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+\documentclass{article}
+\usepackage{axiom}
+\begin{document}
+\title{\$SPAD/src/interp ptrop.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"
+
+--% Utility operations on Abstract Syntax Trees
+ 
+-- An S-expression which people can read.
+pfSexpr pform ==
+    strip pform where
+         strip pform ==
+            pfId? pform       => pfIdSymbol pform
+            pfLiteral?  pform => pfLiteralString pform
+            pfLeaf? pform     => tokPart pform
+ 
+            pfApplication? pform =>
+                args :=
+                    a := pfApplicationArg pform
+                    if pfTuple? a then pf0TupleParts a else [a]
+                [strip p for p in cons(pfApplicationOp pform, args)]
+ 
+            cons(pfAbSynOp pform, [strip p for p in pfParts pform])
+ 
+pfCopyWithPos( pform , pos ) == 
+    pfLeaf? pform =>         pfLeaf( pfAbSynOp pform , tokPart pform , pos )
+    pfTree( pfAbSynOp pform , [ pfCopyWithPos( p , pos ) for p in pfParts pform ] )
+ 
+pfMapParts(f, pform) ==
+    pfLeaf? pform => pform
+    parts0 := pfParts pform
+    parts1 := [FUNCALL(f, p) for p in parts0]
+    -- Return the original if no changes.
+    same := true
+    for p0 in parts0 for p1 in parts1 while same repeat same := EQ(p0,p1)
+    same => pform
+    pfTree(pfAbSynOp pform, parts1)
+ 
+ 
+pf0ApplicationArgs pform ==
+    arg := pfApplicationArg pform
+    pf0FlattenSyntacticTuple arg
+ 
+pf0FlattenSyntacticTuple pform ==
+    not pfTuple? pform => [pform]
+    [:pf0FlattenSyntacticTuple p for p in pf0TupleParts pform]
+ 
+
+@
+\eject
+\begin{thebibliography}{99}
+\bibitem{1} nothing
+\end{thebibliography}
+\end{document}