path: root/Master/texmf-dist/source/latex/combine/combine.dtx

% \iffalse meta-comment
%
% combine.dtx
% Author: Peter Wilson, Herries Press
% Maintainer: Will Robertson (will dot robertson at latex-project dot org)
% Copyright 2000, 2001, 2002, 2003, 2004 Peter R. Wilson
% Copyright 2010 Will Robertson
%
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either
% version 1.3c of this license or (at your option) any
% later version: <http://www.latex-project.org/lppl.txt>
%
% This work has the LPPL maintenance status "maintained".
% The Current Maintainer of this work is Will Robertson.
%
% This work consists of the files listed in the README file.
%
%<*driver>
\NeedsTeXFormat{LaTeX2e}
\ProvidesFile{combine.dtx}
%</driver>
%<usc>\ProvidesClass{combine}
%<pck>\ProvidesPackage{combinet}
%<natpack>\ProvidesPackage{combnat}
%<citepack>\ProvidesPackage{combcite}
%<*usc|pck|natpack|citepack>
  [2010/07/10 v0.7a
%</usc|pck|natpack|citepack>
%<usc>              collection of documents
%<pck>              document titles in ToC
%<natpack>          combine version of natbib package
%<citepack>         combine version of cite package
%<*usc|pck|natpack|citepack>
  ]
%</usc|pck|natpack|citepack>
%
%<*driver>
\documentclass[twoside]{ltxdoc}
\makeatletter \@mparswitchfalse \makeatother
\EnableCrossrefs
\CodelineIndex
%%\OnlyDescription
\renewcommand{\MakeUppercase}[1]{#1}
\pagestyle{headings}
\setcounter{StandardModuleDepth}{1}
\begin{document}
  \DocInput{combine.dtx}
\end{document}
%</driver>
%
% \fi
%
% \CheckSum{3858}
%
% \DoNotIndex{\',\.,\@M,\@@input,\@addtoreset,\@arabic,\@badmath}
% \DoNotIndex{\@centercr,\@cite}
% \DoNotIndex{\@dotsep,\@empty,\@float,\@gobble,\@gobbletwo,\@ignoretrue}
% \DoNotIndex{\@input,\@ixpt,\@m}
% \DoNotIndex{\@minus,\@mkboth,\@ne,\@nil,\@nomath,\@plus,\@set@topoint}
% \DoNotIndex{\@tempboxa,\@tempcnta,\@tempdima,\@tempdimb}
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% \DoNotIndex{\arabic,\ast,\begin,\begingroup,\bfseries,\bgroup,\box}
% \DoNotIndex{\bullet}
% \DoNotIndex{\cdot,\cite,\CodelineIndex,\cr,\day,\DeclareOption}
% \DoNotIndex{\def,\DisableCrossrefs,\divide,\DocInput,\documentclass}
% \DoNotIndex{\DoNotIndex,\egroup,\ifdim,\else,\fi,\em,\endtrivlist}
% \DoNotIndex{\EnableCrossrefs,\end,\end@dblfloat,\end@float,\endgroup}
% \DoNotIndex{\endlist,\everycr,\everypar,\ExecuteOptions,\expandafter}
% \DoNotIndex{\fbox}
% \DoNotIndex{\filedate,\filename,\fileversion,\fontsize,\framebox,\gdef}
% \DoNotIndex{\global,\halign,\hangindent,\hbox,\hfil,\hfill,\hrule}
% \DoNotIndex{\hsize,\hskip,\hspace,\hss,\if@tempswa,\ifcase,\or,\fi,\fi}
% \DoNotIndex{\ifhmode,\ifvmode,\ifnum,\iftrue,\ifx,\fi,\fi,\fi,\fi,\fi}
% \DoNotIndex{\input}
% \DoNotIndex{\jobname,\kern,\leavevmode,\let,\leftmark}
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% \DoNotIndex{\penalty,\PrintChanges,\PrintIndex,\ProcessOptions}
% \DoNotIndex{\protect,\ProvidesClass,\raggedbottom,\raggedright}
% \DoNotIndex{\refstepcounter,\relax,\renewcommand,\reset@font}
% \DoNotIndex{\rightmargin,\rightmark,\rightskip,\rlap,\rmfamily,\roman}
% \DoNotIndex{\roman,\secdef,\selectfont,\setbox,\setcounter,\setlength}
% \DoNotIndex{\settowidth,\sfcode,\skip,\sloppy,\slshape,\space}
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% \DoNotIndex{\wd,\xiipt,\year,\z@}
%
% \changes{v0.1}{2000/04/29}{First public release as `collection' class}
% \changes{v0.2}{2000/05/07}{First public release with class changed to `combine'}
% \changes{v0.3}{2000/05/20}{Fix newtheorem and letter class}
% \changes{v0.3}{2000/05/20}{Add title formatting}
% \changes{v0.4}{2000/05/27}{Reset counters, ToC formatting}
% \changes{v0.41}{2000/06/18}{Added and used \cs{appendiargdef}}
% \changes{v0.42}{2001/04/04}{Fixed(?) problem with fancyhdr package}
% \changes{v0.5}{2001/07/03}{Added the combnat package}
% \changes{v0.51}{2001/07/09}{Fixed problem with \cs{appendix} in imports}
% \changes{v0.51}{2001/07/09}{Fixed problem with ordering of 
%                             \cs{coltocauthor} and \cs{coltoctitle}}
% \changes{v0.52}{2001/08/25}{Fixed problem with `wrapped class' imports}
% \changes{v0.53}{2001/09/05}{Fixed problem with spaces in ToC entries}
% \changes{v0.54}{2001/12/19}{Added text about exam class}
% \changes{v0.6}{2002/08/24}{Added option for single bibliography}
% \changes{v0.61}{2003/05/22}{Minimal tweak to combnat}
% \changes{v0.62}{2003/07/19}{Minimal addition to combine}
% \changes{v0.63}{2003/11/09}{Memoir option added to combine}
% \changes{v0.63}{2003/11/09}{Added the combcite package}
% \changes{v0.64}{2004/03/06}{Minor change to combinet package}
% \changes{v0.64a}{2004/05/07}{Minor change to the abstract}
% \changes{v0.64b}{2009/09/02}{New maintainer (Will Robertson)}
% \changes{v0.7}{2010/03/22}{Bug fix and new (simpler) file versioning scheme}
%
% \GetFileInfo{combine.dtx}
%
% \newcommand*{\Lpack}[1]{\textsf {#1}}           ^^A typeset a package
% \newcommand*{\Lopt}[1]{\textsf {#1}}            ^^A typeset an option
% \newcommand*{\file}[1]{\texttt {#1}}            ^^A typeset a file
% \newcommand*{\Lcount}[1]{\textsl {\small#1}}    ^^A typeset a counter
% \newcommand*{\pstyle}[1]{\textsl {#1}}          ^^A typeset a pagestyle
% \newcommand*{\Lenv}[1]{\texttt {#1}}            ^^A typeset an environment
%
% \title{The \Lpack{combine} class and the packages\\ \Lpack{combinet}, 
%       \Lpack{combnat} and \Lpack{combcite}\thanks{This file (\texttt{combine.dtx})
%       has version number \fileversion, last revised \filedate.}}
%
% \author{%
% Peter Wilson, Herries Press^^A
%   \thanks{Dick Nickalls (\texttt{dicknickalls@compuserve.com})
%   provided several requirements and suggestions.
%   He also very helpfully tested earlier experimental versions.}\\
% \\~
% Maintainer: Will Robertson\\
% \texttt{will dot robertson at latex-project dot org}%
% }
% \date{\filedate}
% \maketitle
% \begin{abstract}
%    The \Lpack{combine} class can be used to assemble a group
% of individual \LaTeX{} documents into a single document,
% such as required for a conference proceedings. Typically the documents
% are all of the same class, but with some limitations on ordering
% may be of different classes (e.g., several \Lpack{article}s with 
% one \Lpack{letter}).
% The class requires the \Lpack{keyval} package.
%
% The accompanying \Lpack{combinet} and \Lpack{combnat} packages 
% respectively let
% the titles of imported documents be added to the main ToC, and
% enable the \Lpack{combine} class and the \Lpack{natbib} package
% to cooperate. The \Lpack{combcite} package enables the \Lpack{cite}
% package to cooperate.
% \end{abstract}
% \tableofcontents
%
% 
%
% \section{Introduction}
%
% Questions about making a collection of different articles into a single
% document 
% seem to pop up fairly regularly on the
% \texttt{comp.text.tex} newsgroup. 
%  The \Lpack{combine} class provides a solution for this problem.
%
% This manual is typeset according to the conventions of the
% \LaTeX{} \textsc{docstrip} utility which enables the automatic
% extraction of the \LaTeX{} macro source files~\cite{GOOSSENS94}.
%
%    Section~\ref{sec:usc} describes the usage of the \Lpack{combine} class and
% Sections~\ref{pack} and~\ref{natpack} describe the \Lpack{combinet} 
% and \Lpack{combnat} packages. Section~\ref{citepack} describes
% the \Lpack{combcite} package.
% Commented source code for the class is in Section~\ref{sec:code}.
% The class requires the \Lpack{keyval} package to be available.
% Commented source code for the \Lpack{combinet} package is in 
% Section~\ref{packcode}, for \Lpack{combnat} is in 
% Section~\ref{natpackcode} and for \Lpack{combcite} is in
% Section~\ref{citepackcode}.
%
%    Note that the version number and date given for this file does not
% necessarily match version numbers or dates for the class and packages.
%
% \section{The \Lpack{combine} class} \label{sec:usc}
%
%    The \Lpack{combine} class enables a group of individual
% \LaTeX{} documents to be imported and assembled into a single document. All
% the individual documents should be of the same class (e.g., all
% \Lpack{article} or all \Lpack{report}). 
%
%    Sectioning, cross-referencing, bibliographies, etc., are local within
% each imported document. Various means are provided for controlling local
% Table of Contents, the format of |\maketitle|, and so on, without having
% to make any changes to the original of an imported document.
%
%    Here is a simple example file which might be the skeleton for a
% conference proceedings.
% \begin{verbatim}
% \documentclass[11pt]{combine}
%
% \title{Proceedings of the ...}
% \author{A. N. Editor\thanks{Support ...}}
% \date{29 February, 2000}
%
% \begin{document}
% \pagestyle{combine}        % use the combine page style
% \maketitle                 % main title
% \tableofcontents           % main ToC
% \clearpage
% 
% \section{Editor's introduction} \label{intro}  % into main ToC (section 1)
% 
%     In the article by A.~N.~Author on page~\pageref{art1} ...
% 
% \begin{papers}                  % start of individual articles/papers
% \coltoctitle{An article}        % first article title into main ToC
% \coltocauthor{A.~N.~Author}     % first authors into main ToC
% \label{art1}
% \import{art1}                   % first article, may have own ToC, 
%                                 % bibliography, etc.
% \coltoctitle{Another article}   
% \coltocauthor{A.~N.~Other}
% \label{art2}
% \import{art2}
% \end{papers}                    % end of individual articles/papers
% 
% \clearpage
% \section{Acknowledgements}      % into main ToC (section 2)
% 
%     Among the many ...
% 
% \end{document}
% \end{verbatim}
%
% \subsection{Class options}
%
%    As well as providing all the class options appropriate for
% the class of the individual documents, the \Lpack{combine}
% class provides the following additional options:
% \begin{itemize}
% \item \Lopt{memoir}, \Lopt{book}, \Lopt{report}, and \Lopt{letter}. 
%       By default the \Lpack{article}
%       class is assumed for both the main and the imported documents.
%       These options change the class to \Lpack{memoir}, \Lpack{book}, \Lpack{report} or
%       \Lpack{letter}, respectively.
% \item \Lopt{colclass=\meta{class}}. This option changes
%       the `classes' to \meta{class}. For example, specifying
%       |colclass=phdthesis| will use the \Lpack{phdthesis} 
%       class\footnote{Whatever that is.} definitions
%       throughout the entire document.
%
%       Note that if you use this option there are likely to be \LaTeX{}
%       warnings about \texttt{Unused global option(s): [colclass=\ldots]}.
%
% \item \Lopt{classes}. This option enables the imported documents
%       to be of different classes. For example, embedding a letter
%       into a compendium of articles. Using this option may
%       induce a plethora of \LaTeX{} errors and the printed results
%       may be unpredictable. If this happens, try hitting `q' to 
%       put \LaTeX{} into
%       its `quiet batch' processing mode and then examine the typeset result
%       for usability. 
%
%         Different classes of imported documents should not be mixed
%       within a single |papers| environment. Also, imported documents
%       whose class is the same but which differs from the main class 
%       should be within a single |papers| environment. For example,
%       if several letters are to be imported into a collection
%       of articles, the letters must not be scattered between different
%       |papers| environments, although the imported articles can be 
%       scattered.
%
% \item \Lopt{packages}. By default all |\usepackage| commands in
%       imported documents are ignored. If this is not desired,
%       then the \Lopt{packages} option will enable the imported 
%       |\usepackage| commands(s). If this option is used, then only
%       the first occurrence of a package is actually used and is not
%       available to any later imported documents. 
%
%       Generally speaking, it is advisable to put all |\usepackage|
%       commands into the preamble of the main document.
%
% \item \Lopt{layouts}. By default, a single setting of the 
%       page layout is used throughout the document. The \Lopt{layouts}
%       option takes account of any changes to the |\textwidth|, 
%       |\textheight|, etc., in the imported documents.
%
% \item \Lopt{folios}. The page numbers are sequential throughout
%       the document. When the |plain| page style is used, the 
%       \Lopt{folios} option will display the
%       local page numbers of imported documents as well as the
%       the main page number. This may have unfortunate consequences
%       on the page numbers in ToC, etc., entries as they may well
%       refer to local rather than global page numbers.
%
% \item \Lopt{notoc}. Disables the inclusion of a Table of Contents
%       in any imported document.
% \item \Lopt{nolof}. Disables the inclusion of a List of Figures
%       in any imported document.
% \item \Lopt{nolot}. Disables the inclusion of a List of Tables
%       in any imported document.
% \item \Lopt{maintoc}. Adds all imported documents ToC, LoF, LoT, etc.,
%       entries to the main document ToC, LoF, \ldots
% \item \Lopt{notitle}. Disables title printing by any |\maketitle|
%       in any imported document.
% \item \Lopt{noauthor}. Disables author printing by any |\maketitle|
%       in any imported document.
% \item \Lopt{date}. By default, date printing by any |\maketitle|
%       in any imported document is disabled. This option causes
%       the date(s) to be printed.
% \item \Lopt{nomaketitle}. Disables all printing by any |\maketitle|
%       in any imported document. 
% \item \Lopt{nopubindoc}. Disables the printing of the |\published|
%       information within an imported document.
% \item \Lopt{nopubintoc}. Disables the printing of the |\published|
%       information within the main ToC.
% \item \Lopt{onebib}. Disables imported bibliographies and puts all
%       citations in the main document's bibliography.
% \item \Lopt{combinedbib}. Individual imported bibliographies and 
%       also all citations put into the main document's bibliography.
% \end{itemize}
%
% The \Lpack{combine}
% class may be able to incorporate any class of imported documents by
% setting an appropriate value for the \Lopt{colclass} option and perhaps
% doing some additional work.
%
% For example, if you want to have a collection of examination papers
% which were each is originally produced using the \Lpack{exam} class, 
% then start off with: \\
% |\documentclass[...,colclass=exam]{combine} | \\
% The \Lpack{exam} class, though, does a couple of things that prevent
% \Lpack{combine} and \Lpack{exam} from working well together:
% \begin{itemize}
% \item \Lpack{exam} has its own version of |\section| which is totally at
%     odds with the normal \Lpack{article} definition, and |\section*| is
%     used by the |\tableofcontents| command.
% \item \Lpack{exam} does wonderful things at the end of a document. This
% is alright for imported documents in a |papers| environment but is an
% abject failure at the final end of the main document.
% \end{itemize}
%
%    To get round these problems, put the following in the preamble to
% the main document:
% \begin{verbatim}
% \makeatletter
% \let\oldsection\section     % keep exam's definition of \section
% \renewcommand{\section}{%   % article's definition of \section
%   \@startsection{section}{1]{\z@}%
%                 {-3.5ex \@plus -1ex \@minus -.2ex}%
%                 {2.3ex \@plus .2ex}%
%                 {\normalfont\Large\bfseries}}
% \makeatletter
% \end{verbatim}
% and in the document put: \\
% |\let\section\oldsection| \\
% immediately before the first |papers| environment.
%
%    For the end document problem, put:
% \begin{verbatim}
% \makeatletter
% \let\@enddocumenthook\@oldenddocumenthook
% \makeatother
% \end{verbatim}
% immediately before the main document's |\end{document}|.
%
%
% \subsection{Class commands and environments}
%
%    Within a \Lpack{combine} class document you can use any commands
% that are supported by the selected class.
% The following additional commands and environments are also
% provided.
%
% \DescribeEnv{papers}
% The environment |\begin{papers}[|\meta{text/code}|]...\end{papers}|
% provides a wrapper around imported file(s). Effectively, it modifies
% any |\documentclass| command or |document| environment within an
% imported file so that \LaTeX{} does not stop with an error at meeting
% these, or preamble-only commands like |\usepackage|, in the middle 
% of a document.
%
%    The optional argument is executed immediately at the start of
% the environment and its default value is |\cleardoublepage|. 
% To avoid any forced page breaking you can call the environment with
% an empty optional argument (e.g., |\begin{papers}[]|).
% 
%
% \DescribeMacro{\import}
% The command |\import{|\meta{texfile}|}| is a cross between the |\input|
% and |\include| commands, and should only be used within a |papers|
% environment. \meta{texfile} is the name of a \LaTeX{} file \emph{without}
% the |.tex| extension. For example, |\import{fred}| will attempt to
% read in a file called |fred.tex|. The \meta{texfile} should be a
% complete \LaTeX{} document file, from |\documentclass...| to
% |\end{document}|. The contents of \meta{texfile} will be typeset in
% the document at the point where it is imported, including any document
% title (via a |\maketitle|), Table of Contents, \ldots, Bibliography, etc.
%
% \DescribeMacro{\maketitle}
% The \Lpack{combine} class provides a |\maketitle| command, together with
% |\title|, |\author| and |\date| commands like those in the 
% \Lpack{book/report/article} classes. A \Lopt{titlepage} option is only
% supported if the main class has a \Lopt{titlepage} option. For example,
% if the main class is \Lpack{article} then both |\maketitle| and the
% \Lopt{titlepage} option are supported, but if the main class is 
% \Lpack{letter} then only the |\maketitle| command is provided.
%
% \DescribeMacro{\maintitlefont}
% \DescribeMacro{\postmaintitle}
% \DescribeMacro{\mainauthorfont}
% \DescribeMacro{\postmainauthor}
% \DescribeMacro{\maindatefont}
% \DescribeMacro{\postmaindate}
%  These commands control the typesetting of the main document's |\maketitle|
% command. The |\title| is processed between the |\maintitlefont| and
% |\postmaintitle| commands; that is, like: \\
% |{\maintitlefont \title \postmaintitle}| \\
% and similarly for the |\author| and |\date| commands. The |\...main...|
% commands are initialised to mimic the normal result of |\maketitle|
% typesetting in the \Lpack{article/report} classes. 
% For example, the default definitions of the |\...maintitle...|
% and |\...mainauthor...| commands are:\par
% \begin{small}
% \begin{verbatim}
% \newcommand{\maintitlefont}{\begin{center}\LARGE}
% \newcommand{\postmaintitle}{\par\end{center}\vskip 0.5em}
% \newcommand{\mainauthorfont}{\begin{center}
%             \large \lineskip 0.5em%
%             \begin{tabular}[t]{c}}
% \newcommand{\postmainauthor}{\end{tabular}\par\end{center}}
% \end{verbatim}
% \end{small}\par
% They can be renewed to obtain different effects, for instance removing
% the |center| environment from |\...title...| will result in the title 
% being typeset as a normal paragraph.
%
% \DescribeMacro{\importtitlefont}
% \DescribeMacro{\postimporttitle}
% \DescribeMacro{\importauthorfont}
% \DescribeMacro{\postimportauthor}
% \DescribeMacro{\importdatefont}
% \DescribeMacro{\postimportdate}
%    Without any options, the |\title| and |\author| commands
% are typeset by |\maketitle| commands in imported documents. 
% Like the main document's |\maketitle|, the typesetting is controlled
% by these |\...import...| commands. The default definition for
% the title and author differ a little from the main document style, 
% and are:\par
% \begin{small}
% \begin{verbatim}
% \newcommand{\importtitlefont}{\begin{center}\LARGE\bfseries}
% \newcommand{\postimporttitle}{\par\end{center}}
% \newcommand{\importauthorfont}{\begin{center}
%             \large\itshape \lineskip 0.5em%
%             \begin{tabular}[t]{c}}
% \newcommand{\postimportauthor}{\end{tabular}\par\end{center}}
% \end{verbatim}
% \end{small}\par
% The commands can be renewed to obtain different formatting.
%
%    Note that if the \Lpack{titling} package is used with the \Lpack{combine}
% class, the \Lpack{titling} maketitle typesetting commands are unavailable,
% being replaced by the corresponding \Lpack{combine} commands above. Other
% aspects of \Lpack{titling}, like the |\thetitle| command, are still
% available for use.
%
% \DescribeMacro{\bodytitle}
% The |\bodytitle[|\meta{short title}|]{|\meta{long title}|}| command
% is similar
% to a |\chapter| or |\section| command, depending on the \meta{class}
% of document. It may be used for adding a numbered title heading into 
% the main
% document and ToC for the following |\import{|\meta{texfile}|}|. There
% is also a starred version of the command, which produces an unnumbered
% title heading and makes no entry in the ToC. The numbering used for
% |\bodytitle| is independent from any other numbering sequence.
%
% \DescribeMacro{\coltoctitle}
% \DescribeMacro{\coltocauthor}
% The two commands |\coltoctitle{|\meta{title}|}| and 
% |\coltocauthor{|\meta{author}|}| are for adding \meta{title} and 
% \meta{author} to the main ToC, where \meta{title} is the compiler's
% choice for the title of the following |\import{|\meta{texfile}|}|
% and \meta{author} is for the names of the authors.
%
% \DescribeMacro{\published}
% The command |\published[|\meta{short}|]{|\meta{long}|}| can be used
% for putting the \meta{long} text into the body of the main document.
% If the optional argument is not used, then \meta{long} is also added
% to the main ToC. If the optional argument is used, then \meta{short}
% instead of \meta{long} is added to the ToC. The expectation is that this
% will be used for noting the original publication information for an
% imported document.
%
% \DescribeMacro{\pubfont}
% In the document body the text of the |\published| command is typeset
