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检索条件"任意字段=4th Fuji International Symposium on Functional and Logic Programming, FLOPS 1999"

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4th fuji international symposium on functional and logic programming, flops 1999

4th Fuji International Symposium on Functional and Logic Pro...

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4th fuji international symposium on functional and logic programming, flops 1999

ISBN: (纸本)354066677X

the proceedings contain 23 papers. the special focus in this conference is on functional and logic programming. the topics include: Semantics and types in functional logic programming;type inference for overloading without restrictions, declarations or annotations;partial evaluation and non-interference for object calculi;lazy lexing is fast;a functional-logic perspective of parsing;implementing encapsulated search for a lazy functional logic language;comparison of deforestation techniques for functional programs and for tree transducers;automatic verification based on abstract interpretation;a transformation system for lazy functional logic programs;termination analysis of tabled logic programs using mode and type information;on quasi-reductive and quasi-simplifying deterministic conditional rewrite systems;an interval lattice-based constraint solving framework for lattices;higher order matching for program transformation;automated generalisation of function definitions;an extensional characterization of lambda-lifting and lambda-dropping;using types as approximations for type checking prolog programs;a space efficient engine for subsumption-based tabled evaluation of logic programs.

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Structural abstraction and application in logic programming 6th

Structural abstraction and application in logic programming

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6th fuji international symposium on functional and logic programming, flops 2002

作者： Porto, António Departamento de Informática Universidade Nova de Lisboa Portugal

ISBN: (纸本)3540442332

this paper explores a seeminglyv ery simple idea—an operation for extending a term with extra (start or end) arguments to yield a new term. this allows the definition a varietyof structural operators that provide the power of functional composition and higher-order features on top of the non-directional and non-deterministic (relational) behavior of the underlying logic programming setting. Syntax alone is taken to be meaningless, semantics being associated to syntax in context. Multiple semantic views of each term are therefore possible, in different contexts. One such semantic view is structural, wherebya ny term is taken as an implicit abstraction of another term over some of its subterms. the standard operational semantics is extended with a rewrite step prior to each goal invocation, that appeals to a functional rewrite semantics to interpret certain terms as applications of implicit inner structural abstractions to inner arguments. the approach is first described through meta-level functional definitions, and then an implementation is shown through a collection of standard Prolog predicates. the powerful gain in expressiveness is thus achieved without anye xtension of the underlying machinery, much in the spirit of an old claim by D. H. Warren [5]. the scheme was motivated byt he needs of a large real-world application [4] where it is now in use. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Semantics

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Semantics and types in functional logic programming 4th

Semantics and types in functional logic programming

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4th fuji international symposium on functional and logic programming (flops 99)

作者： González-Moreno, JC Hortalá-González, MT Rodríguez-Artalejo, M UCM Dipartimento Sistemas Informat & Programac Madrid Spain

ISBN: (纸本)354066677X

the rewriting logic CRWL has been proposed as a semantic framework for higher-order functional logic programming, using applicative rewriting systems as programs and lazy narrowing as the goal solving procedure. We present an extension of CRWL with a polymorphic type system, and we investigate the consequences of type discipline both at the semantic level and at the operational level. Semantically, models must be extended to incorporate a type universe. Operationally, lazy narrowing must maintain suitable type information in goals, in order to guarantee well-typed computed answers.

关键词： Semantics

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A semantics for program analysis in narrowing-based functional logic languages 4th

A semantics for program analysis in narrowing-based function...

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4th fuji international symposium on functional and logic programming (flops 99)

作者： Hanus, M Lucas, S Rhein Westfal TH Aachen D-52056 Aachen Germany Univ Politecn Valencia DSIC E-46022 Valencia Spain

ISBN: (纸本)354066677X

We introduce a denotational characterization of narrowing, the computational engine of many functional logic languages. We use a functional domain for giving a denotation to the narrowing space associated to a given initial expression under an arbitrary narrowing strategy. Such a semantic description highlights (and favours) the operational notion of evaluation instead of the more usual model-theoretic notion of interpretation as the basis for the semantic description. the motivation is to obtain an abstract semantics which encodes information about the real operational framework used by a given (narrowing-based) functional logic language. Our aim is to provide a general, suitable, and accurate framework for the analysis of functional logic programs.

关键词： domain theory functional logic languages narrowing program analysis semantics

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Typed higher-order narrowing without higher-order strategies 4th

Typed higher-order narrowing without higher-order strategies

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4th fuji international symposium on functional and logic programming (flops 99)

作者： Antoy, S Tolmach, A Portland State Univ Dept Comp Sci Portland OR 97207 USA

ISBN: (纸本)354066677X

We describe a new approach to higher-order narrowing computations in a class of systems suitable for functional logic programming. Our approach is based on a translation of these systems into ordinary (first-order) rewrite systems and the subsequent application of conventional narrowing strategies. Our translation is an adaptation to narrowing of Warren's translation, but unlike similar previous work, we preserve static type information, which has a dramatic effect on the size of the narrowing space. Our approach supports sound, complete, and efficient higher-order narrowing computations in classes of systems larger than those previously proposed.

关键词： logic programming

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Implementing encapsulated search for a lazy functional logic language 4th

Implementing encapsulated search for a lazy functional logic...

