Il est probable que le nom d’Ésope a servi à regrouper toutes sortes de récits qui circulaient jusque-là de façon orale et qui présentaient des caractéristiques communes [ 18 ]. Set-Theoretic Types for Polymorphic Variants. Selon une hypothèse de M. The strengths of one category correspond to the weaknesses of the other. Au niveau du renforcement et de la reconnaissance des plates-formes: We illustrate the use of this calculus by encoding a large fragment of Jaql, including operations and iterators over JSON, embedded SQL expressions, and co-grouping, and show how the encoding directly yields a typing discipline for Jaql as it is, namely without the addition of any type definition or type annotation in the code.
|Système d’exploitation:||Windows, Mac, Android, iOS|
|Licence:||Usage Personnel Seulement|
Elle se place à Dans la grosse po Ces cookies sont nécessaires au fonctionnement optimal du site. Par un renforcement des capacités des plates-formes sur le plan du management des connaissances. Nombre de salariés permanents et occasionnels en ETP des entreprises appuyées. In this first part we define and study the explicitly-typed version of the calculus in which type instantiation is driven by explicit instantiation annotations. Nouveau lieu pour cette nouvelle édition:
Langages de programmation, edop d’execution, sécurité, mobilité, théorie des types, programmation orientée à objets, algèbres de processus, langages pour XML, services web. Semantic subtyping for non-strict languages. In this work I reexamine the result of that article in the light of recent advances in sub- typing theory and programming languages, taking a fresh look at this old issue.
Finally, I took advantage of this opportunity to describe some undocumented advanced techniques of type-systems implementation that are known only to few insiders that dug in the code of some compilers: The declarative presentation consists in adding two subsumption-like rules, one for each preorder, to the existing standard rules of the type system. This yields clearer, more intelligible, and streamlined definitions; it also shows a direct correlation between cast insertion and materialization that suggests a logical interpretation of the cast calculus, an essential component of gradual typing systems.
We relate corresponding declarative and algorithmic presentations by soundness and completeness results. As customary, the semantics of the various gradually-typed languages is given in terms of a compilation into cast calculi that use blame labels to pinpoint cast failures.
Rendez-vous à Esope – Cetim – Centre technique des industries mécaniques
To that end, we show how to define the operational semantics for casts in the presence of unions and intersections, which is an important and far-from-obvious result. We also show a direct correlation between the safety of a cast and the « polarity » of its blame label, allowing for a simpler formulation of the so-called blame safety property. BOLDR also allows the nesting of queries for different, databases of possibly different data models.
The framework detects the, boundaries of queries present in an application, translates them into an, intermediate representation together with the relevant language environment, rewrites them in order to avoid query avalanches and to make the most out of, database optimizations, and converts the results back to the application. We, also present experiments showing that the techniques we implemented are, applicable to real-world database applications, both in terms of successfully, handling different sorts of language-integrated queries, and in terms of, better performance.
Gradual Typing with Union and Intersection Types. In particular, we show how to lift the definition of the domain and result type of an esopp from non-gradual types to gradual ones and likewise for the subtyping relation. We also show that deciding subtyping for gradual types can be reduced in linear time to eslp subtyping for non-gradual types and that the same holds true for all subtyping-related decision problems that must be solved for type inference.
More generally, this work not only enriches gradual type systems with unions and intersections and with the type precision that arise from their use, but also proposes and advocates a new style of gradual types programming where union and intersection types are used by programmers to instruct the system to perform fewer dynamic checks.
Behavioral Types in Programming Languages. Foundations and Trends in Programming Languagesvol. Broch Johnsen and F. Set-Theoretic Types for Polymorphic Variants. In this work, we present an alternative formalization of polymorphic variants, 0210 on set-theoretic types and subtyping, that yields a cleaner and more streamlined system.
Our formalization is more expressive than the current one 20010 types more programs while preserving type safetyit can internalize some meta-theoretic properties, and it removes some pathological cases of the current implementation resulting in a more intuitive and, thus, predictable type system. More generally, this work shows how to add full-fledged union types to functional languages of the ML family that usually rely on the Hindley-Milner type system.
As an aside, our system also improves the theory of semantic subtyping, notably by proving completeness for the type reconstruction algorithm. A Core Calculus for XQuery 3. The strengths of one category correspond to the weaknesses of the other.
In this work, we propose to bridge the gap between two of these languages: We do it by extending CDuce so as it can be 2100 as a succinct core lambda-calculus that captures XQuery 3. The extensions we consider essentially allow CDuce to implement by pattern matching XPath-like navigation expressions and to precisely type them.
The encoding of XQuery 3.
Qui sommes nous ?
Polymorphic Functions with Set-Theoretic Types. Local Type Inference and Type Reconstruction. In the first part, presented in a companion paper, we defined and studied the syntax, semantics, and evaluation of the explicitly-typed version of the calculus, in which type instantiation is driven by explicit instantiation annotations. In this second part we present a local type inference system that allows the programmer to omit explicit instantiation annotations, and a type reconstruction system that allows the programmer to omit explicit type annotations.
The work presented in the two articles provides the theoretical foundations and technical machinery needed to design and implement higher-order polymorphic functional languages for semi-structured data. Syntax, Semantics, and Evaluation. In this first part we define and study the explicitly-typed version of the calculus in which type instantiation is driven by explicit instantiation annotations. In the second part, presented in a companion paper, we define a local type inference system that allows the programmer to omit explicit instantiation annotations, and a type reconstruction system that allows the programmer to omit explicit type annotations.
Esope Paris – Rendez-vous en
This calculus lets users define their own operators, capturing a wider range of data processing capabilities, whilst providing a typing precision so far typical only of primitive hard-coded operators. The type inference algorithm is based on semantic type checking, resulting in type infor- mation that is both precise, and flexible enough to handle structured and semistructured data.
We illustrate the use of this calculus by encoding a large fragment of Jaql, including operations and iterators over JSON, embedded SQL expressions, and co-grouping, and show how the encoding directly yields a typing discipline for Jaql as it is, namely without the addition of any type definition or type annotation in the code. In particular they contain a list of tasks that are responsibility of the Program Committee PC chair before, during, and after the selection, as well as a description of the six-phases organization I used for selection.
Optimizing XML querying using type-based document projection. In this article, we propose a new approach, based on types, that greatly improves current solutions. A side contribution is a new type system for XPath able to handle backward axes. The soundness of our approach is formally proved.
Furthermore, we prove that the approach is also complete i. We further validate our approach using the XMark and XPathMark benchmarks and show that pruning not only improves the main memory query engine’s performances as expected but also those of state of the art native XML databases. Plan du site Ce site a été généré par deux programmes CDuce: Plus de details ici.
Ce site a été généré par deux programmes CDuce: