Initial population.

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+\documentclass{article}
+\usepackage{axiom}
+\begin{document}
+\title{\$SPAD/src/algebra void.spad}
+\author{Stephen M. Watt}
+\maketitle
+\begin{abstract}
+\end{abstract}
+\eject
+\tableofcontents
+\eject
+\section{domain VOID Void}
+<<domain VOID Void>>=
+)abbrev domain VOID Void
+-- These types act as the top and bottom of the type lattice
+-- and are known to the compiler and interpreter for type resolution.
+++ Author: Stephen M. Watt
+++ Date Created: 1986
+++ Date Last Updated: May 30, 1991
+++ Basic Operations: 
+++ Related Domains: ErrorFunctions, ResolveLatticeCompletion, Exit
+++ Also See:
+++ AMS Classifications:
+++ Keywords: type, mode, coerce, no value
+++ Examples:
+++ References:
+++ Description:
+++   This type is used when no value is needed, e.g., in the \spad{then}
+++   part of a one armed \spad{if}.
+++   All values can be coerced to type Void.  Once a value has been coerced
+++   to Void, it cannot be recovered.
+
+Void: with
+        void: () -> %            ++ void() produces a void object.
+        coerce: % -> OutputForm  ++ coerce(v) coerces void object to outputForm.
+    == add
+        Rep := String
+        void()      == voidValue()$Lisp
+        coerce(v:%) == coerce(v)$Rep
+
+@
+\section{domain EXIT Exit}
+<<domain EXIT Exit>>=
+)abbrev domain EXIT Exit
+++ Author: Stephen M. Watt
+++ Date Created: 1986
+++ Date Last Updated: May 30, 1991
+++ Basic Operations: 
+++ Related Domains: ErrorFunctions, ResolveLatticeCompletion, Void
+++ Also See:
+++ AMS Classifications:
+++ Keywords: exit, throw, error, non-local return
+++ Examples:
+++ References:
+++ Description:
+++   A function which does not return directly to its caller should
+++   have Exit as its return type.
+++
+++   Note: It is convenient to have a formal \spad{coerce} into each type from
+++   type Exit. This allows, for example, errors to be raised in 
+++   one half of a type-balanced \spad{if}.
+Exit: SetCategory == add
+        coerce(n:%) == error "Cannot use an Exit value."
+        n1 = n2     == error "Cannot use an Exit value."
+
+@
+\section{package RESLATC ResolveLatticeCompletion}
+<<package RESLATC ResolveLatticeCompletion>>=
+)abbrev package RESLATC ResolveLatticeCompletion
+++ Author: Stephen M. Watt
+++ Date Created: 1986
+++ Date Last Updated: May 30, 1991
+++ Basic Operations: 
+++ Related Domains: ErrorFunctions, Exit, Void
+++ Also See:
+++ AMS Classifications:
+++ Keywords: mode, resolve, type lattice
+++ Examples:
+++ References:
+++ Description:
+++   This package provides coercions for the special types \spadtype{Exit}
+++   and \spadtype{Void}.
+ResolveLatticeCompletion(S: Type): with
+        coerce: S -> Void 
+             ++ coerce(s) throws all information about s away.
+             ++ This coercion allows values of any type to appear
+             ++ in contexts where they will not be used.
+             ++ For example, it allows the resolution of different types in
+             ++ the \spad{then} and \spad{else} branches when an \spad{if}
+             ++ is in a context where the resulting value is not used.
+        coerce: Exit -> S
+             ++ coerce(e) is never really evaluated.  This coercion is 
+             ++ used for formal type correctness when a function will not
+             ++ return directly to its caller.
+    == add
+        coerce(s: S): Void == void()
+        coerce(e: Exit): S ==
+            error "Bug: Should not be able to obtain value of type Exit"
+
+@
+\section{License}
+<<license>>=
+--Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd.
+--All rights reserved.
+--
+--Redistribution and use in source and binary forms, with or without
+--modification, are permitted provided that the following conditions are
+--met:
+--
+--    - Redistributions of source code must retain the above copyright
+--      notice, this list of conditions and the following disclaimer.
+--
+--    - Redistributions in binary form must reproduce the above copyright
+--      notice, this list of conditions and the following disclaimer in
+--      the documentation and/or other materials provided with the
+--      distribution.
+--
+--    - Neither the name of The Numerical ALgorithms Group Ltd. nor the
+--      names of its contributors may be used to endorse or promote products
+--      derived from this software without specific prior written permission.
+--
+--THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+--IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+--TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+--PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+--OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+--EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+--PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+--PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+--LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+--NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+--SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+@
+<<*>>=
+<<license>>
+ 
+<<domain VOID Void>>
+<<domain EXIT Exit>>
+<<package RESLATC ResolveLatticeCompletion>>
+@
+\eject
+\begin{thebibliography}{99}
+\bibitem{1} nothing
+\end{thebibliography}
+\end{document}