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+\documentclass{article}
+\usepackage{axiom}
+\begin{document}
+\title{\$SPAD/src/interp astr.boot}
+\author{The Axiom Team}
+\maketitle
+\begin{abstract}
+\end{abstract}
+\eject
+\tableofcontents
+\eject
+\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>>
+
+)package "BOOT"
+
+--% Attributed Structures (astr)
+-- For objects which are pairs where the CAR field is either just a tag
+-- (an identifier) or a pair which is the tag and an association list.
+ 
+-- Pick off the tag
+ncTag x ==
+   not PAIRP x => ncBug('S2CB0031,[])
+   x := QCAR x
+   IDENTP x => x
+   not PAIRP x => ncBug('S2CB0031,[])
+   QCAR x
+ 
+-- Pick off the property list
+ncAlist x ==
+   not PAIRP x => ncBug('S2CB0031,[])
+   x := QCAR x
+   IDENTP x => NIL
+   not PAIRP x => ncBug('S2CB0031,[])
+   QCDR x
+
+ --- Get the entry for key k on x's association list
+ncEltQ(x,k) ==
+   r := QASSQ(k,ncAlist x)
+   NULL r => ncBug ('S2CB0007,[k])
+   CDR r
+ 
+-- Put (k . v) on the association list of x and return v
+-- case1: ncPutQ(x,k,v) where k is a key (an identifier), v a value
+--        put the pair (k . v) on the association list of x and return v
+-- case2: ncPutQ(x,k,v) where k is a list of keys, v a list of values
+--        equivalent to [ncPutQ(x,key,val) for key in k for val in v]
+ncPutQ(x,k,v) ==
+   LISTP k =>
+      for key in k for val in v repeat ncPutQ(x,key,val)
+      v
+   r := QASSQ(k,ncAlist x)
+   if NULL r then
+      r := CONS( CONS(k,v), ncAlist x)
+      RPLACA(x,CONS(ncTag x,r))
+   else
+      RPLACD(r,v)
+   v
+ 
+@
+\eject
+\begin{thebibliography}{99}
+\bibitem{1} nothing
+\end{thebibliography}
+\end{document}