% using |\pubfont|. By default this is defined as |{\normalfont\centering}| to
% give centered text in the normal font. If, for example, you wanted
% it to be typeset ragged right in an italic font you would do: \\
% |\renewcommand{\pubfont}{\itshape\raggedright}|
%
% \DescribeMacro{\toctitleindent}
% \DescribeMacro{\tocauthorindent}
% \DescribeMacro{\tocpubindent}
% \DescribeMacro{\toctocindent}
%    These are all lengths, and their values can be changed using
% |\setlength|. They control the extra indentation of an imported
% document's title, authors, publication information and section
% headings within the main ToC. The default value of |\toctitleindent|
% is 0em and the default for the other four is 1.5em. If any values 
% are changed, this must be
% done before the |\tableofcontents| command in the main document.
% For example, the title texts are aligned at the left margin;
% to align them with the default position of authors do: \\
% |\setlength{\toctitleindent}{1.5em}|
%
% \DescribeMacro{\toctitlefont}
% \DescribeMacro{\tocauthorfont}
% \DescribeMacro{\tocpubfont}
%    These macros specify the fonts to be used for typesetting the
% imported titles, authors and publishing information within the main ToC.
% Their default definitions are: \\
% |\newcommand{\toctitlefont}{\bfseries}|  % bold titles \\
% |\newcommand{\tocauthorfont}{\itshape}|  % italic authors \\
% |\newcommand{\tocpubfont}{\normalfont}|  % normal font for published 
%
%    The class tries to keep any group of title/author/published entries 
% in the ToC on one page, but sometimes TeX will insert a pagebreak anyway.
% The way of combating this is to make sure that the ToC page is broken
% \emph{before} the group. You can do this like: \\
% |\addtocontents{toc}{\protect\pagebreak}| \\
% |\coltoctitle{...} \coltocauthor{...}| etc.
% 
% \DescribeMacro{\erasetitling}
%     This macro `undefines' any previous |\coltoctitle|, |\coltocauthor|
% and/or |\published| commands; it is principally provided for use with the
% \Lpack{combinet} package.
%
%
% \DescribeMacro{combine}
%  A new |combine| pagestyle is provided. This is like the |plain|
% pagestyle except that page numbers are put at the bottom outside corner
% of the page. This is the default pagestyle for the \Lpack{combine}
% class.
% 
%    Provided a |plain| (or |combine|) page style is used the pages 
% are numbered in sequence throughout the document. If an imported document
% has any |empty| page style pages these will not be numbered. 
%
%    Unless the \Lopt{folios} option is used, all references to page
% numbers will be to the global page number. With the \Lopt{folios}
% options some references will be to global page numbers and some to
% local page numbers.
%
%    You can, of course, define your own heading styles; I recommend
% the \Lpack{fancyhdr} package~\cite{FANCYHDR} if you do this. For example,
% if you had a collection of papers and you wanted to have the
% headers on the lefthand pages to have the title of the collection
% and the righthand pages to have the name of the current author(s), you
% can do this along the following lines.
% \begin{verbatim}
% \documentclass[report,twoside]{combine}
% \usepackage{fancyhdr}
% \title{The collection}
% \author{A. N. Editor}
% \pagestyle{fancy}
% \fancyhead[RO]{A. N. Editor}
% \fancyhead[LE]{The collection}
% \fancyfoot{}
% \fancyfoot[LE,RO]{\thepage}
% \newcommand{\authortochead}[1]{%
%    \coltocauthor{#1}
%    \fancyhead[RO]{#1}
%  }
% ...
% \begin{document}
% \maketitle
% %% Editors introduction, ToC, etc
% \begin{papers}
% \coltoctitle{Paper 1}
% \authortochead{A. N. Author}
%     \import{paper1}
% \cleardoublepage
% \coltoctitle{Paper 2}
% \authortochead{A. N. Other}
%     \import{paper2}
% ...
% \end{verbatim}
%  
%
%    In order to ensure that all the material in an imported document
% is typeset, there is an inbuilt |\clearpage| command within the
% imported document's |\end{document}|. Thus, any material after an
% |\import| command will start on a new page.
%
%    Here is another example file which might be the skeleton for a
% thesis that includes a copy of a published paper.
% \begin{verbatim}
% %%\documentclass{thesis}  % replace this by
% \documentclass[colclass=thesis,classes,layouts]{combine}
% ... packages etc.,
%
% \title{Observations on the ...}
% \author{A. Candidate}
% \date{1 April, 2000}
% \addtolength{\toctitleindent}{2.3em}  % extra main ToC indentation
% \addtolength{\tocauthorindent}{2.3em}
% \addtolength{\tocpubindent}{2.3em}
%
% \begin{document}
% \pagestyle{combine}        % use the combine page style
% \maketitle                 % main title
% \tableofcontents           % main ToC
% \clearpage
% ...
% lots of remarkable research results
% ...
% \appendix
% ...
% \section{Publication}
% \begin{papers}[]
% \coltoctitle{...}
% \published{Originally published in the   
%            \textit{Journal of Irreproducible Results}, 1987}
% \import{mypaper}
% \end{papers}
% ...
% 
% \bibliography{refs}      % main bibliography
% \end{document}
% \end{verbatim}
%
%    Each imported file generates its own \file{.aux}, \file{.toc}, etc.,
% files. If a BibTeX database is used for the literature references
% in an imported document, then BibTeX must be run against the imported
% document, \emph{not} the main document, to resolve the citations. 
% Citations are local to each imported document. There can, of course,
% also be a bibliography for citations made in the main document, as shown
% in the example file above.
%
% \DescribeMacro{\provideenvironment}
%    This macro is like the |\providecommand| macro except that it applies
% to an environment instead of a command. It is required internally
% by the \Lpack{combine} class.
%
% \DescribeMacro{\providelength}
% \DescribeMacro{\providecounter}
%     These macros are used internally. They are |\provide...|
% versions of the |\newlength| and |\newcounter| commands.
%
% \DescribeMacro{\zeroextracounters}
%    The class attempts to initialise the counters used by each imported 
% document. For example, the figure, equation, etc., counters are zeroed
% for each document. The |\zeroextracounters| command can be redefined so
% that it includes the zeroing of any additional counters that might have
% been introduced in a package or defined by the author. For example,
% if two different imports both define a (new) counter called, say, 
% |mycounter|, then redefine the command like:
% \begin{verbatim}
% \renewcommand{\zeroextracounters}{%
%    \@ifundefined{c@mycounter}{}{\setcounter{mycounter}{0}}
% }
% \end{verbatim}
%
% \DescribeMacro{\appendiargdef}
% The (internal) command |\appendiargdef{|\meta{macro}|}{|\meta{stuff}|}|
% appends \meta{stuff} at the end of the current definition of \meta{macro},
% where \meta{macro} is the name of a macro (including the backslash)
% which takes one argument. For example the following are two equivalent
% definitions of |\mymacro|:
% \par\begin{small}\begin{verbatim}
% \newcommand{\mymacro}[1]{#1 is a bagpiper}
% \appendiargdef{\mymacro}{ and of course is tone deaf}
% % or
% \newcommand{\mymacro}[1]{#1 is a bagpiper and of course is tone deaf}
% \end{verbatim}
% \end{small}\par
%
% \DescribeMacro{\emptyAtBeginDocument}
%  Some combinations of circumstances cause an infinite recursion at the 
% start of an imported document; in particular the combination of 
% \texttt{combine + graphicx + caption2 + pdflatex} causes this. In this case
% the solution was to put |\emptyAtBeginDocument| immediately after the
% initial |\begin{document}|. It may also have worked if it had been added
% after each |\begin{papers}| or before each |\import{}|. An error message
% about being out of stack space may indicate recursion. Judicious use
% of |\emptyAtBeginDocument| may resolve the problem. 
% 
% \subsection{Imports in subdirectories}
%
%    Authors may find it convenient to put the LaTeX source files for imported
% documents into subdirectories of the directory for the main document.
% Perhaps the easiest way to make this work is to set an environment
% variable so that LaTeX will look in the subdirectories of the current
% working directory for files it can't find.
%
%    I use a teTeX system and can only talk about that distribution.
% The relevant environment variable, at least for document files, is
% |TEXINPUTS|. An example setting for this is: \\
% |TEXINPUTS=.//:${LOCALTEX}//:| \\
% The fragment |.//| tells LaTeX to look for files in the current directory, 
% and recursively in its subdirectories. The fragment |:${LOCALTEX}//| tells
% LaTeX to look for files in the place defined by the environment variable
% |LOCALTEX|, and recursively in its subdirectories. The final |:| tells
% LaTeX to look in the standard teTeX defined places.
%
% \section{The \Lpack{combinet} package} \label{pack}
%
%    The \Lpack{combinet} (COMBINE Title) package, 
% which should only be used in conjunction
% with the \Lpack{combine} class, modifies the |\maketitle| command of
% all imported documents so that the imported document's title and/or 
% author, if
% defined, are automatically added to the main document's ToC.
%
%    This is presented as a package rather than as part of the 
% \Lpack{combine} class as some unfortunate side effects may become
% apparent.
% 
%    If a |\coltoctitle| or |\coltocauthor| command has been given
% immediately prior to the import, then these will be put into the main
% ToC instead of the |\maketitle| texts. The |\erasetitling| command can
% be used to disable any prior |\coltoctitle|, |\coltocauthor| and
% |\published| commands.
%
%    The package takes the following options.
% \begin{itemize}
% \item \Lopt{nomtitle}. Disable the |\maketitle| title 
%       from being added to the main ToC.
% \item \Lopt{nomauthor}. Disable the |\maketitle| author
%       from being added to the main ToC.
% \item \Lopt{nothanks}. By default, the contents of a |\thanks| command
%       will be added to the main ToC. This option prevents that, but 
%       may have unfortunate side effects if any |\title| or |\author|
%       command has any embedded commands within the text.
% \item \Lopt{pub}. Put the text of an immediately prior |\published|
%      command after the |\maketitle| typesetting, and add the text to the
%      main ToC after any title or author. Remember that the \Lpack{combine}
%      class options \Lopt{nopubindoc} and \Lopt{nopubindoc} can be used
%      to inhibit printing of |\published| information.
% \item \Lopt{pubtop}. Put the text of an immediately prior |\published|
%      command at the top of the |\maketitle| typesetting, and add the 
%      text to the
%      main ToC after any title or author.
% \end{itemize}
%
%   As noted above, embedded commands within a |\title| or |\author| may
% not transform well if they appear in the main ToC. In such cases you can
% use |\coltoctitle| or |\coltocauthor| for adding appropriate text to
% the main ToC, not forgetting to disable these after the import via
% |\erasetitling|.
%
% \section{The \Lpack{combnat} package} \label{natpack}
%
%     The \Lpack{combine} class and Patrick Daly's \Lpack{natbib} 
% package~\cite{NATBIB}
% both redefine some of the same basic LaTeX macros, and naturally
% the redefinitions are incompatible\footnote{Discovered by
% Thomas Hertweck (\texttt{Thomas.Hertweck@gpi.uni-karlsruhe.de}) in
% June 2001.}.
%
%    The \Lpack{combnat} (COMBine NATbib) package hopefully resolves this
% problem. With the \Lpack{combine} class you use \Lpack{combnat} instead
% of \Lpack{natbib}. That is, instead of: \\
% |\usepackage[|\meta{natbib-options}|]{natbib}|, simply do \\
% |\usepackage[|\meta{natbib-options}|]{combnat}| \\
% in the preamble of the main document. The package automatically calls
% the \Lpack{natbib} package with the given \meta{natbib-options} and
% then redefines some of the \Lpack{natbib} redefinitions to ensure
% \Lpack{combine/natbib} compatibility.
%
%    For details on the \meta{natbib-options} and the other facilities,
% read the \Lpack{natbib} documentation~\cite{NATBIB}.
%
% \section{The \Lpack{combcite} package} \label{citepack}
%
%     The \Lpack{combine} class and Donald Aresneau's \Lpack{cite} 
% package~\cite{CITE}
% both redefine some of the same basic LaTeX macros, and naturally
% the redefinitions are incompatible\footnote{Discovered by
% Marcilio Alves (\texttt{maralves@usp.br}) in
% November 2003.}
%
%    The \Lpack{combcite} (COMBine CITE) package hopefully resolves this
% problem. With the \Lpack{combine} class you use \Lpack{combcite} instead
% of \Lpack{cite}. That is, instead of: \\
% |\usepackage[|\meta{cite-options}|]{cite}|, simply do \\
% |\usepackage[|\meta{cite-options}|]{combcite}| \\
% in the preamble of the main document. The package automatically calls
% the \Lpack{cite} package with the given \meta{cite-options} and
% then redefines some of the \Lpack{cite} redefinitions to ensure
% \Lpack{combine/cite} compatibility.
%
%    For details on the \meta{cite-options} and the other facilities,
% read the \Lpack{cite} documentation~\cite{CITE}.
%
%    The \Lpack{combcite} package requires the November 2003 version 4.01
% of \Lpack{cite}. This version covers the functions provided by the
% \Lpack{overcite} package. More precisely \\
% \verb?\usepackage[...]{overcite}? is implemented as \\
% \verb?\usepackage[superscript,...]{cite}?
%
%
% \section{Caveats}
%
%    \LaTeX{} was designed to typeset a single document, where the document
% has one and only one |\documentclass| command and one and only one
% |document| environment. The \Lpack{combine} class attempts to handle
% a document that has multiple |\documentclass| commands and multiple
% |document| environments. In order to do this certain parts of the
% \LaTeX{} kernel code has had to be modified. Unfortunately, to make
% the usage of \Lpack{combine} completely transparent to the user would
% require very major surgery, with a high probability that with my skills
% the patient would die; being able to remove a hangnail does not imply
% the ability to perform a heart transplant.
%
%    It is, of course, assumed that each imported document processes without
% error as an individual document.
%
%    Essentially, be prepared for the unexpected, usually indicated
% by a rash of \LaTeX{} error messages about undefined commands or about
% defining an already defined command. These are usually caused by incorrect
% grouping.
%
%    Commands, etc., defined in the main document are available to 
% all imported
% documents. The |papers| environment forms a group. Commands
% defined within a group are local to the group and are not visible outside
% it. Another point is that \LaTeX{} will read the code for any given
% class or package only once. These facts have some consequences.
%
% \begin{itemize}
% \item The facilities provided by any package that is used by an imported
%       file are only available within the first |papers| environment
%       in which the package is called for. This is why it is recommended
%       that all packages should be called for in the main document.
%
% \item Similarly for a class that is not the main class. For example,
%       if the main class is \Lpack{article} and some letters are to be
%       imported, then they must all be in the same |papers| environment.
%       If they are in multiple |papers| environments, then only the first
%       of these will have access to commands like |\address| which are
%       defined by the \Lpack{letter} class (which is only read once and
%       whose facilities are then local to the first of the |papers|).
%
% \item An imported document does not form a group (if it did, then only
%       a single letter could be imported into an article class collection).
%       If two imports in a single |papers| seperately use |\new...|
%       commands
%       with the same \meta{name}, then these \meta{name}s will be 
%       visible throughout
%       the environment. \LaTeX{} will then normally report trying to define a
%       pre-existing \meta{name}. The solution to this is either: (a) put
%       the imports into different |papers|, or (b) enclose each import
%       within a |\begingroup| \ldots |\endgroup| pair.
%
% \end{itemize}
%
%   Not all problems can be solved by the above methods. For example, consider
% the case again of importing letters into an article collection. If two
% letters both define the same \meta{name}, then adding additional grouping
% will only change the `defining a pre-existing \meta{name}' problem into
% the `undefined |\address|' problem. A potential solution in this 
% particular case
% would be to define all the \Lpack{letter} class specific \meta{name}s in the
% main document.
%
%    Within a |papers| environment all |\newcommand| and |\newenvironment|
% commands are replaced by |\providecommand| and |\provideenvironment|
% respectively. This should stop \LaTeX{} from reporting the pre-existing
% \meta{name} error from these commands, but one and only one of the
% definitions will be available. |\newlength| and |\newcounter| commands
% are handled in the same manner. There is no equivalent for |\newtheorem|,
% but instead the |\newtheorem| command has been made local instead
% of global, so cunning use of grouping should be able to circumvent the
% problem of two seperate authors creating identically named
% theorems.
%
%
%
% \StopEventually{
% \bibliographystyle{alpha}
% \begin{thebibliography}{GMS94}
%
% \bibitem[Ars03]{CITE}
% Donald Arseneau.
% \newblock \emph{Cite: Compressed, sorted lists of on-line
%                 or superscript numerical citations}.
% \newblock November 2003.
% \newblock (Available from CTAN in directory 
%           \texttt{macros/latex/contrib/cite})
%
% \bibitem[Dal99]{NATBIB}
% Patrick W. Daly.
% \newblock \emph{Natural Sciences Citations and References}.
% \newblock May 1999.
% \newblock (Available from CTAN in directory 
%           \texttt{macros/latex/contrib/natbib})
%
% \bibitem[GMS94]{GOOSSENS94}
% Michel Goossens, Frank Mittelbach, and Alexander Samarin.
% \newblock \emph{The LaTeX Companion}.
% \newblock Addison-Wesley Publishing Company, 1994.
%
% \bibitem[Oos96]{FANCYHDR}
% Piet van Oostrum.
% \newblock \emph{Page layout in LaTeX}.
% \newblock June 1996.
% \newblock (Available from CTAN in directory 
%           \texttt{macros/latex/contrib/fancyhdr})
%
%
% \end{thebibliography}
% }
%
% 
% \section{The \Lpack{combine} class code} \label{sec:code}
%
%    There are various difficulties to be overcome by the 
% \Lpack{combine} code, some seemingly inherent in \TeX{} itself and
% others by the \LaTeX{} kernel code. These include, but are not limited to:
% \begin{itemize}
%  \item TeX{} was not designed for processing multiple documents.
%  \item There can only be one |\documentclass| command within
% a document.
%  \item There are many \LaTeX{} commands that can only be used in
% the preamble, and the preamble is closed by the (first) |\begin{document}|.
%  \item There is a single global page number, which may be reset to one
% at any point in any document. If this occurs in an imported document
% then the page numbering for the main document is similarly reset.
%  \item |\label|s are global in nature, and with multiple imported
% documents there are likely to be labels with the same name in two
% or more of these.
%  \item Many of the kernel (and standard classes) commands use 
% the page number; sometimes the use is buried at the end of a chain 
% of macros.
% \end{itemize}
%
%    A design goal for \Lpack{combine} is that virtually any kind
% of document should be importable and should be processible without
% have to make any changes to it. To completely satisfy this would
% require a rewrite of much of the \LaTeX{} kernel, which is out
% of the question. Of necessity some changes have had to be made but
% these have been limited as far as possible. I think that a collection
% that consists of documents that are all of the same class should
% process without interruption. 
%
%    When there are mixed classes, \LaTeX{}
% reads in the code for each class. An example is importing a \Lpack{letter}
% class document into an \Lpack{article} class collection.
% If the same command is defined
% by |\newcommand| in two or more of these classes, then \LaTeX{}
% complains and I see no way of getting around this without rewriting
% all the classes and kernel to use |\def| instead of |\newcommand|.
% In any event, if this happens, try responding to the errors by hitting
% `q' to put \LaTeX{} into a batch mode. The typeset result may be useable.
%
%    To try and avoid name clashes, all the internal commands include
% the string |c@l|.
%
% \section{Preliminaries}
%
%    Announce the name and version of the class, which requires
% \LaTeXe{} and the \Lpack{keyval} package.
% (This now happens at the top of DTX file so doesn't appear here.)
% \changes{v0.53}{2001/09/05}{Class is now v0.45}
% \changes{v0.6}{2002/08/24}{Class is now v0.5}
% \changes{v0.63}{2003/11/09}{Class is now v0.52}
%    \begin{macrocode}
%<*usc>
\RequirePackage{keyval}
%    \end{macrocode}
%
% \begin{macro}{\c@lclass}
% |\c@lclass| stores the class name, which by default is |article|.
%    \begin{macrocode}
\newcommand{\c@lclass}{article}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@l@tempa}
% \begin{macro}{\c@l@getoptionname}
% The next code chunk is based on code posted to the \texttt{ctt} newsgroup
% by Heiko Oberdiek (\texttt{oberdiek@ruf.uni-freiburg.de}) on 18~April 2000.
% The code, by some miraculous means, sets up a keyed class option.
%    \begin{macrocode}
\define@key{COLCLASS}{colclass}[article]%
           {\renewcommand{\c@lclass}{#1}
            \ClassWarningNoLine{combine}
                               {Expect warnings like:\MessageBreak
            \space\space LaTeX Warning: Unused global option(s):\MessageBreak
            \space\space\space\space [colclass=#1]}}
\let\c@l@tempa\@empty
\def\c@l@getoptionname#1=#2\@nil{#1}
\@for\CurrentOption:=\@classoptionslist\do{%
  \@ifundefined{%
    KV@COLCLASS@\expandafter\c@l@getoptionname\CurrentOption=\@nil
  }%
  {%  other options
  }{%
    \edef\c@l@tempa{\c@l@tempa,\CurrentOption,}%
  }%
}%
\edef\c@l@tempa{%
  \noexpand\setkeys{COLCLASS}{\c@l@tempa}%
}
\c@l@tempa