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4th fuji international symposium on functional and logic programming (flops 99)

作者： Lux, W Univ Munster D-4400 Munster Germany

ISBN: (纸本)354066677X

A distinguishing feature of logic and functional logic languages is their ability to perform computations with partial data and to search for solutions of a goal. Having a built-in search strategy is convenient but not always sufficient. For many practical applications the built-in search strategy (usually depth-first search via global backtracking) is not well suited. Also the non-deterministic instantiation of unbound logic variables conflicts with the monadic I/O concept, which requires a single-threaded use of the world. A solution to these problems is to encapsulate search via a primitive operator try, which returns all possible solutions to a search goal in a list. In the present paper we develop an abstract machine that aims at an efficient implementation of encapsulated search in a lazy functional logic language.

关键词： Computer circuits

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A transformation system for lazy functional logic programs 4th

A transformation system for lazy functional logic programs

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4th fuji international symposium on functional and logic programming (flops 99)

作者： Alpuente, M Falaschi, M Moreno, G Vidal, G Univ Politecn Valencia DSIC Valencia 46022 Spain Univ Udine Dipartimento Matemat & Informat I-33100 Udine Italy UCLM Dept Informat Albacete 02071 Spain

ISBN: (纸本)354066677X

Needed narrowing is a complete operational principle for modern declarative languages which integrate the best features of (lazy) functional and logic programming. We define a transformation methodology for functional logic programs based on needed narrowing. We provide (strong) correctness results for the transformation system w.r.t. the set of computed values and answer substitutions and show that the prominent properties of needed narrowing -namely, the optimality w.r.t. the length of derivations and the number of computed solutions- carry over to the transformation process and the transformed programs. We illustrate the power of the system by taking on in our setting two well-known transformation strategies (composition and tupling). We also provide an implementation of the transformation system which, by means of some experimental results, highlights the benefits of our approach.

关键词： logic programming

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A functional-logic perspective of parsing 4th

A functional-logic perspective of parsing

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4th fuji international symposium on functional and logic programming, flops 1999

作者： Caballero, Rafael López-Fraguas, Francisco J. Departamento de Sistemas Informáticos y Programación Universidad Complutense de Madrid Madrid Spain

ISBN: (纸本)354066677X

Parsing has been a traditional workbench for showing the virtues of declarative programming. Both logic and functional programming claim the ability of writing parsers in a natural and concise *** address here the task from a functional-logic perspective. By modeling parsers as non-deterministic functions we achieve a very natural manner of building parsers, which combines the nicest properties of the functional and logic approaches. In particular, we are able to define parsers within our framework in a style very close to that of functional programming parsers, but using simpler concepts. Moreover, we have moved beyond usual declarative approaches to parsers, since the functional-logic parsers presented here can be considered as truly data values. As an example of this feature we define a function that detects ambiguous grammars. © Springer-Verlag Berlin Heidelberg 1999.

关键词： functional programming

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Termination analysis of tabled logic programs using mode and type information 4th

Termination analysis of tabled logic programs using mode and...

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4th fuji international symposium on functional and logic programming (flops 99)

作者： Verbaeten, S De Schreye, D Katholieke Univ Leuven Dept Comp Sci Louvain Belgium

ISBN: (纸本)354066677X

Tabled logic programming is receiving increasing attention in the logic programming community. It avoids many of the shortcomings of SLD(NF) execution and provides a more flexible and efficient execution mechanism for logic programs. In particular, tabled execution of logic programs terminates more often than execution based on SLD-resolution. One of the few approaches studying termination of tabled logic programs was developed by Decorte et al. they present necessary and sufficient conditions for two notions of universal termination under SLG-resolution, the resolution principle of tabling: quasi-termination and (the stronger notion of) LG-termination. Starting from these necessary and sufficient conditions, we introduce sufficient conditions which are stated fully at the clause level and axe easy to automatize. To this end, we use mode and type information: we consider simply moded, well-typed programs and queries. We point out how our termination conditions can be automatized, by extending the recently developed constraint-based automatic termination analysis for SLD-resolution by Decorte and De Schreye.

关键词： logic programming

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A space efficient engine for subsumption-based tabled evaluation of logic programs 4th

A space efficient engine for subsumption-based tabled evalua...

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4th fuji international symposium on functional and logic programming, flops 1999

作者： Johnson, Ernie Ramakrishnan, C.R. Ramakrishnan, I.V. Rao, Prasad Department of Computer Science State University of New York at Stony Brook Stony BrookNY11794-4400 United States

ISBN: (纸本)354066677X

Tabled resolution improves efficiency as well as termination properties of logic programs by sharing answer computations across "similar" subgoals. Similarity based on subsumption of subgoals rather than variance (i.e., identity modulo variable renaming) promotes more aggressive sharing, but requires mechanisms to index answers from dynamically growing sets. Earlier we proposed Dynamic threaded Sequential Automata (DTSA) as the data structure for organizing answer tables in subsumption-based tabling. Using a DTSA, we can retrieve answers one at a time from the table, strictly in the order of their insertion. Although DTSA performed very well, its space usage was high. Here we present an alternative data structure called Time-Stamped Trie (TST) that relaxes the retrieval order, and yet ensures that all answers will be eventually retrieved. We show that TST has superior space performance to DTSA in theory as well as practice, without sacrificing time performance. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Data structures

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