Installation:

1. Download Datalog Educational System (DES).

   • We recommend using versions built with SWI-Prolog, e.g. Windows or Unixes

2. Unzip the archive to a folder of your choice.

3. You can run DES in console mode (des.exe or des).

   • Unixes: File des needs execute permission:
     cd /path/to/des
chmod +x des

   • Linux (Ubuntu): Note that DES might need the packages unixodbc-dev, unixodbc-bin and unixodbc. Install with:
     sudo apt-get install unixodbc-dev unixodbc-bin unixodbc

First steps:

1. Start DES as described in the last steps above.

   • In subfolder doc you can find a manual: manualDES.pdf

   • In subfolder examples you can find many examples. The following examples are particularly interesting: bom.dl, family.dl, and flight.dl

2. After starting DES:

   • /help gives you an overview of all the available commands. Particularly important are:
   • /r file loads a (e.g.) datalog program

   • /datalog goal solves a goal based on the loaded program

   • example:
     /r examples/family.dl
/datalog ancestor(X,Y). (or just: ancestor(X,Y).)

   • In contrast, /prolog ancestor(X,Y). executes the goal as a Prolog program on a tuple by tuple basis

   • /q quits DES

Build own executable with SWI-Prolog:

We recommend using the pre-built packages as described above. However, you can also build your own executable for DES with SWI-Prolog. This requires an installation of SWI-Prolog 7.x.

1. Download the source code of Datalog Educational System (DES).

2. Follow the instructions in the Building Guide.