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
%    The following |\if...| commands are for implementing various options.
% \changes{v0.4}{2000/05/27}{Unnested some macro environments to save save stack space}
% \begin{macro}{\ifc@lclasses}
%    \begin{macrocode}
\newif\ifc@lclasses
  \c@lclassesfalse
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\ifc@lpackages}
%    \begin{macrocode}
\newif\ifc@lpackages
  \c@lpackagesfalse
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\ifc@llayouts}
%    \begin{macrocode}
\newif\ifc@llayouts
  \c@llayoutsfalse
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\ifc@lfolios}
%    \begin{macrocode}
\newif\ifc@lfolios
  \c@lfoliosfalse
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\ifc@lnotoc}
%    \begin{macrocode}
\newif\ifc@lnotoc
  \c@lnotocfalse
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\ifc@lnolof}
%    \begin{macrocode}
\newif\ifc@lnolof
  \c@lnoloffalse
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\ifc@lnolot}
%    \begin{macrocode}
\newif\ifc@lnolot
  \c@lnolotfalse
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\ifc@lmaintoc}
%    \begin{macrocode}
\newif\ifc@lmaintoc
  \c@lmaintocfalse
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\ifc@lnodate}
%    \begin{macrocode}
\newif\ifc@lnodate
  \c@lnodatetrue
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\ifc@lnoauthor}
%    \begin{macrocode}
\newif\ifc@lnoauthor
  \c@lnoauthorfalse
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\ifc@lnotitle}
%    \begin{macrocode}
\newif\ifc@lnotitle
  \c@lnotitlefalse
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\ifc@lnomaketitle}
%    \begin{macrocode}
\newif\ifc@lnomaketitle
  \c@lnomaketitlefalse
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\ifc@lnopubindoc}
% \changes{v0.4}{2000/05/27}{Added nopubindoc and nopubintoc options}
%    \begin{macrocode}
\newif\ifc@lnopubindoc
  \c@lnopubindocfalse
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\ifc@lnopubintoc}
%    \begin{macrocode}
\newif\ifc@lnopubintoc
  \c@lnopubintocfalse
%    \end{macrocode}
% \end{macro}
% \changes{v0.5}{2002/08/24}{Added onebib and combinedbib options}
% \begin{macro}{\ifc@lonebib}
%    \begin{macrocode}
\newif\ifc@lonebib
  \c@lonebibfalse
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\ifc@lcombib}
%    \begin{macrocode}
\newif\ifc@lcombib
  \c@lcombibfalse
%    \end{macrocode}
% \end{macro}
%
%
% Now declare and process the options.
% \changes{v0.4}{2000/05/27}{Added book option}
% \changes{v0.6}{2002/08/24}{Added onebib option}
% \changes{v0.63}{2003/11/09}{Added memoir option}
%    \begin{macrocode}

