DES 1.6.0 Released

[fernan]

[Apologies for multiple receptions]

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

  Datalog Educational System version 1.6.0
  http://des.sourceforge.net

has been launched on 28th, July, 2008 and ported to 

  GNU Prolog 1.3.0

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 1.6.0 of DES adds to previous version (1.5.0):

Enhancements:
    o    SQL query language added to the system: DDL (Data Definition 
Language), DML (Data Manipulation Language), and DQL (Data Query Language)
    o    Common database for different query languages. Relations defined via 
SQL or via Datalog can be interchangeably accessed by queries in any language
    o    Pretty-print listings for Datalog programs and SQL statements
    o    Processing of batch files via the new command /process File
    o    Display of 'File not found' errors 
    o    Lexicographically ordered listings
    o    New commands:
        §    /datalog Switches to Datalog interpreter
        §    /datalog Query Executes a Datalog query
        §    /prolog Switches to Prolog interpreter
        §    /sql Switches to SQL interpreter
        §    /sql Query Executes a SQL query
        §    /dbschema Displays the database schema
        §    /pretty_print Switch Enables/Disables pretty print
        §    /pretty_print Switch Enables/Disables pretty print
        §    /process File Processes the contents of File as if they were typed 
at the system prompt
Changes:
    o    Changed some output formatting for the debugger
    o    Some tweaks on system messages, mainly referring to 
safety/computability
    o    Initial status: Program transformation and time display are disabled 
by default
    o    System status is listed at start-up
    o    Listings of Datalog rules are ordered
Fixed bugs:
    o    The debugger in Sicstus-based releases yielded incorrect results
    o    Asserting/Consulting some unsafe clauses without program 
transformation yielded failure, raising an input error /failing to consult