[Apologies for multiple receptions]

Hello. This is a mail just for informing that the new release

Datalog Educational System version 1.5.0 http://des.sourceforge.net

has been launched on 30th, December, 2007 and ported to

Ciao Prolog 1.10p5

Release notes are attached to the end of this message. Please, see http://des.sourceforge.net for details.

Best regards.

Fernando Sáenz Pérez Profesor Titular de Universidad / Associate Professor Home Page: http://www.fdi.ucm.es/profesor/fernan Tel: + 34 913947642. Fax: + 34 913947547 Despacho / Office: 435 (4ª planta / 4th floor) Dept. Ingeniería del Software e Inteligencia Artificial / Department of Software Engineering and Artificial Intelligence Universidad Complutense de Madrid Facultad de Informática C/Profesor José García Santesmases, s/n E - 28040 Madrid. Spain

Version 1.5.0 of DES adds to previous version (1.4.0):

Enhancements: o A more fine-grained debugging as long as individual clauses can be inspected o Warning and error messages provided for: * Undefined predicates which are called by rules each time the database is changed * Unsafe rules * Execution exceptions known at compile-time o Exception messages provided for: * Execution exceptions unknown at compile-time o Rule transformation for allowing computation of safe rules which may raise run-time exceptions due to built-ins o Rejection of unsafe or uncomputable queries, views and autoviews o Catching of instantiation errors o Rule source annotated for debugging and informative errors, i.e., file and lines in the program (if consulted) or assertion time (if manually asserted) o Elapsed time display o New basic, simpler (although less efficient than the already implemented) algorithm for computing stratified negation, following [SD91] o Fresh variables are given new variable names instead of numbers o New commands: * /negation Displays the selected algorithm for solving negation * /negation Algorithm Sets the required Algorithm for solving negation (strata or et_not) * /timing Displays whether elapsed time display is enabled * /timing Switch Enables or disables elapsed time display (on or off, resp.) * /safe Displays whether program transformation is enabled * /safe Switch Enables or disables program transformation (on or off, resp.) o Changed commands: * /verbose Displays whether verbose output is enabled * /verbose Switch Enables or disables verbose output messages (on or off, resp.) o Deprecated commands: * /noverbose o Slight modifications on existing commands: * /debug Goal Level The inspection level can be set with the second optional argument with p for predicate level and c for clause level * /status Now, it also displays the selected algorithm for negation and whether program transformation is enabled * /version For matching the "standard" display o New examples added to the directory examples o The Prolog database corresponding to the Datalog loaded programs has been discarded, therefore using only one representation for them o Revised and upgraded user's manual

Changes: o Inequality built-ins cause an error and stops execution whenever they are computed with any non-ground argument (formerly, they silently failed)

Fixed bugs: o The Linux version did not work. Now, it has been fixed and tested on Ubuntu 6.10, Kubuntu 7.04 (Feisty), and Mandriva Linux 2007 Spring o The parser did not detect that the argument of not could be a variable o Name clashes when loading programs and asserting rules are avoided

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