\DeclareOption{book}{\def\c@lclass{book}}
\DeclareOption{report}{\def\c@lclass{report}}
\DeclareOption{letter}{\def\c@lclass{letter}}
\DeclareOption{memoir}{\def\c@lclass{memoir}}
\DeclareOption{classes}{\c@lclassestrue}
\DeclareOption{packages}{\c@lpackagestrue}
\DeclareOption{layouts}{\c@llayoutstrue}
\DeclareOption{folios}{\c@lfoliostrue}
\DeclareOption{notoc}{\c@lnotoctrue}
\DeclareOption{nolof}{\c@lnoloftrue}
\DeclareOption{nolot}{\c@lnolottrue}
\DeclareOption{maintoc}{\c@lmaintoctrue}
\DeclareOption{date}{\c@lnodatefalse}
\DeclareOption{noauthor}{\c@lnoauthortrue}
\DeclareOption{notitle}{\c@lnotitletrue}
\DeclareOption{nomaketitle}{\c@lnomaketitletrue}
\DeclareOption{nopubindoc}{\c@lnopubindoctrue}
\DeclareOption{nopubintoc}{\c@lnopubintoctrue}
\DeclareOption{onebib}{\c@lonebibtrue}
\DeclareOption{combinedbib}{\c@lcombibtrue}
\DeclareOption*{\PassOptionsToClass{\CurrentOption}{\c@lclass}}
\ProcessOptions\relax
\ifc@lcombib
  \c@lonebibtrue
\fi

%    \end{macrocode}
% 
%
%    At this point, load the actual class (as specified by |\c@lclass|).
%    \begin{macrocode}
\LoadClass{\c@lclass}

%    \end{macrocode}
%
% \begin{macro}{\ifc@lhaschapter}
%    |\ifc@lhaschapter| is TRUE if the loaded class has chapters.
%    \begin{macrocode}
\newif\ifc@lhaschapter
  \c@lhaschapterfalse
\@ifundefined{chapter}{}{\c@lhaschaptertrue}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\if@titlepage}
%    The \Lpack{letter} class (and perhaps others) does not have a 
% |\maketitle| command, and therefor neither has a \Lopt{titlepage} option.
% In this case we need a new |\if@titlepage| for later use when dealing
% with |\maketitle|. A side effect of this implementation is that |\maketitle|
% is available for any main document class.
% \changes{v0.3}{2000/05/20}{Ensured \cs{if@titlepage} is defined}
%    \begin{macrocode}
\@ifundefined{if@titlepage}{\newif\if@titlepage\@titlepagefalse}{}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ifc@ltoctitle}
% \begin{macro}{\ifc@ltoctitle}
% \begin{macro}{\ifc@lpub}
%    Boolean hooks for testing if |\coltoctitle|, |\coltocauthor| and
% |\published| have been set.
%    \begin{macrocode}
\newif\ifc@ltoctitle
  \c@ltoctitlefalse
\newif\ifc@ltocauthor
  \c@ltocauthorfalse
\newif\ifc@lpub
  \c@lpubfalse

%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{colpage}
% \begin{macro}{c@lctr}
% \begin{macro}{\c@section}
% |colpage| is a counter for storing the (current) page number for the
% main document.
% |c@lctr| is a counter for storing the current main document sectioning
% number. A section counter (|\c@section|) is provided when the class 
% does not have sections.
%    \begin{macrocode}
\newcounter{colpage} \setcounter{colpage}{1}
  \renewcommand{\thecolpage}{\arabic{colpage}}
\newcounter{c@lctr}
\@ifundefined{c@section}{\newcounter{section}}{}

%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\c@ltocfnum}
% \begin{macro}{\c@lloffnum}
% \begin{macro}{\c@llotfnum}
%    These are output stream numbers for local ToC, LoF and LoT files.
% Allocating new streams for each imported file may cause \TeX{} to
% run out of streams (there is a limit of 16).
%    \begin{macrocode}
\newwrite\c@ltocfnum
\newwrite\c@lloffnum
\newwrite\c@llotfnum

%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% 
% \section{Kernel modifications (and potential additions)}
%
%    Much of the class code consists of new versions of \LaTeX{} kernel commands.
% Redefinitions starting with |\c@la...| are for commands in the main
% document. Modifications starting |\c@lb...| are for commands within
% imported documents.
%
%
% \begin{macro}{\provideenvironment}
% \begin{macro}{\c@lprovide@environment}
% \begin{macro}{\c@lenvironment}
% \begin{macro}{\c@lenva}
% \begin{macro}{\c@lenvb}
% \begin{macro}{\c@lthrowenv}
%     To stop \LaTeX{} whining when multiple classes are read which happen
% to define commands (via |\newcommand|) or environments 
% (via |\newenvironment|) that have the same names, we need to be able
% to make \LaTeX{} use |\providecommand| and |\provideenvironment|
% instead. Unfortunately the kernel does not provide a |\provideenvironment|
% command, so here is one based on the code in the \Lpack{makecmds} package.
%    \begin{macrocode}
\def\provideenvironment{%
  \@star@or@long\c@lprovide@environment}
\def\c@lprovide@environment#1{%
  \@ifundefined{#1}{%
    \expandafter\let\csname#1\endcsname\relax
    \expandafter\let\csname end#1\endcsname\relax
    \new@environment{#1}}{\c@lenvironment{#1}}
}
\def\c@lenvironment#1{%
  \@testopt{\c@lenva#1}0}
\def\c@lenva#1[#2]{%
  \@ifnextchar [{\c@lenvb#1[#2]}{\c@lthrowenv{#1}{[#2]}}}
\def\c@lenvb#1[#2][#3]{\c@lthrowenv{#1}{[#2][#3]}}
\def\c@lthrowenv#1#2#3#4{}

%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\c@lnamethm}
% \begin{macro}{\@xnthm}
% \begin{macro}{\@ynthm}
% \begin{macro}{\@othm}
%  As pointed out by Hendri Hondrop\footnote{Email 
% from \texttt{hendri@cs.utwente.nl} on 16~May, 2000.}
% |\newtheorem| commands in imported documents can interfere with each other.
% My solution to this is to make the command local instead of global.
% |\c@lnamethm| is a helper macro (removes the |\global| from the 
% |\@namedef|s in the original code), and the others are modifications
% of the originals in \file{ltthm.dtx} (just removing any |\global| commands).
% \changes{v0.3}{2000/05/20}{Added a local version of \cs{newtheorem}.}
%    \begin{macrocode}
\@ifundefined{newtheorem}{}{%
  \newcommand{\c@lnamethm}[3]{%
    \@namedef{#1}{\@thm{#2}{#3}}%
    \@namedef{end#1}{\@endtheorem}}
  \def\@xnthm#1#2[#3]{%
    \expandafter\@ifdefinable\csname #1\endcsname
      {\@definecounter{#1}\@newctr{#1}[#3]%
       \expandafter\xdef\csname the#1\endcsname{%
         \expandafter\noexpand\csname the#3\endcsname \@thmcountersep
           \@thmcounter{#1}}%
       \c@lnamethm{#1}{#1}{#2}}}
  \def\@ynthm#1#2{%
    \expandafter\@ifdefinable\csname #1\endcsname
      {\@definecounter{#1}%
       \expandafter\xdef\csname the#1\endcsname{\@thmcounter{#1}}%
       \c@lnamethm{#1}{#1}{#2}}}
  \def\@othm#1[#2]#3{%
    \@ifundefined{c@#2}{\@nocounterr{#2}}%
      {\expandafter\@ifdefinable\csname #1\endcsname
       {\@namedef{the#1}{\@nameuse{the#2}}
       \c@lnamethm{#1}{#2}{#3}}}}
}

