In object-oriented systems, object associations generally result in a complex structure whose precise description is a crucial part of the sys-tem's formal speciication. A particularly common object association arises when one object exclusively controls (owns) another. As exclusive object control is an important aspect of safety and security critical systems, speciic notation to capture direct...

The importance of use cases has been growing for the last few years. We believe they are important to help developers capturing requirements. The work presented here formalises use cases using basic temporal logic to define history invariants within Object-Z class schemas. This is accomplished by proposing a set of formal frameworks integrated within a process.

This paper describes an approach to transferring techniques of refactorings to formal methods. We use syntactical rewriting rules to express refactorings on Object-Z specifications. In contrast to programming languages here refactorings can be formally proven to preserve the behaviour of the specification. We give an outline of such a proof of behaviour preservation.

This paper specifies the formal semantics of XSLT. Using Object-Z specification language to describe each constructs of the language as objects, the stylesheet itself was specified by underlying objects. This work will contribute to the implementation of XSLT.

This paper describes a timed, multithreaded object modeling notation for specifying real-time, concurrent, and reactive systems. The notation Timed Communicating Object Z (TCOZ) builds on Object-Z's strengths in modeling complex data and algorithms, and on Timed CSP's strengths in modeling process control and real-time interactions. TCOZ is novel in that it includes timing primitives, properly ...

Object-ZZ2, 3, 4] is an extension of the formal speciication language ZZ5, 7, 8] to accommodate object orientationn6, 1]. The main reason for this extension is to improve the clarity of large speciications through enhanced structuring. A Z speciication typically deenes a number of state and operation schemas. A state schema groups together variables and deenes the relationship that holds betwee...