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GIPSY is a platform providing a framework for the compilation and execution of programs written in intensional programming languages of the Lucid family. While maintaining its use of intensionality, over the years, Lucid constantly underwent changes in its syntax, and its semantics is getting more and more generalized. Throughout this hectic evolution of the language, various systems for the evaluation of Lucid programs were developed. Due to lack of ability to adapt to the syntax and semantic changes of the language, all of them met with doom as new evolutions of the language were proposed. Set in this evolutionary aspect of Lucid, GIPSY aims at easing the development of the Lucid family of intensional programming languages by providing a common system into which variants of Lucid can be compiled and executed and, more interestingly, developed in the future. One of the latest evolutions of Lucid is the language Lucx, permitting the explicit use of contexts as first-class atomic entities. This paper presents the integration of Lucx's context calculus into GIPSY. We define the notion of context according to Lucx, its syntax and semantics, as well as operators on such contexts. We then present how context entities have been abstracted into implementation classes and embedded into GIPSY.

This article is an overview of the GIPSY Demand Migration System (DMS). This system brings a DemandDriven Execution Engine like the one used in the GIPSY to a high level of distributiveness and interoperability of operational nodes, by mixing together advanced distributed technologies. The main Demand Migration System's artifacts are discussed, and their different distributions within the GIPSY are surveyed. The article concludes with a presentation of a successful GIPSY Demand Migration implementation, based on JINI. This paper describes only the aspects of the GIPSY Demand Migration, i.e. it does not deal with load balancing and efficiency aspects of the GIPSY, as these are to be tackled by other subsystems of the GIPSY.

We describe a type system for a platform called the General Intensional Programming System (GIPSY), designed to support intensional programming languages built upon intensional logic and their imperative counter-parts for the intensional execution model. In GIPSY, the type system glues the static and dynamic typing between intensional and imperative languages in its compiler and runtime environments to support the intensional evaluation of expressions written in various dialects of the intensional programming language Lucid. The intensionality makes expressions to explicitly take into the account a multidimensional context of evaluation with the context being a first-class value that serves a number of applications that need the notion of context to proceed. We describe and discuss the properties of such a type system as well as particularities of the design and implementation of it.

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