%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\providelength}
%  This is a |\provide...| version of |\newlength| (from \file{ltlength.dtx}).
% \changes{v0.4}{2000/05/27}{Added \cs{providelength} and \cs{providecounter}
%  commands}
% \changes{v0.63}{2003/11/09}{Used \cs{providecommand} for \cs{providelength}
%          and \cs{providecounter} as they are defined in the memoir class}
%    \begin{macrocode}
\providecommand{\providelength}[1]{%
  \ifx #1\undefined
    \newlength{#1}
  \fi
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\providecounter}
%  This is a |\provide...| version of |\newcounter| (from \file{ltcounts.dtx}).
%    \begin{macrocode}
\providecommand{\providecounter}[1]{%
  \expandafter\ifx \csname c@#1\endcsname \undefined
    {\@definecounter{#1}}%
    \@ifnextchar[{\@newctr{#1}}{}
  \else
    \@ifnextchar[{\c@l@gobbleoptarg}{}
  \fi
}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@l@gobbleoptarg}
%    A macro that discards an optional argument (i.e., the tokens |[optarg]|).
% \changes{v0.4}{2000/05/27}{Added \cs{c@l@gobbleoptarg} command}
%    \begin{macrocode}
\def\c@l@gobbleoptarg[#1]{}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\appendiargdef}
%    The code for this is copied from the \Lpack{abstract} package, hence
% the use of |@bs| instead of |c@l| as a distinguishing substring.
% \changes{v0.41}{2000/06/18}{Added \cs{appendiargdef} from the abstract package}
%    \begin{macrocode}
\providecommand{\appendiargdef}[2]{\begingroup
  \toks@\expandafter{#1{##1}#2}%
  \edef\@bsx{\endgroup \def\noexpand#1####1{\the\toks@}}%
  \@bsx}

%    \end{macrocode}
% \end{macro}
%
%
% \subsection{Document commands and environments}
%
% \begin{macro}{\c@lbdocumentclass}
% The |\documentclass| in imported documents has to be changed so that
% commands including the |@| sign are legal in the preamble. By default
% the declared options and class are discarded. When the \Lopt{classes}
% option is used, any potential new class file must be read.
% |\documentclass|
% is originally defined in \file{ltclass.dtx}.
%    \begin{macrocode}
\ifc@lclasses
  \newcommand\c@lbdocumentclass{%
    \makeatletter                           %% added
    \let\newcommand\providecommand          %% added
    \let\newenvironment\provideenvironment  %% added
%%    \let\documentclass\@twoclasseserror
%%    \if@compatability\else\let\usepackage\RequirePackage\fi
    \@fileswithoptions\@clsextension
  }
\else
  \newcommand{\c@lbdocumentclass}[2][\@empty]{%
    \makeatletter
  }
\fi

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@lbusepackage}
% The |\usepackage| command (from \file{ltclass.dtx}) 
% in imported documents is normally disabled.
% This is the disabled version.
%    \begin{macrocode}
\ifc@lpackages\else
  \newcommand{\c@lbusepackage}[2][\@empty]{}
\fi

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@lbLoadClass}
% This is a copy of the |\LoadClass| from \file{ltclass.dtx}. I found it was
% needed if an imported document used a class that in its turn used
% |\LoadClass|.\footnote{Problem reported by Hans Fredrik Nordhaug
% \texttt{hansfn@mi.uib.no} on 2001/08/24.}
% \changes{v0.52}{2001/08/25}{Added \cs{c@lbLoadClass}}
%    \begin{macrocode}
\newcommand{\c@lbLoadClass}{%
  \ifx\@currext\@pkgextension
    \@latex@error{\noexpand\LoadClass in package file}%
      {You may only use \noexpand\LoadClass in a class file.}%
  \fi
  \@fileswithoptions\@clsextension}

%    \end{macrocode}
% \end{macro}
%
% The |\document| command (defined in \file{ltfiles.dtx}) has to be modified,
% both for the main document (to allow later preamble commands and to
% store the jobname of the main document), and similarly but not identically,
% for the imported documents (output here is to the |\@partaux| file instead
% of the |\@mainaux| file).
%
% \begin{macro}{\c@ltextblock}
% |\c@ltextblock| is a macro holding some code that is common to both
% |\c@ladocument| and |\c@lbdocument|.
% \changes{v0.3}{2000/05/20}{Added \cs{c@ltextblock} command}
%    \begin{macrocode}
\newcommand{\c@ltextblock}{%
  \@colht\textheight
  \@colroom\textheight \vsize\textheight
  \columnwidth\textwidth
  \@clubpenalty\clubpenalty
  \if@twocolumn
    \advance\columnwidth -\columnsep
    \divide\columnwidth\tw@ \hsize\columnwidth \@firstcolumntrue
  \fi
  \hsize\columnwidth \linewidth\hsize
}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@ladocument}
% \begin{macro}{\c@lbdocument}
%    \begin{macrocode}
\newcommand{\c@ladocument}{%
  \endgroup
  \let\mainjobname\jobname            %% added
  \def\c@lmainauxfile{\jobname.aux}   %% added
  \ifx\@unusedoptionlist\@empty\else
    \@latex@warning@no@line{Unused global option(s):^^J%
           \@spaces[\@unusedoptionlist]}%
  \fi
  \c@ltextblock                       %% a replacement
  \begingroup\@floatplacement\@dblfloatplacement
    \makeatletter\let\@writefile\@gobbletwo
    \global \let \@multiplelabels \relax
    \@input{\c@lmainauxfile}%                   %% changed
  \endgroup
  \if@filesw
    \immediate\openout\@mainaux\c@lmainauxfile  %% changed
    \immediate\write\@mainaux{\relax}%
  \fi
  \process@table
  \let\glb@currsize\@empty
  \normalsize
  \everypar{}%
  \ifx\normalsfcodes\@empty
    \ifnum\sfcode`\.=\@m
      \let\normalsfcodes\frenchspacing
    \else
      \let\normalsfcodes\nonfrenchspacing
    \fi
  \fi
  \@noskipsecfalse
%    \end{macrocode}
% \begin{macro}{\@outputpage}
%    Imported documents may change the page number, which can then mess
% up the numbering of later pages. The |colpage| counter is used
% to synchronize the main document page numbering after any import.
% To do this, it has to be incremented for each typeset page, so
% this is added to the output routine (described in \file{ltoutput.dtx}).
% This is done here in case any package in the main document has modified
% |\@outputpage|, as the \Lpack{showframe} package does.
% \changes{v0.4}{2000/05/27}{Moved the modification to \cs{@outputpage}
% to within \cs{c@ladocument}}
%
% Similarly, the |\maketitle| command is made to be |\@clamaketitle| in case
% some other package (e.g., \Lpack{titling}) has modified |\maketitle| after
% the \Lpack{combine} class has done its thing.
% \changes{v0.41}{2000/06/18}{Moved \cs{maketitle} letting to 
% \cs{c@lamaketitle} to inside \cs{c@ladocument}}
%    \begin{macrocode}
  \g@addto@macro{\@outputpage}{\stepcounter{colpage}}  %% added
  \let\maketitle\c@lamaketitle                         %% added
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\c@lthechap}
% \begin{macro}{\c@lthesec}
% Store the initial forms of |\thechapter| or |\thesection| for later
% restoration after a possible |\appendix|.
% \changes{v0.51}{2001/07/05}{Added \cs{c@lthechap} and \cs{c@lthesec}}
%    \begin{macrocode}
  \@ifundefined{c@chapter}%            %% added
    {\@ifundefined{c@section}{}{\let\c@lthesec\thesection}}%
    {\let\c@lthechap\thechapter}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
%    \begin{macrocode}
  \let \@refundefined \relax
  \let\AtBeginDocument\@firstofone
  \@begindocumenthook
  \ifdim\topskip<1sp\global\topskip 1sp\relax\fi
  \global\@maxdepth\maxdepth
%%  \global\let\@begindocumenthook\@undefined
  \ifx\@listfiles\@undefined
    \global\let\@filelist\relax
    \global\let\@addtofilelist\@gobble
  \fi
%%  \gdef\do##1{\global\let ##1\@notprerr}%
%%  \@preamblecmds
  \global\let \@nodocument \relax
  \global\let\do\noexpand
  \ignorespaces}

%    \end{macrocode}
%    For an imported document the \Lopt{layouts} option is implemented
% in the |\document| command. The \Lpack{article},
% \Lpack{report} and \Lpack{letter} classes all start of with the |plain|
% page style, which is specified within the class file. When mixed classes
% of imported documents are used the page style definitions can get 
% overwritten by the extra class(es). So, the revised |\document| command
% resets the |plain| page style to the \Lpack{combine} class definition
% and sets the initial page style to be |plain|.
%    \begin{macrocode}
\newcommand{\c@lbdocument}{%
%%  \endgroup
%%  \ifx\@unusedoptionlist\@empty\else
%%    \@latex@warning@no@line{Unused global option(s):^^J%
%%           \@spaces[\@unusedoptionlist]}%
%%  \fi
  \ifc@llayouts            %% layouts option
    \c@ltextblock
  \fi
  \begingroup\@floatplacement\@dblfloatplacement
    \makeatletter \let\@writefile\@gobbletwo
%%    \global \let \@multiplelabels \relax
    \@input{\c@lauxfile}%
  \endgroup
  \if@filesw
    \immediate\openout\@partaux\c@lauxfile 
    \immediate\write\@partaux{\relax}%
  \fi
  \process@table
  \let\glb@currsize\@empty
  \normalsize
  \everypar{}%
  \@noskipsecfalse
%%  \let \@refundefined \relax
  \let\AtBeginDocument\@firstofone
  \@begindocumenthook
  \ifdim\topskip<1sp\global\topskip 1sp\relax\fi
  \global\@maxdepth\maxdepth
%%  \global\let\@begindocumenthook\@undefined
  \ifx\@listfiles\@undefined
    \global\let\@filelist\relax
    \global\let\@addtofilelist\@gobble
  \fi
%%  \gdef\do##1{\global\let ##1\@notprerr}%
%%  \@preamblecmds
  \global\let \@nodocument \relax
  \global\let\do\noexpand
  \let\ps@plain\c@lbps@plain   %% set pagestyle
%    \end{macrocode}
% Setting |\pagestyle| here kills the use of any other style (e.g.,
% a fancy style) in the imports\footnote{Problem discovered by Rumen
% Bogdanovski (\texttt{rgb@libra.astro.bas.bg}) on 2001/04/03.}.
% \changes{v0.41}{2001/04/04}{Eliminated page style setting for imports.}
%    \begin{macrocode}
%%  \pagestyle{plain}    
  \ifc@lfolios                 %% folios option initialises page number
    \setcounter{page}{1}        
  \fi
  \ifc@lhaschapter             %% set chapter/section number
    \setcounter{c@lctr}{\value{chapter}}
    \setcounter{chapter}{0}
  \else
    \setcounter{c@lctr}{\value{section}}
    \setcounter{section}{0}
  \fi
  \c@lresetcounters            %% added
  \makeatother                 %% added
  \ignorespaces}

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\c@lresetcounters}
%    This sets various counters to zero, and is called at the beginning of
% an imported document.
% \changes{v0.4}{2000/05/27}{Added \cs{c@lresetcounters} and 
% \cs{zeroextracounters} commands}
% \changes{v0.51}{2001/07/05}{Reset chapter/section format after possible \cs{appendix}}
%    \begin{macrocode}
\newcommand{\c@lresetcounters}{%
  \@ifundefined{c@figure}{}{\setcounter{figure}{0}}
  \@ifundefined{c@table}{}{\setcounter{table}{0}}
  \@ifundefined{c@equation}{}{\setcounter{equation}{0}}
  \@ifundefined{c@footnote}{}{\setcounter{footnote}{0}}
  \@ifundefined{c@chapter}%
    {\@ifundefined{c@section}{}{\renewcommand{\thesection}{\c@lthesec}}}%
    {\renewcommand{\thechapter}{\c@lthechap}}
  \zeroextracounters
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\zeroextracounters}
%    This is a user-level macro that can be renewed to reset addtional
% counters to zero at the beginning of an imported document.
%    \begin{macrocode}
\newcommand{\zeroextracounters}{}

%    \end{macrocode}
% \end{macro}
%
% 
%
%  The |\enddocument| command (defined in \file{ltmiscen.dtx}) has
% to be modified for both the main and imported documents. The modifications
% are minor, mainly concerned with handling the proper files.
%
% \begin{macro}{\c@lenddoca}
% |\c@lenddoca| holds some code that is common to both |\c@laenddocument|
% and |\c@lbenddocument|.
% \changes{v0.3}{2000/05/20}{Added \cs{c@lenddoca} command}
%    \begin{macrocode}
\newcommand{\c@lenddoca}{%
    \@dofilelist
    \ifdim \font@submax >\fontsubfuzz\relax
      \@font@warning{Size substitutions with differences\MessageBreak
                 up to \font@submax\space have occured.\@gobbletwo}%
    \fi
    \@defaultsubs
%%    \@refundefined
    \if@filesw
      \ifx \@multiplelabels \relax
        \if@tempswa
          \@latex@warning@no@line{Label(s) may have changed.
              Rerun to get cross-references right}%
        \fi
      \else
        \@multiplelabels
      \fi
    \fi
}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@laenddocument}
% \begin{macro}{\c@lbenddocument}
%    \begin{macrocode}
\newcommand{\c@laenddocument}{%
  \@enddocumenthook
  \@checkend{document}%
  \clearpage
  \begingroup
    \if@filesw
      \immediate\closeout\@mainaux 
      \immediate\closeout\@partaux 
      \let\@setckpt\@gobbletwo
      \let\@newl@bel\@testdef
      \@tempswafalse
      \makeatletter \input\c@lmainauxfile  %% change here
    \fi
    \c@lenddoca                            %% a replacement
    \@refundefined
  \endgroup
  \deadcycles\z@\@@end}

