A Calculus of Global Interaction based on Session Types

This paper proposes a calculus for describing communication-centred programming and discusses its application to use cases from real business protocols. The formalism, called global calculus, aims at representing global message flows as structured communications. The global calculus originates from the Choreography Description Language (CDL), a web service description language developed by W3C’s WS-CDL Working Group. Its type discipline is based on the session types which have been studied over long years in the context of the π-calculus [9,6,18,4]. Session types offer a high-level abstraction and articulation for complex communication behaviours, and play a fundamental role to guide the programmer towards a correct implementation of business protocols.