Type Systems for Bigraphs

Ebbe Elsborg; Thomas Hildebrandt; Davide Sangiorgi

Type Systems for Bigraphs

Ebbe Elsborg, Thomas Hildebrandt, Davide Sangiorgi

Abstract

We propose a novel and uniform approach to type systems for (process) calculi, which roughly pushes the challenge of designing type systems and proving properties about them to the meta-model of bigraphs. Concretely, we propose to define type systems for the term language for bigraphs, which is based on a fixed set of elementary bigraphs and operators on these. An essential elementary bigraph is an ion, to which a control can be attached modelling its kind (its ordered number of channels and whether it is a guard), e.g. an input prefix of pi-calculus. A model of a calculus is then a set of controls and a set of reaction rules, collectively a bigraphical reactive system (BRS). Possible advantages of developing bigraphical type systems include: a deeper understanding of a type system itself and its properties; transfer of the type systems to the concrete family of calculi that the BRS models; and the possibility of modularly adapting the type systems to extensions of the BRS (with new controls). As proof of concept we present a model of a pi-calculus, develop an i/o-type system with subtyping on this model, prove crucial properties (including subject reduction) for this type system, and transfer these properties to the (typed) pi-calculus.

Originalsprog	Engelsk

Udgivelsessted	Copenhagen
Forlag	IT-Universitetet i København
Antal sider	39
ISBN (Trykt)	978-87-7949-184-7
Status	Udgivet - 2008
Udgivet eksternt	Ja

Navn	I T University. Technical Report Series
Nummer	TR-2008-110

Citationsformater

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