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A formal account of contracts for web services
 In WSFM, 3rd Int. Workshop on Web Services and Formal Methods, number 4184 in LNCS
, 2006
"... Abstract. We define a formal contract language along with subcontract and compliance relations. We then extrapolate contracts out of processes, that are a recursionfree fragment of ccs. We finally demonstrate that a client completes its interactions with a service provided the corresponding contrac ..."
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Cited by 25 (4 self)
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Abstract. We define a formal contract language along with subcontract and compliance relations. We then extrapolate contracts out of processes, that are a recursionfree fragment of ccs. We finally demonstrate that a client completes its interactions with a service provided the corresponding contracts comply. Our contract language may be used as a foundation of Web services technologies, such as wsdl and wscl. 1
ML^F  Raising ML to the Power of System F
 In ICFP ’03: Proceedings of the eighth ACM SIGPLAN international conference on Functional programming
, 2003
"... We propose a type system ML F that generalizes ML with firstclass polymorphism as in System F. We perform partial type reconstruction. As in ML and in opposition to System F, each typable expression admits a principal type, which can be inferred. Furthermore, all expressions of ML are welltyped, ..."
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Cited by 12 (0 self)
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We propose a type system ML F that generalizes ML with firstclass polymorphism as in System F. We perform partial type reconstruction. As in ML and in opposition to System F, each typable expression admits a principal type, which can be inferred. Furthermore, all expressions of ML are welltyped, with a possibly more general type than in ML, without any need for type annotation. Only arguments of functions that are used polymorphically must be annotated, which allows to type all expressions of System F as well.
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"... The quest for type inference with firstclasspolymorphic types Programming languages considerably benefit from static typechecking. In practice however, types may sometimes trammel programmers, for two opposite reasons. On the one hand, type annotations may quickly become a burden to write; while ..."
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The quest for type inference with firstclasspolymorphic types Programming languages considerably benefit from static typechecking. In practice however, types may sometimes trammel programmers, for two opposite reasons. On the one hand, type annotations may quickly become a burden to write; while they usefully serve as documentation for toplevel functions, they also obfuscatethe code when every local function must be decorated. On the other hand, since types are only approximations, any type system willreject programs that are perfectly wellbehaved and that could be accepted by another more expressive one; hence, sharp programmers may be irritated in such situations.
Foundations and Applications of HigherDimensional Directed Type Theory
"... Intuitionistic type theory [43] is an expressive formalism that unifies mathematics and computation. A central concept is the propositionsastypes principle, according to which propositions are interpreted as types, and proofs of a proposition are interpreted as programs of the associated type. Mat ..."
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Intuitionistic type theory [43] is an expressive formalism that unifies mathematics and computation. A central concept is the propositionsastypes principle, according to which propositions are interpreted as types, and proofs of a proposition are interpreted as programs of the associated type. Mathematical propositions are thereby to be understood as specifications, or problem descriptions, that are solved by providing a program that meets the specification. Conversely, a program can, by the same token, be understood as a proof of its type viewed as a proposition. Over the last quartercentury type theory has emerged as the central organizing principle of programming language research, through the identification of the informal concept of language features with type structure. Numerous benefits accrue from the identification of proofs and programs in type theory. First, it provides the foundation for integrating types and verification, the two most successful formal methods used to ensure the correctness of software. Second, it provides a language for the mechanization of mathematics in which proof checking is equivalent to type checking, and proof search is equivalent to writing a program to meet a specification.