\newcommand{\c@lbenddocument}{%
  \@enddocumenthook
  \@checkend{document}%
  \clearpage
  \begingroup
    \if@filesw
      \immediate\closeout\@partaux   %% change here
      \let\@setckpt\@gobbletwo
      \let\@newl@bel\@testdef
      \@tempswafalse
      \makeatletter \input\c@lauxfile  %% change here
    \fi
    \c@lenddoca                        %% a replacement
%%    \@refundefined
  \endgroup
  \deadcycles\z@  %%\@@end     %% \@@end will close *all* files
  \c@lclosetocs                %% close local files
%    \end{macrocode}
% Reset sectional and page numbering. Also reset stuff to take account
% of the possibily that |\appendix| was called.
% \changes{v0.51}{2001/05/09}{Added reset of chapter name after appendix}
%    \begin{macrocode}
  \ifc@lhaschapter             %% reset chap/sec and page numbering
    \setcounter{chapter}{\value{c@lctr}}
    \gdef\thechapter{\c@lthechap}
    \gdef\@chapapp{\chaptername}
  \else
    \setcounter{section}{\value{c@lctr}}
    \gdef\thesection{\c@lthesec}
  \fi
  \setcounter{page}{\value{colpage}}
  \pagestyle{\c@lastyle}
  \erasetitling                %% no \coltoc... or \published commands defined
%%  \let\@auxout\@mainaux
  \gdef\jobname{\mainjobname}  %% swap back to main document file name
  \endinput                    %% ignore any text after \end{document}
}

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsection{Titling commands}
%
%    Changes to |\maketitle| and friends are defined here.
%
% \begin{macro}{\maintitlefont}
% \begin{macro}{\postmaintitle}
% \begin{macro}{\mainauthorfont}
% \begin{macro}{\postmainauthor}
% \begin{macro}{\maindatefont}
% \begin{macro}{\postmaindate}
%    To provide some flexibilty in the titling style of the main document,
% user level commands are provided that can be changed to reconfigure
% the appearance resulting from |\maketitle|. These are defined initially
% to approximately mimic the normal \LaTeX{} style.
% \changes{v0.3}{2000/05/20}{Added \cs{...main...} commands.}
%    \begin{macrocode}
\newcommand{\maintitlefont}{\begin{center}\LARGE}
\newcommand{\postmaintitle}{\par\end{center}\vskip 0.5em}
\newcommand{\mainauthorfont}{\begin{center}
  \large \lineskip .5em%
  \begin{tabular}[t]{c}}
\newcommand{\postmainauthor}{\end{tabular}\par\end{center}}
\newcommand{\maindatefont}{\begin{center}\large}
\newcommand{\postmaindate}{\par\end{center}}

%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\c@lamaketitle}
%    The |\maketitle| command (defined by each class) must not incapacitate
% several commands that it normally does (e.g., |\thanks|, |\maketitle|,
% |\title|, |\author|, |\date|, and |\and|). The following is a
% modification of |\maketitle| as in the \Lpack{article}, \Lpack{report},
% and \Lpack{book} classes.
% \changes{v0.3}{2000/05/20}{Revised maketitle-related commands.}
%    \begin{macrocode}
\if@titlepage
  \newcommand{\c@lamaketitle}{\begin{titlepage}%
    \let\footnotesize\small
    \let\footnoterule\relax
    \let \footnote \thanks
    \null\vfil
    \vskip 60\p@
    {\maintitlefont \@title \postmaintitle}
    {\mainauthorfont \@author \postmainauthor}
    {\maindatefont \@date \postmaindate}
    \par
    \@thanks
    \vfil\null
    \end{titlepage}%
    \setcounter{footnote}{0}%
    \c@lmtitlempty                %% change here
  } % end titlepage defs
\else
  \newcommand{\c@lamaketitle}{\par
    \begingroup
      \c@lmtitle                   %% change here
    \endgroup
    \setcounter{footnote}{0}%
    \c@lmtitlempty                 %% change here
  } % end non-titlepage

%    \end{macrocode}
% I use |\def\@maketitle| to account for the cases where the main class 
% does not have titling commands, and to ensure an existing |\@maketitle|
% gets overridden.
%    \begin{macrocode}

  \def\@maketitle{%               
    \newpage
    \null
    \vskip 2em%
    {\maintitlefont \@title \postmaintitle}
    {\mainauthorfont \@author \postmainauthor}
    {\maindatefont \@date \postmaindate}
    \par
    \vskip 1.5em}
\fi    % end mod A of titling

%    \end{macrocode}
%
% \begin{macro}{\c@lmtitle}
%    This macro contains much of the code that is common between
% |\c@l@maketitle| and |\c@lbmaketitle|.
%    \begin{macrocode}
\newcommand{\c@lmtitle}{%
  \renewcommand\thefootnote{\@fnsymbol\c@footnote}%
  \def\@makefnmark{\rlap{\@textsuperscript{\normalfont\@thefnmark}}}%
  \long\def\@makefntext##1{\parindent 1em\noindent
    \hb@xt@1.8em{%
      \hss\@textsuperscript{\normalfont\@thefnmark}}##1}%
  \if@twocolumn
    \ifnum \col@number=\@ne
      \@maketitle
    \else
      \twocolumn[\@maketitle]%
    \fi
  \else
    \newpage
    \global\@topnum\z@
    \@maketitle
  \fi
  \thispagestyle{plain}\@thanks
}

%    \end{macrocode}
% \end{macro}
%
% The modification for imported documents is simpler as there seems no
% point in allowing for a \Lopt{titlepage} option. Also, don't start
% a new page for the title and use a local typesetting style.
%    \begin{macrocode}
  \newcommand{\c@lbmaketitle}{\par
    \begingroup
      \let\newpage\relax
      \let\@maketitle\c@lb@maketitle
      \c@lmtitle
    \endgroup
    \setcounter{footnote}{0}%
    \c@lmtitlempty
  } 

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@lmtitlempty}
%    A helper macro to save some macro space. 
% It empties elements of |\maketitle|.
%    \begin{macrocode}
\newcommand{\c@lmtitlempty}{%
  \global\let\@thanks\@empty
  \global\let\@author\@empty
  \global\let\@date\@empty
  \global\let\@title\@empty
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\importtitlefont}
% \begin{macro}{\postimporttitle}
% \begin{macro}{\importauthorfont}
% \begin{macro}{\postimportauthor}
% \begin{macro}{\importdatefont}
% \begin{macro}{\postimportdate}
%    The fonts and layouts for use within |\maketitle| in imported documents.
% \changes{v0.3}{2000/05/20}{Added \cs{...import...} commands.}
%    \begin{macrocode}
\newcommand{\importtitlefont}{\begin{center}\LARGE\bfseries}
\newcommand{\postimporttitle}{\par\end{center}}
\newcommand{\importauthorfont}{\begin{center}
  \large\itshape \lineskip .5em%
  \begin{tabular}[t]{c}}
\newcommand{\postimportauthor}{\end{tabular}\par\end{center}}
\newcommand{\importdatefont}{\begin{center}\large}
\newcommand{\postimportdate}{\par\end{center}}

%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\c@lb@maketitle}
% This typesets the title in an imported document. It also includes the
% code for implementing the \Lopt{nodate}, \Lopt{notitle} and \Lopt{noauthor}
% options. The vertical spacing is reduced slightly from normal. 
% The title and author texts are set with |\importtitlefont| and
% |\importauthorfont| respectiveley. The date is set with |\importdatefont|.
%    \begin{macrocode}
\newcommand{\c@lb@maketitle}{%
%%  \newpage
  \begingroup
    \let\footnote\thanks
    \null
    \vskip 2em%
    \ifc@lnotitle\else
      {\importtitlefont \@title \postimporttitle}
    \fi
    \ifc@lnoauthor\else
      {\importauthorfont \@author \postimportauthor}
    \fi
    \ifc@lnodate\else
      {\importdatefont \@date \postimportdate}%
    \fi
    \par
  \endgroup
}

%    \end{macrocode}
% \end{macro}
%
% \subsection{Cross referencing}
%
%    This section deals with |\tableofcontents| and friends, together
% with labeling, referencing and citations.
%
% \begin{macro}{\c@lbstarttoc}
% The |\@starttoc| command (from \file{ltsect.dtx}) has to be modified
% for imported documents so that a local ToC (LoF, LoT) file is used
% instead of the one for the main document. I use a file identifier
% of |c@l#1fnum| instead of the normal |tf@#1|.
%    \begin{macrocode}
\newcommand{\c@lb@starttoc}[1]{%
  \begingroup
    \makeatletter
    \def\tocfname{\jobname.#1}
    \@input{\tocfname}%
    \if@filesw
%    \end{macrocode}
% The following tests are to check if we can use a predefined output stream
% or have to allocate a new one (e.g., if a new list of floats hase been
% defined).
%    \begin{macrocode}
      \def\c@ltempa{#1} \def\c@ltempb{toc}
      \ifx \c@ltempa \c@ltempb
         \immediate\openout\c@ltocfnum \tocfname\relax
      \else
        \def\c@ltempb{lof}
        \ifx \c@tempa \c@ltempb
          \immediate\openout\c@lloffnum \tocfname\relax
        \else
          \def\c@ltempb{lot}
          \ifx \c@tempa \c@ltempb
            \immediate\openout\c@llotfnum \tocfname\relax
          \else
            \expandafter\newwrite\csname c@l#1fnum\endcsname
            \immediate\openout\csname c@l#1fnum\endcsname \tocfname\relax
          \fi
        \fi
      \fi
    \fi
    \@nobreakfalse
  \endgroup}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@lbwritefile}
% To go along with local ToC files, |\@writefile| (in \file{ltmiscen.dtx})
% has to be modified to match. We also check if a local file exists before
% writing to it. 
%    \begin{macrocode}
\newcommand{\c@lb@writefile}[2]{%
  \def\tocfname{\jobname.#1}
  \IfFileExists{\tocfname}
    {\@temptokena{#2}%
     \immediate\write\csname c@l#1fnum\endcsname{\the\@temptokena}}
    {}
}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@lclosetocs}
% At the end of each imported document, any local ToC, etc., files 
% must be closed.
%    \begin{macrocode}
\newcommand{\c@lclosetocs}{%
  \immediate\closeout\c@ltocfnum
  \immediate\closeout\c@lloffnum
  \immediate\closeout\c@llotfnum
}

%    \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\c@ltocgobble}
%    A macro containing some common code for |\...addtocontents| commands.
%    \begin{macrocode}
\newcommand{\c@ltocgobble}{%
  \let\label\@gobble \let\index\@gobble \let\glossary\@gobble}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@laaddtocontents}
% \begin{macro}{\c@laaddcontentsline}
%    It turns out to be useful to have versions of ToC addition commands
% that go towards the main document.
%    \begin{macrocode}
\newcommand{\c@laaddtocontents}[2]{%
  \protected@write\@mainaux
    {\c@ltocgobble}%
    {\string\@writefile{#1}{#2}}
}
\newcommand{\c@laaddcontentsline}[3]{%
  \c@laaddtocontents{#1}{\protect\contentsline{#2}{#3}{\thecolpage}}
}

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\c@lbaddtocontents}
% To implement the \Lopt{maintoc} option, we need a modification of
% |\addtocontents| (in \file{ltsect.dtx}) so that it will write to 
% both the local and the main \file{.aux} files.
%    \begin{macrocode}
\ifc@lmaintoc
  \newcommand{\c@lbaddtocontents}[2]{%
    \protected@write\@auxout
      {\c@ltocgobble}%
      {\string\@writefile{#1}{#2}}
    \ifx\@mainaux\@auxout\else    %% prevent writing twice to mainaux
      \protected@write\@mainaux
        {\c@ltocgobble}%
        {\string\@writefile{#1}{\protect\begin{tocindent}{\toctocindent}}}
      \protected@write\@mainaux
        {\c@ltocgobble}%
        {\string\@writefile{#1}{#2}}
      \protected@write\@mainaux
        {\c@ltocgobble}%
        {\string\@writefile{#1}{\protect\end{tocindent}}}
    \fi
  }
\fi

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@lblabel}
% \begin{macro}{\c@lb@setref}
%    To get the `correct' page number for labels in an imported
% document, we have to use the global and not the local page number.
%    \begin{macrocode}
\newcommand{\c@lblabel}[1]{\@bsphack
  \protected@write\@auxout{}%
    {\string\newlabel{#1}{{\@currentlabel}{\thecolpage}}}%
  \@esphack}
\newcommand{\c@lb@setref}[3]{%
  \ifx#1\relax
    \protect\G@refundefinedtrue
    \nfss@text{\reset@font\bfseries ??}%
    \@latex@warning{Reference `#3' on page \thecolpage \space
                    undefined}%
  \else
    \expandafter#2#1\null
  \fi}

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\c@lbnewlabel}
% \begin{macro}{\c@lbref}
% \begin{macro}{\c@lpagebref}
%  For local labels and cross-references in an imported document, 
% special versions of 
% |\newlabel|, |\ref| and |\pageref| (in \file{ltxref.dtx}) are needed.
% I use |\jobname| to distinguish identical labels in different imported
% files.
%    \begin{macrocode}
\newcommand{\c@lbnewlabel}{\@newl@bel{R?\jobname?}}
\newcommand{\c@lbref}[1]{\expandafter\@setref\csname R?\jobname?@#1\endcsname
               \@firstoftwo{#1}}
\newcommand{\c@lbpageref}[1]{\expandafter\@setref\csname R?\jobname?@#1\endcsname
               \@secondoftwo{#1}}

%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\c@lwritemainbib}
% \begin{macro}{\c@lwritelocalbib}
% For citatations we may be writing to either the main bibliography
% or to a local bibliography. For local bibliographies I use the
% |\jobname| as a distinguishing characteristic.
% \changes{v0.6}{2002/08/24}{Added \cs{c@lwritemainbib} and \cs{c@lwritelocalbib}}
%    \begin{macrocode}
\newcommand{\c@lwritemainbib}{%
     \if@filesw\immediate\write\@mainaux{\string\citation{\@citeb}}\fi
     \@ifundefined{b@\@citeb}{\mbox{\reset@font\bfseries ?}%
      \G@refundefinedtrue
      \@latex@warning
        {Citation `\@citeb' on page \thecolpage \space undefined}}%
      {\hbox{\csname b@\@citeb\endcsname}}}
\newcommand{\c@lwritelocalbib}{%
     \if@filesw\immediate\write\@auxout{\string\citation{\@citeb}}\fi
     \@ifundefined{B?\jobname?@\@citeb}{\mbox{\reset@font\bfseries ?}%
      \G@refundefinedtrue
      \@latex@warning
        {Citation `\@citeb' on page \thecolpage \space undefined}}%
      {\hbox{\csname B?\jobname?@\@citeb\endcsname}}}

