X-Windows Interface

this document we present a Prolog written portable graphical package for Prolog applications. The system is highly independent from the Prolog engine and we expect to support it on different windowing systems. The system is composed of a lower level interface to a windowing system, a graphical interface toolkit and development tools to build and enhance user interfaces. By using Prolog as the implementation language we expect to simplify: the integrating of user interfaces with applications; the extension of the basic widget set with new classes more adapted to Artificial Intelligence and Logic Programming; and the portability of applications across windowing systems, as well as Prolog engines. This work shows that not only is Prolog a suitable language to define user interfaces from standard widgets sets, due to its powers of declaration and expression, but also that current Prolog compilers are efficient enough to manage user interaction thus enabling the rapid prototyping of widgets for unconventional interfaces. 2 CONTENTS Chapter 1 Overview The basic design goals of this graphical package system can be summarized as follows