The last years have witnessed continuous progress in the technology available both for academic and commercial computing environments.  Examples include more processor performance, increased memory capacity and bandwidth, faster networking technology, and operating system support for cluster computing. These improvements, combined with recent advances in  compilation and implementation technologies, are causing high-level languages to be regarded as good candidates for programming complex, real world  applications. Techniques aiming at achieving flexibility in the language  design make powerful extensions easier to implement; on the other hand,  implementations which reach good performance in terms of speed and memory consumption make declarative languages and systems amenable to develop non-trivial applications.

Logic Programming and Constraint Programming, in particular, seem to offer one of the best options, as they couple a high level of abstraction and a declarative nature with an extreme flexibility in the design of their implementations and extensions and of their execution model. This adaptability is key to, for example, the implicit exploitation of alternative execution strategies tailored for different applications (e.g., for domain-specific languages) without unnecessarily jeopardizing efficiency.

This workshop continues a tradition of successful workshops on Implementations of Logic Programming Systems, previously held with in Budapest (1993) and Ithaca (1994), the Compulog Net workshops on Parallelism and Implementation Technologies held in Madrid (1993 and 1994), Utrecht (1995) and Bonn (1996), the Workshop on Parallelism and Implementation Technology for (Constraint) Logic Programming Languages (ParImp) held in Port Jefferson (1997), Manchester (1998), Las Cruces (1999), and London (2000), and more recently the Colloquium on Implementation of  Constraint and LOgic Programming Systems (CICLOPS) in Paphos (Cyprus, 2001), Copenhagen (2002), Mumbai (2003), Saint-Malo (France, 2004), and Sitges (Spain, 2005), and the CoLogNet Workshops on Implementation Technology for Computational Logic Systems held in Madrid (2002), Pisa (2003) and Saint-Malo (France, 2004).

The workshop aims at discussing and exchanging experience on the design,  implementation, and optimization of logic and constraint (logic) programming  systems, or systems intimately related to logic as a means to express computations. Preference will be given to the analysis and description of implemented (or under implementation) systems and their associated techniques, problems found in their development or design, and steps taken towards the solutions.   

The workshop topics include, but are not limited to:
  • Implementation of standard/alternative sequential models (generalization and modification of the WAM, translation to lower-level and/or general-purpose languages, etc.);
  • Implementation of parallel/concurrent models;
  • Interaction between high-level optimizations/transformations and lower-level issues;
  • Compile-time analysis and its application to code generation;
  • Balance between compile-time effort and run-time machinery;
  • Memory management, indexing, and garbage collection issues;
  • Profiling tools and performance evaluation;
  • Implementation techniques for declarative programming paradigms with basis on, or extending, logic and constraint programming, such as non-monotonic reasoning, inductive logic programming, natural language processing systems, etc;
  • Software desing with and for (C)LP systems: components, patterns, etc.;
  • Design and implementation of programming environments;
  • Experiences from using systems in real-life applications.
The workshop is co-located with the 22nd International Conference on Logic Programming.

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The program of the workshop can be found HERE.

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The proceedings of the workshop can be found HERE.

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  • AR (Action Rules): The Language, Implementation, and Applications (Invited Talk)
    Neng-Fa Zhou (CUNY Brooklyn College and Graduate Center)
  • H. Guo, M. Liu. Embedding Solution Preferences via Transformation
  • T. Soares, M. Ferreira, R. Rocha, N. Fonseca. On Applying Deductive Databases to Inductive Logic Programming: a Performance Study
  • R. Rocha. Efficient Support for Incomplete and Complete Tables in the YapTab Tabling System
  • B. Demoen, P-L. Nguyen. Delay and events in the TOAM and the WAM
  • Q. Phan, G. Janssens. Towards Region-based Memory Management for Mercury Programs
  • R. Troncon, B. Demoen, G. Janssens. When tabling does not work
  • P. Costa, R. Rocha, M. Ferreira. DBTAB: a Relational Storage Model for the YapTab Tabling System
  • L. Chrpa. Linear Logic: Foundations, Applications and Implementations
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Participants  should  submit a paper  (maximum 15 pages,  PDF format),  describing  their work  in topics  relevant  to the  workshop. Accepted papers  will be presented  during the workshop.   At least one author  of an accepted contribution  is expected to register for the workshop, and present the paper. All  submissions  should  include   the  author's  name(s), affiliation, complete mailing address, and email address.
Authors are requested to prepare their submissions, following the LNCS/LNAI Springer format. Please see:
for further details.

The submission  should be sent  through the electronic submission system:
The deadline for receipt of submissions is June 1, 2006. Papers received after this date may not be reviewed. Eligible  papers  will  be  peer-reviewed  by  at least two members of the Program Committee.
Authors will be notified via email of the results by July 1, 2006. Authors of accepted papers are expected  to improve their paper based on reviewers' comments and to send a camera ready version of their manuscripts by July 20, 2006.
Accepted papers will be included in the workshop proceedings, which will be distributed to the participants.
Questions about submissions may be directed to the workshop organizers.

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Important DatesIMPORTANT DATES  

The proposed schedule of important dates for the workshop is as follows:
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Workshop Organizers WORKSHOP ORGANIZERS  

Hai-Feng Guo 
Department of Computer Science
University of Nebraska at Omaha
6001 Dodge Street
Omaha, NE 68182, USA
Email: haifengguo <AT> mail <DOT> unomaha <DOT> edu 

Enrico Pontelli 
Department of Computer Science
New Mexico State University
Box 30001, MSC CS
Las Cruces, NM 88003, USA
Email: epontell <AT> cs <DOT> nmsu <DOT> edu 

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Program CommitteePROGRAM COMMITTEE  

Manuel Carro, Polytechnic University of Madrid, Spain

Bart Demoen, KUL Leuven, Belgium

Michel Ferreira, University of Porto, Portugal

Hai-Feng Guo, University of Nebraska at Omaha, USA

Gopal Gupta, University of Texas at Dallas, USA

Enrico Pontelli, New Mexico State University, USA

Vitor Santos Costa, Federal University of Rio de Janeiro, Brasil

Tom Schrijvers, KUL Leuven, Belgium

Christian Schulte, KTH Royal Institute of Technology, Sweden

Neng-Fa Zhou, City University of New York, USA

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