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An applicative language called HOPE is described and discussed. The underlying goal of the design and implementation effort was to produce a very simple programming language which encourages the construction of clear and manipulable programs. HOPE does not include an assignment statement; this is felt to be an important simplification. The user may freely(More)
Casl is an expressive language for the formal specification of functional requirements and modular design of software. It has been designed by CoFI, the international Common Framework Initiative for algebraic specification and development. It is based on a critical selection of features that have already been explored in various contexts, including(More)
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We present the Mobile Resource Guarantees framework: a system for ensuring that downloaded programs are free from run-time violations of resource bounds. Certificates are attached to code in the form of efficiently checkable proofs of resource bounds; in contrast to cryptographic certificates of code origin, these are independent of trust networks. A novel(More)
The behavioural semantics of specifications with higher-order logical formulae as axioms is analyzed. A characterization of behavioural abstraction via behavioural satisfaction of formulae in which the equality symbol is interpreted as indistin-guishability, which is due to Reichel and was recently generalized to the case of first-order logic by Bidoit et(More)
The program development process is viewed as a sequence of implementation steps leading from a spe-ciication to a program. Based on an elementary notion of reenement, two notions of implementation are studied: constructor implementations which involve a construction \on top of" the implementing speciication, and abstractor implementations which additionally(More)
The properties of a simple and natural notion of observational equivalence of algebras and the corresponding specification-building operation are studied. We begin with a defmition of observational equivalence which is adequate to handle reachable algebras only, and show how to extend it to cope with unreachable algebras and also how it may be generalised(More)
Abatrect A kernel specification language called ASL is presented. ASL comprises five fundamental but powerful specification-building operations and has a simple semantics. Behavioural abstraction with respect to a set of observable sorts san be expressed, and (recurstve) parameterisad specifications can be defined using a more powerful and more expressive(More)