swi-prolog-x Subpackage of pl

SWI-Prolog is a fast and powerful ISO/Edinburgh-style Prolog compiler with a rich set of built-in predicates. It offers a fast, robust and small environment which enables substantial applications to be developed with it. SWI-Prolog additionally offers: * A powerful module system * Garbage collection * Unicode character set handling * Unbounted integer and rational number arithmetic * Multithreading support * A powerful C/C++ interface * GNU Readline interface This package contains XPCE, an object-oriented symbolic programming environment for user interfaces. Although XPCE was designed to be language-independent, it has gained the most popularity with Prolog. XPCE follows a rather unique approach for developing GUI applications, as follows: - Add object layer to Prolog - High level of abstraction - Exploit rapid Prolog development cycle - Platform independent programs

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