-*- mode:Text -*-
Copyright 1992 Patrick H. Winston.  All rights reserved.
Version 1.1.1, transferred from master disk on 23 Apr 93
 
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WARNING

Remove the code that loads the clos.lsp file from the frames.exp
file if your Lisp system includes the Common Lisp Object System.
The clos.lsp file contains a micro version of the Common Lisp
Object System that may crash your Lisp if your Lisp already has
a definition for DEFCLASS, DEFMETHOD, or MAKE-INSTANCE.

In particular, if you are using a Symbolics machine, remove the
code that loads the clos.lsp file and type the following:

(in-package "future-common-lisp-user")

PURPOSE

Provides program support for Chapter 9, Frames and Inheritance.
Illustrates inheritance using dwarfs and earthquakes.

PERFORMANCE EXPERIMENT 1

Examine the file frames.exp.  Evaluate each Lisp expression in
the file one at a time, noting what each does.

PERFORMANCE EXPERIMENT 2

Type the following:

(show (make-instance 'earthquake))

KNOWLEDGE ENGINEERING EXPERIMENT 1

Editing the class definitions and/or the methods frames.lsp.  Note
how each edit changes the results.

KNOWLEDGE ENGINEERING EXPERIMENT 2

Create a frame system describing weddings and birthday party events.

KNOWLEDGE ENGINEERING EXPERIMENT 3

Create a frame system describing the instructors at your
university.

MEDIUM-SCALE LISP PROJECT

Modify clos.lsp such that you can define :around methods.

LARGE-SCALE LISP PROJECT

Modify clos.lsp such that methods are compiled, not just remembered
as LAMBDA expressions.