Download Semantics of Specification Languages (SoSL): Proceedings of by Stephen Brien (auth.), D. J. Andrews, J. F. Groote, C. A. PDF

By Stephen Brien (auth.), D. J. Andrews, J. F. Groote, C. A. Middelburg (eds.)

SoSL was once the 1st foreign Workshop on Semantics of Specification Languages, held from 25-27 October 1993 in Utrecht, the Netherlands. The workshop was once equipped through the dept of Philosophy of Utrecht collage with monetary aid from the Nationale Faciliteit Informatica of the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), and below the auspices of the British desktop Society'S professional staff in Formal features of Computing technology (BCS FACS). the worry of the workshop used to be the semantics of specification languages, and the problems heavily concerning this quarter, comparable to kind checking and the justification of evidence principles and facts responsibilities. Its goal was once the alternate of difficulties and ideas during this box of formal tools, and the identity of universal courses of labor for additional research. this system of SoSL consisted of three invited lectures featuring the advancements of the semantics of three significant specification languages. in addition, there have been sixteen shows of submitted papers. This quantity offers an instantaneous account of the workshop. It includes three papers that fit the invited lectures and the sixteen chosen papers. The editors are looking to thank all those that have contributed to the workshop; this system Committee and the referees for choosing the contributed papers, the invited audio system for his or her fascinating talks, the Organizing Committee for all their efforts, and naturally the individuals. we've the sensation that the workshop was once precious and may be repeated.

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Additional info for Semantics of Specification Languages (SoSL): Proceedings of the International Workshop on Semantics of Specification Languages, Utrecht, The Netherlands, 25 – 27 October 1993

Sample text

The rules also provide definitions of attributes (like new and free, which identify declared and used names) and transformations (like name substitutions). These are particularly important because the proof rules rely on renaming to achieve effects like those achieved by 'static' and 'dynamic' variables, channels and sorts in the semantics. 45 In fact several kinds of rule acting on constructs can be identified, and for any construct the rules are ordered according to this identification. ) The kinds of rules are as follows: - context free transformations into other constructs that do not change attribute values; - context free definitions of attribute values; - context free transformations into other constructs that change attribute values; - context free combinations with other constructs that change attribute values; - context dependent transformations into other constructs that change attribute values; - context dependent combinations with other constructs that change attribute values; - context dependent assertions about properties that constitute decidable formation rules; - context dependent assertions about properties that let meanings be inferred; - context dependent combinations with other constructs that let meanings be inferred.

Formalising the higher level of abstraction involves constructing the machinery employed in the semantic foundations document, so the argument seems to establish nothing. Incidentally, the semantic foundations document does indicate the value of abstraction (or, more precisely, implicit definition). It exploits implicit definition to shorten the semantics in two ways: - by using invariants on static semantic domains and assertions of the existence of static semantic values (in the semantic rules), in order to test implicitly that constructs are well formed; - by postulating the existence of dynamic semantic domains where they can 'reasonably' be assumed to exist without an explicit construction.

Write Unit, tail'_ : Unit --. write a Unit, tail_ : Unit --. write any Unit, make taiI"_, tail'_ and tail_ all denote (total) procedures that take parameters of type Unit and return results of type Unit; however, tail"_ must not write to, or read from, any variable, tail'_ may write to, or read from, the variable a, and taiI_ may write to, or read from, any variable declared in the object where the procedure is instantiated. Thus some or all of the variables in particular objects may be included in the access rights of procedure types.

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