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
%
% \begin{macro}{\c@lanocite}
%  Slight mod to the kernel |\nocite| macro.
% \changes{v0.6}{2002/08/24}{Added \cs{c@lanocite}}
%    \begin{macrocode}
\newcommand{\c@lanocite}[1]{\@bsphack
  \@for\@citeb:=#1\do{%
    \edef\@citeb{\expandafter\@firstofone\@citeb}%
    \if@filesw\immediate\write\@mainaux{\string\citation{\@citeb}}\fi
    \@ifundefined{b@\@citeb}{\G@refundefinedtrue
      \@latex@warning{Citation `\@citeb' undefined}}{}}%
  \@esphack}
\let\nocite\c@lanocite

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@lbnocite}
%  Need another version of |\nocite| for imports.
% \changes{v0.6}{2002/08/24}{Added \cs{c@lbnocite}}
%    \begin{macrocode}
\newcommand{\c@lbnocite}[1]{\@bsphack
  \@for\@citeb:=#1\do{%
    \edef\@citeb{\expandafter\@firstofone\@citeb}%
    \if@filesw\immediate\write\@auxout{\string\citation{\@citeb}}\fi
    \@ifundefined{B?\jobname?@\@citeb}{\G@refundefinedtrue
      \@latex@warning{Citation `\@citeb' undefined}}{}}%
  \@esphack}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@lb@citex}
% \begin{macro}{\c@lbbibcite}
%  For local citations in an imported document, special versions of
% |\@citex| and |\bibcite| (in \file{ltbibl.dtx}) are needed. I use
% the |\jobname| as a means of distinguishing between identical citation
% labels in different imported files.
% \changes{v0.6}{2002/08/24}{Added code for bib options to \cs{c@lbbibcite}}
%    \begin{macrocode}
\def\c@lb@citex[#1]#2{%
  \ifc@lcombib
    \c@lanocite{#2}%
  \fi
  \let\@citea\@empty
  \@cite{\@for\@citeb:=#2\do
    {\@citea\def\@citea{,\penalty\@m\ }%
     \edef\@citeb{\expandafter\@firstofone\@citeb\@empty}%
     \ifc@lcombib
       \c@lwritelocalbib
     \else
       \ifc@lonebib
         \c@lwritemainbib
       \else
         \c@lwritelocalbib
       \fi
     \fi}}{#1}}

\ifc@lonebib
  \newcommand{\c@lbbibcite}{\@newl@bel b}
  \ifc@lcombib
    \renewcommand{\c@lbbibcite}{\@newl@bel{B?\jobname?}}
  \fi
\else
  \newcommand{\c@lbbibcite}{\@newl@bel{B?\jobname?}}
\fi

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
%
% \subsection{Page styles and numbering}
%
% \begin{macro}{\c@lapagestyle}
% \begin{macro}{\c@lastyle}
% \begin{macro}{\c@lbpagestyle}
%    I want to be able to restore the main document pagestyle after an
% import. The current main pagestyle is kept in |\c@lastyle| which is
% defined by |\c@lapagestyle| (original in \file{ltpage.dtx}).
% \changes{v0.41}{2001/04/04}{Changed c@lstyle to \cs{c@lastyle} (two places)}
%    \begin{macrocode}
\newcommand{\c@lapagestyle}[1]{%
  \gdef\c@lastyle{#1}
  \@ifundefined{ps@#1}{}{\@nameuse{ps@#1}}
}
%    \end{macrocode}
% |\c@lbpagestyle| is the same as the kernel |\pagestyle|, except for some
% reason \LaTeX{} complains that the original command |\undefinedpagestyle|
% is undefined!
%    \begin{macrocode}
\newcommand{\c@lbpagestyle}[1]{%
  \@ifundefined{ps@#1}{}{\@nameuse{ps@#1}}
}

%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\c@lbpagenumbering}
% Need to do something about changing the page numbering in imported
% documents, as it can have an unfortunate impact on later numbering.
% The original command is in \file{ltpageno.dtx}. Disable changing
% the style of the page number unless the \Lopt{folios} option is in effect.
%    \begin{macrocode}
\ifc@lfolios
  \newcommand{\c@lbpagenumbering}[1]{%
    \global\c@page \@ne \gdef\thepage{\csname @#1\endcsname
      \c@page}}
\else
  \newcommand{\c@lbpagenumbering}[1]{}
\fi

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@laps@plain}
% \begin{macro}{\c@lbps@plain}
%    Alternative definitions for the |plain| pagestyle.
%    \begin{macrocode}
\if@twoside
  \newcommand{\c@laps@plain}{%
    \let\@mkboth\@gobbletwo
    \let\@oddhead\@empty \let\@evenhead\@empty
    \def\@oddfoot{\reset@font\hfil\thepage}%
    \def\@evenfoot{\reset@font\thepage\hfil}%
  }
  \ifc@lfolios
    \newcommand{\c@lbps@plain}{%
      \let\@mkboth\@gobbletwo
      \let\@oddhead\@empty \let\@evenhead\@empty
      \def\@oddfoot{\reset@font(\thepage)\hfil\thecolpage}%
      \def\@evenfoot{\reset@font\thecolpage\hfil(\thepage)}%
    }
  \else
    \newcommand{\c@lbps@plain}{%
      \let\@mkboth\@gobbletwo
      \let\@oddhead\@empty \let\@evenhead\@empty
      \def\@oddfoot{\reset@font\hfil\thecolpage}%
      \def\@evenfoot{\reset@font\thecolpage\hfil}%
    }
  \fi
\else
  \newcommand{\c@laps@plain}{%
    \let\@mkboth\@gobbletwo
    \let\@oddhead\@empty \let\@evenhead\@empty
    \def\@oddfoot{\reset@font\hfil\thepage}%
    \let\@evenfoot\@oddfoot
  }
  \ifc@lfolios
    \newcommand{\c@lbps@plain}{%
      \let\@mkboth\@gobbletwo
      \let\@oddhead\@empty \let\@evenhead\@empty
      \def\@oddfoot{\reset@font(\thepage)\hfil\thecolpage}%
      \let\@evenfoot\@oddfoot
    }
  \else
    \newcommand{\c@lbps@plain}{%
      \let\@mkboth\@gobbletwo
      \let\@oddhead\@empty \let\@evenhead\@empty
      \def\@oddfoot{\reset@font\hfil\thecolpage}%
      \let\@evenfoot\@oddfoot
    }
  \fi
\fi

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \section{New class commands}
%
%    That completes the preliminaries. We can now move on and define the
% new commands and environment implemented by the \Lpack{combine} class.
%
% \begin{macro}{\ps@combine}
%    A new pagestyle. Like |plain| but the page numbers are put at 
% a bottom corner instead of being centered. It also changes the
% the |plain| style to match.
%    \begin{macrocode}
\if@twoside
  \newcommand{\ps@combine}{%
    \let\@mkboth\@gobbletwo
    \let\@oddhead\@empty \let\@evenhead\@empty
    \def\@oddfoot{\reset@font\hfil\thepage}%
    \def\@evenfoot{\reset@font\thepage\hfil}%
    \let\ps@plain\c@laps@plain
  }
\else
  \newcommand{\ps@combine}{%
    \let\@mkboth\@gobbletwo
    \let\@oddhead\@empty \let\@evenhead\@empty
    \def\@oddfoot{\reset@font\hfil\thepage}%
    \let\@evenfoot\@oddfoot
    \let\ps@plain\c@laps@plain
  }
\fi

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\import}
% |\import{|\meta{texfile}|}| attempts to find and input the file 
% \meta{texfile}\texttt{.tex}. It is very loosely based on |\include|.
% It also adds the |\coltoctitle|, etc., to the ToC in a useful
% order\footnote{This need pointed out by Stefan Becuwe
%                (\texttt{Stefan.Becuwe@ua.ac.be}) by Email on 2001/07/09.}.
% \changes{v0.51}{2001/07/09}{\cs{import} adds coltoctitle, etc., to the ToC}
% \changes{v0.53}{2001/09/05}{Added empty \cs{numberline} to title in ToC}
%    \begin{macrocode}
\newcommand{\import}[1]{%
  \ifc@ltoctitle
    \addtocontents{toc}{\protect\contentsline{coltoctitle}%
      {\protect\numberline{}\savec@ltoctitle}{\thecolpage}}
    \c@ltoctitlefalse
  \fi
  \ifc@ltocauthor
    \addcontentsline{toc}{coltocauthor}{\protect\numberline{}\savec@ltocauthor}
    \c@ltocauthorfalse
  \fi
  \ifc@lpub
    \addcontentsline{toc}{published}{\protect\numberline{}\savec@lpublished}
    \c@lpubfalse
  \fi
  \gdef\jobname{#1}
%    \end{macrocode}
% \changes{v0.6}{2002/08/24}{Added empty definition for nocite{*} 
%                            handling to \cs{import}}
%    \begin{macrocode}
  \expandafter\let\csname B?\jobname?@*\endcsname\@empty
  \gdef\c@lauxfile{#1.aux}
  \@tempswatrue
  \let\@auxout\@partaux
  \@input@{#1.tex}%
%%  \@writeckpt{#1}%
  \let\@auxout\@mainaux
}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\bodytitlemark}
% \begin{macro}{\bodytitle}
%    |\bodytitle[|\meta{short}|]{|\meta{long}|}| is for putting a sectional
% title into the main document for the following imported document. It is
% like a |\section| (or |\chapter|) command and has its own numbering scheme.
%    \begin{macrocode}
\newcommand*\bodytitlemark[1]{}
\newcounter{bodytitle}
\renewcommand{\thebodytitle}{\@arabic\c@bodytitle}
\ifc@lhaschapter
  \newcommand{\bodytitle}{\@startsection{bodytitle}{0}{\z@}%
                                        {-3.5ex \@plus -1ex \@minus -.2ex}%
                                        {2.3ex \@plus.2ex}%
                                        {\normalfont\Huge\bfseries}}
\else
  \newcommand{\bodytitle}{\@startsection{bodytitle}{1}{\z@}%
                                        {-3.5ex \@plus -1ex \@minus -.2ex}%
                                        {2.3ex \@plus.2ex}%
                                        {\normalfont\Large\bfseries}}
\fi

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\c@ll@chapseci}
% \begin{macro}{\c@ll@chapsecii}
%    These are two helper macros that contain common code used for
% some of the ToC typesetting commands that will be defined. Essentially
% they hold the first and second quarter of the code for ToC typesetting
% of chapters and sections.
%    \begin{macrocode}
\newcommand{\c@ll@chapseci}{%
%  \setlength\@tempdima{1.5em}%
  \setlength\@tempdima{0em}%
  \begingroup
    \parindent \z@ \rightskip \@pnumwidth
    \parfillskip -\@pnumwidth
    \leavevmode
}
\newcommand{\c@ll@chapsecii}[2]{%
  \advance\leftskip\@tempdima
  \hskip -\leftskip
  #1\nobreak\hfil \nobreak\hb@xt@\@pnumwidth{\hss #2}\par
}

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\l@bodytitle}
% |\l@bodytitle| typesets the ToC entry for |\bodytitle|.
%    \begin{macrocode}
\ifc@lhaschapter
  \newcommand*\l@bodytitle[2]{%  % as per chapter
    \ifnum \c@tocdepth >\m@ne
      \addpenalty{-\@highpenalty}%
      \addvspace{1.0em \@plus\p@}%
      \c@ll@chapseci
      \bfseries                    %% bold ToC entry
      \c@ll@chapsecii{#1}{#2}
      \penalty\@highpenalty
      \endgroup
    \fi}
\else
  \newcommand*\l@bodytitle[2]{%  % as per section
    \ifnum \c@tocdepth >\z@
      \addpenalty\@secpenalty
      \addvspace{1.0em \@plus\p@}%
      \c@ll@chapseci
      \bfseries                    %% bold ToC entry
      \c@ll@chapsecii{#1}{#2}
      \endgroup
    \fi}
\fi

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\toctitleindent}
% \begin{macro}{\tocauthorindent}
% \begin{macro}{\tocpubindent}
% \begin{macro}{\toctocindent}
%    These lengths control the indentations of the imported title, author,
% published, and sectional headings in the main ToC.
%    \begin{macrocode}
\newlength{\toctitleindent}\setlength{\toctitleindent}{0pt}
\newlength{\tocauthorindent}\setlength{\tocauthorindent}{1.5em}
\newlength{\tocpubindent}\setlength{\tocpubindent}{1.5em}
\newlength{\toctocindent}\setlength{\toctocindent}{1.5em}

%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{environment}{tocindent}
%  The |tocindent| environment is used to set the various main ToC indents.
%    \begin{macrocode}
\newenvironment{tocindent}[1]{%
  \hangindent #1 \hangafter -100\relax}{}

%    \end{macrocode}
% \end{environment}
%
% \begin{macro}{\toctitlefont}
% \begin{macro}{\tocauthorfont}
% \begin{macro}{\tocpubfont}
%    These macros define the fonts to be used for typesetting the title,
% author and publication entries in the main ToC.
%    \begin{macrocode}
\newcommand{\toctitlefont}{\bfseries}
\newcommand{\tocauthorfont}{\itshape}
\newcommand{\tocpubfont}{\normalfont}

