Co-located with
ICLP 2012 , Budapest, Hungary.

In its 2012 edition, CICLOPS was coordinated with WLPE. In particular, two special events were organised: (a) SWI-25, a celebration and retrospective of the open source SWI-Prolog engine on the occasion of its 25th birthday, and (b) OpenPL, an event on (1) coordinating libraries and add-on packages, and (2) the creation of a user-contributing repository of Prolog code

Important Dates

Submission deadline (extended): July 1, 2012
Notification of authors: July 20, 2012
Camera-ready copy due: July 31, 2012
Workshop dates: Tuesday September 4, 2012

Topics of interest

This workshop aimed at discussing and exchanging experience on the design, implementation, and optimization of logic, constraint (logic) programming systems, and other systems based on logic as a means of expressing computations. Experience backed up by real implementations and their evaluation was given preference, as well as descriptions of work in progress in that direction.

Topics included, but were not limited to:
  • Sequential implementation schemes (abstract machines, translation to other languages, etc.).
  • Implementation of concurrent and distributed logic and constraint programming systems.
  • Implementation of type inference and type checking systems for logic and constraint programming languages.
  • Compile-time analysis and its application to code generation.
  • Balance between compile-time effort and run-time machinery, dynamic compilation.
  • Interaction between high-level optimizations / transformations / specialization and low-level issues.
  • Memory management and garbage collection issues.
  • Indexing techniques and optimizations for large size programs.
  • Optimizations for program generated logic and constraint programs.
  • Implementation of logic engines in functional and object oriented languages.
  • Embedding of logic and constraint programming engines in multi-paradigm systems.
  • Implementation techniques for alternative logic engines and inference mechanisms (ASP, SAT, QSAT, DL etc.).
  • Implementation of theorem provers, proof assistants and logic based natural language processing systems.
  • Implementation of object and agent-oriented extensions to logic and constraint programming languages.
  • Object and module systems.
  • Design and implementation of declarative I/O concepts for logic and constraint programming languages.
  • Implementations and ports of logic and constraint programming systems for mobile phones and netbooks.
  • Documenting, debugging, testing, and profiling tools for logic and constraint programming systems.

Workshop Goals

Our intent was to bring together, in an informal setting, people involved in research on sequential and parallel implementation technologies for logic and constraint programming languages and systems, in order to promote the exchange of ideas and feedback on recent developments. The workshop has indeed provided a meeting point for people working on implementation technology for different aspects of logic and constraint-based languages and systems.


CICLOPS'12 continued a tradition of successful workshops on Implementations of Logic Programming Systems, previously held 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 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 in Paphos (2001), Copenhagen (2002), Mumbai (2003), Saint Malo (2004), Sitges (2005), Seattle (2006), Porto (2007), Udine (2008), Pasadena (2009), Edinburgh (2010) - together with WLPE, Lexington (2011).

Submission Information

Authors were invited to submit PDF files of papers written in English and not exceeding 15 pages using LNCS LaTeX format. Submissions were handled by the EasyChair system at the URL

Program Committee

Nicos Angelopoulos (Netherlands Cancer Institute, The Netherlands)
Roberto Bagnara (University of Parma and BUGSENG srl, Italy)
Miguel Calejo (Declarativa, Portugal)
Mats Carlsson (Swedish Institute of Computer Science, Sweden)
Daniel Diaz (University of Paris-I, France)
Rémy Haemmerlé (Technical University of Madrid, Spain)
Günter Kniesel (University of Bonn, Germany)
Paulo Moura (CRACS - INESC Porto and University of Beira Interior, Portugal)
Ricardo Rocha (University of Porto, Portugal)
Guido Tack (Monash University, Australia)
Paul Tarau (University of North Texas, USA)
Markus Triska (Vienna University of Technology, Austria)
Jan Wielemaker (University of Amsterdam, The Netherlands)
Neng-Fa Zhou (Brooklyn College, USA)

Workshop Coordinators

Nicos Angelopoulos (Netherlands Cancer Institute, The Netherlands)
Roberto Bagnara (University of Parma and BUGSENG srl, Italy)


The informal workshop proceedings are available on-line at the Computing Research Repository. An electronic copy was distributed during the conference.