving effective principles for building and analysing such systems. This workshop covers the aspects related to languages and programming environments as well as analysis of systems and resources involving 9 projects (AGILE , DART, DEGAS , MIKADO, MRG, MYTHS, PEPITO, PROFUNDIS, SECURE) out of the 13 founded under the initiative. After an year from the start of the projects, the goal of the workshop is to fix the state of the art on the topics covered by the two clusters related to programming environments and analysis of systems as well as to devise strategies and new ideas to profitably continue the research effort towards the overall objective of the initiative. We acknowledge the Dipartimento di Informatica and Tlc of the University of Trento, the Comune di Rovereto, the project DEGAS for partially funding the event and the Events and Meetings Office of the University of Trento for the valuable collaboration

Second ECOOP Workshop on Precise Behavioral Semantics (with an Emphasis on OO Business Specifications)

Business specifications are essential to describe and understand businesses (and, in particular, business rules) independently of any computing systems used for their possible automation. They have to express this understanding in a clear, precise, and explicit way, in order to act as a common ground between business domain experts and software developers. They also provide the basis for reuse of concepts and constructs ("patterns") common to all - from finance to telecommunications -, or a large number of, businesses, and in doing so save intellectual effort, time and money. Moreover, these patterns substantially ease the elicitation and validation of business specifications during walkthroughs with business customers, and support separation of concerns using viewpoints.Comment: 21 pages, 0 figure

On formalising and analysing the tweetchain protocol

Distributed Ledger Technology is demonstrating its capability to provide flexible frameworks for information assurance capable of resisting to byzantine failures and multiple target attacks. The availability of development frameworks allows the definition of many applications using such a technology. On the contrary, the verification of such applications are far from being easy since testing is not enough to guarantee the absence of security problems. The paper describes an experience in the modelling and security analysis of one of these applications by means of formal methods: in particular, we consider the Tweetchain protocol as a case study and we use the Tamarin Prover tool, which supports the modelling of a protocol as a multiset rewriting system and its analysis with respect to temporal first-order properties. With the aim of making the modeling and verification process reproducible and independent of the specific protocol, we present a general structure of the Tamarin Prover model and of the properties to verified. Finally, we discuss the strengths and limitations of the Tamarin Prover approach considering three aspects: modelling, analysis and the verification process. Copyrigh

Performance modelling for system-level design

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