There are currently implementations of XLisp running on the IBM- PC and clones under MS-DOS, on the Macintosh, the Atari-ST and the Amiga. It is completely written in the programming language C and is easily extended with user written built-in functions and classes. It is available in source form to non-commercial users.
Many Common Lisp functions are built into XLisp. In addition, XLisp defines the objects Object and Class as primitives. Object is the only class that has no superclass and hence is the root of the class hierarchy tree. Class is the class of which all classes are instances (it is the only object that is an instance of itself).
For more details see the CMU Artificial Intelligence Repository - XLISP
A full description of the XLisp language can also be found in Appendix C of the Nyquist Reference Manual.
This page is linked from: Nyquist
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