%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\coltoctitle}
% \begin{macro}{\l@coltoctitle}
% |\coltoctitle{|\meta{title}|}| adds \meta{title} to the ToC for the 
% following imported document. The ToC entry is typeset by |\l@coltoctitle|.
% \changes{v0.51}{2001/07/09}{Save the value of \cs{coltoctitle}}
%    \begin{macrocode}
\newcommand*{\coltoctitle}[1]{%
  \c@ltoctitletrue%
  \gdef\savec@ltoctitle{#1}
}

%    \end{macrocode}
%
%    We want to arrange it so that if the title is near the bottom of a
% page in the ToC, have the pagebreak before rather than after the title.
% \changes{v0.42}{2001/04/04}{Changed pagebreak penalties in \cs{l@coltoctitle}}
% \changes{v0.53}{2001/09/05}{Fixed extraneous space in \cs{l@coltoctitle}}
%    \begin{macrocode}
\ifc@lhaschapter
  \newcommand*\l@coltoctitle[2]{%  % as per chapter
    \ifnum \c@tocdepth >\m@ne
      \addpenalty{-\@highpenalty}% encourage page break
      \addvspace{1.0em \@plus\p@}%
      \c@ll@chapseci
      \setlength{\@tempdima}{\toctitleindent}% eliminate any spaces here
      \toctitlefont                    %% bold ToC entry
      \c@ll@chapsecii{#1}{#2}
      \penalty\@highpenalty      % discourage page break
      \endgroup
    \fi}
\else
  \newcommand*\l@coltoctitle[2]{%  % as per section
    \ifnum \c@tocdepth >\z@
      \addpenalty\@secpenalty
      \addvspace{1.0em \@plus\p@}%
      \c@ll@chapseci
      \setlength{\@tempdima}{\toctitleindent}% eliminate any spaces here
      \toctitlefont                    %% bold ToC entry
      \c@ll@chapsecii{#1}{#2}
      \penalty\@highpenalty      % discourage page break
      \endgroup
    \fi}
\fi

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\coltocauthor}
% \begin{macro}{\l@coltocauthor}
% |\coltocauthor{|\meta{authors}|}| adds \meta{authors} to the ToC for the 
% following imported document. The ToC entry is typeset by |\l@coltocauthor|.
% Note that a page number is not printed.
% \changes{v0.51}{2001/07/09}{Save value of \cs{coltocauthor}}
%    \begin{macrocode}
\newcommand*{\coltocauthor}[1]{%
  \c@ltocauthortrue%
  \gdef\savec@ltocauthor{#1}
}

%    \end{macrocode}
% As it is unlikely that the author will be in the ToC without the title,
% don't encourage a page break beforehand.
% \changes{v0.42}{2001/04/04}{Changed pagebreak penalties in \cs{l@coltocauthor}}
% \changes{v0.53}{2001/09/05}{Fixed extraneous space in \cs{l@coltocauthor}}
%
%    \begin{macrocode}
\ifc@lhaschapter
  \newcommand*\l@coltocauthor[2]{%  % similar to chapter
    \ifnum \c@tocdepth >\m@ne
      \c@ll@chapseci
      \setlength{\@tempdima}{\tocauthorindent}% eliminate any spaces here
      \tocauthorfont                    %% italic ToC entry
      \c@ll@chapsecii{#1}{}
      \penalty\@highpenalty  % discourage page break
      \endgroup
    \fi}
\else
  \newcommand*\l@coltocauthor[2]{%  % similar to section
    \ifnum \c@tocdepth >\z@
      \c@ll@chapseci
      \setlength{\@tempdima}{\tocauthorindent}% eliminate any spaces here
      \tocauthorfont                    %% italic ToC entry
      \c@ll@chapsecii{#1}{}
      \penalty\@highpenalty  % discourage page break
      \endgroup
    \fi}
\fi

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\published}
% \begin{macro}{\pubfont}
% \begin{macro}{\l@published}
% |\published[|\meta{short}|]{|\meta{long}|}| adds \meta{long} to the
% body of the document. It also adds \meta{long} to the ToC, unless the
% optional argument is present, in which case \meta{short} is added
% to the ToC.
%
%    In the body of the document \meta{long} is typeset using |\pubfont|.
% The ToC entry is typeset by |\l@published|.
% Note that a page number is not printed.
% \changes{v0.51}{2001/07/09}{Save value of \cs{published}}
%    \begin{macrocode}
\newcommand{\published}[2][\@empty]{%
  \c@lpubtrue
  \ifc@lnopubintoc\else
    \ifx #1\@empty
      \gdef\savec@lpublished{#2}
    \else
      \gdef\savec@lpublished{#1}
    \fi
  \fi
  \ifc@lnopubindoc\else
    {\parindent \z@ \pubfont #2\par\nobreak}
  \fi
}
\newcommand{\pubfont}{\normalfont\centering}

%    \end{macrocode}
% As the published information is unlikely to be in the ToC without
% prior title or author information, don't encourage a prior break,
% but also don't try and prevent one afterwards either.
% \changes{v0.42}{2001/04/04}{Changed pagebreak penalties in \cs{l@published}}
% \changes{v0.53}{2001/09/05}{Fixed extraneous space in \cs{l@published}}
%
%    \begin{macrocode}
\ifc@lhaschapter
  \newcommand*\l@published[2]{%  % similar to chapter
    \ifnum \c@tocdepth >\m@ne
      \c@ll@chapseci       
      \setlength{\@tempdima}{\tocpubindent}% eliminate any spaces here
      \tocpubfont               %% normal font ToC entry
      \c@ll@chapsecii{#1}{}
      \endgroup
    \fi}
\else
  \newcommand*\l@published[2]{%  % similar to section
    \ifnum \c@tocdepth >\z@
      \c@ll@chapseci           
      \setlength{\@tempdima}{\tocpubindent}% eliminate any spaces here
      \tocpubfont              %% normal font ToC entry
      \c@ll@chapsecii{#1}{}
      \endgroup
    \fi}
\fi

%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\erasetitling}
%    This macro sets the |\coltoctitle|, |\coltocauthor| and |\published|
% flags to FALSE.
%    \begin{macrocode}
\newcommand{\erasetitling}{\c@ltoctitlefalse\c@ltocauthorfalse\c@lpubfalse}

%    \end{macrocode}
% \end{macro}
%
%
% \begin{environment}{papers}
%  The |papers| environment has one optional argument, 
% default |\cleardoublepage| which gets executed at the start of the 
% environment. Then the appropriate changes to the kernel commands are
% executed.
%    \begin{macrocode}
\newenvironment{papers}[1][\cleardoublepage]{%
#1
\setuppapers
}{%
\takedownpapers
}

%    \end{macrocode}
% \end{environment}
%
% \begin{macro}{\setuppapers}
% This macro executes the kernel modifications within the |papers| 
% environment. Various options are also checked and implemented if required.
% Sectional numbering is reset to zero. Imported files can't |\include|
% other files, so |\include| is replaced by |\input|. If |\chapter| is
% defined, then the chapter typesetting is redefined to look more like
% a |\section| heading.
% \changes{v0.41}{2000/06/18}{\cs{def}ed \cs{maketitle} instead of \cs{let}ing
% inside \cs{setuppapers} to ignore any titling package redefinitions}
% \changes{v0.52}{2001/08/25}{Added \cs{c@lbLoadClass} to \cs{setuppapers}}
% \changes{v0.6}{2002/08/24}{Added onebib and combinedbib options code to \cs{setuppapers}}
% \changes{v0.62}{2003/06/30}{Left \cs{bibliographystyle} unaltered}.
%    \begin{macrocode}
\newcommand{\setuppapers}{%
\let\documentclass\c@lbdocumentclass
\ifc@lpackages\else \let\usepackage\c@lbusepackage \fi
\let\document\c@lbdocument
\let\enddocument\c@lbenddocument
\let\LoadClass\c@lbLoadClass
%% \let\maketitle\c@lbmaketitle
\def\maketitle{\c@lbmaketitle}
\let\@writefile\c@lb@writefile
\let\@starttoc\c@lb@starttoc
\ifc@lnomaketitle \let\maketitle\relax \fi
\ifc@lnotoc \let\tableofcontents\relax \fi
\ifc@lnolof \let\listoffigures\relax \fi
\ifc@lnolot \let\listoftables\relax \fi
\ifc@lmaintoc \let\addtocontents\c@lbaddtocontents \fi
\let\label\c@lblabel
\let\@setref\c@lb@setref
\let\newlabel\c@lbnewlabel
\let\ref\c@lbref
\let\pageref\c@lbpageref
%%% \renewcommand{\bibliographystyle}[1]{}
\ifc@lcombib
\else
  \ifc@lonebib
    \renewcommand{\bibliography}[1]{}
  \fi
\fi
\let\@citex\c@lb@citex
\let\bibcite\c@lbbibcite
\let\nocite\c@lbnocite
\ifc@lhaschapter
  \renewcommand{\chapter}{\@startsection{chapter}{0}{\z@}%
                                        {-3.5ex \@plus -1ex \@minus -.2ex}%
                                        {2.3ex \@plus.2ex}%
                                        {\normalfont\Large\bfseries}}
\fi
\c@ltoctitlefalse
\c@ltocauthorfalse
\c@lpubfalse
\let\pagenumbering\c@lbpagenumbering
\setcounter{colpage}{\value{page}}
\let\pagestyle\c@lbpagestyle
\pagestyle{\c@lastyle}
\let\include\input
}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\takedownpapers}
% This macro executes the actions, if any, at the end of the |papers| 
% environment.
%    \begin{macrocode}
\newcommand{\takedownpapers}{%
}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\emptyAtBeginDocument}
% This macro empties tokens stored for use at |\begin{document}| time.
% \changes{v0.51}{2003/07/17}{Added \cs{emptyAtBeginDocument}}
%    \begin{macrocode}
\newcommand{\emptyAtBeginDocument}{\let\@begindocumenthook\@empty}

%    \end{macrocode}
% \end{macro}
%
% Finally, use the appropriate revised kernel commands for the main document.
% \changes{v0.41}{2000/06/18}{Moved main document \cs{maketitle} letting to
% its begin document}
%    \begin{macrocode}
\let\document\c@ladocument
\let\enddocument\c@laenddocument
%%\let\maketitle\c@lamaketitle
\let\pagestyle\c@lapagestyle
\pagestyle{combine}

%    \end{macrocode}
%
%
%
%
%    The end of this class.
%    \begin{macrocode}
%</usc>
%    \end{macrocode}
%
% \section{The \Lpack{combinet} package code} \label{packcode}
%
%
%    \begin{macrocode}
%<*pck>
%    \end{macrocode}
% The usual preliminaries. The \Lpack{combine} class is expected.
% \changes{v0.53}{2001/09/05}{combinet package now version 0.2}
% \changes{v0.64}{2004/03/06}{combinet package now version 0.2a}
%    \begin{macrocode}
\@ifclassloaded{combine}{}{%
  \PackageError{combinet}{The `combine' class is expected}{\@ehc}%
}

%    \end{macrocode}
%
% \begin{macro}{\ifc@lnomtitle}
% \begin{macro}{\ifc@lnomauthor}
% \begin{macro}{\ifc@lnothanks}
% \begin{macro}{\ifc@lpubopt}
% \begin{macro}{\ifc@lpubtop}
% \begin{macro}{\ifc@lpubs}
%    Booleans for implementing the options.
%    \begin{macrocode}
\newif\ifc@lnomtitle
  \c@lnomtitlefalse
\newif\ifc@lnomauthor
  \c@lnomauthorfalse
\newif\ifc@lnothanks
  \c@lnothanksfalse
\newif\ifc@lpubopt
  \c@lpuboptfalse
\newif\ifc@lpubtop
  \c@lpubtopfalse
\newif\ifc@lpubs
  \c@lpubsfalse

%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% Declare and execute the options.
%    \begin{macrocode}
\DeclareOption{nomtitle}{\c@lnomtitletrue}
\DeclareOption{nomauthor}{\c@lnomauthortrue}
\DeclareOption{nothanks}{\c@lnothankstrue}
\DeclareOption{pub}{\c@lpubopttrue\c@lpubtopfalse\c@lpubstrue}
\DeclareOption{pubtop}{\c@lpubtoptrue\c@lpuboptfalse\c@lpubstrue}
\ProcessOptions\relax

%    \end{macrocode}
%
% \begin{macro}{\published}
% \begin{macro}{\c@lpubtoc}
% \begin{macro}{\c@lpubbody}
% In order to implement either of the \Lopt{pub} options, the |\published|
% command must be modified to delay printing.
%    \begin{macrocode}
\ifc@lpubs
  \renewcommand{\published}[2][\@empty]{%
    \c@lpubtrue
    \ifx #1\@empty
      \gdef\c@lpubtoc{#2}
    \else
      \gdef\c@lpubtoc{#1}
    \fi
    \gdef\c@lpubbody{#2}
  }
\fi

%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\title}
% \begin{macro}{\author}
%    To implement the \Lopt{nothanks} option, the |\title| and |\author|
% kernel commands must be extended to save their values.
%
%    Originally I used |\xdef| below which worked unless there was some
% command other than |\thanks| in the title or author text. 
% David Kastrup\footnote{At \texttt{dak@neuroinformatik.ruhr-uni-bochum.de}.}
% and Donald Arseneau\footnote{At \texttt{asnd@triumf.ca}.} 
% both pointed out the use of |\protected@xdef|.
% Barbara Beeton\footnote{\texttt{bnb@ams.org}} suggested adding the |\unskip|
% to the redefinition of |\and| in order to remove any preceeding spaces when
% it gets printed in the ToC.
% \changes{v0.4}{2000/06/09}{Added \cs{unskip} to \cs{and} redefinition}
% \changes{v0.41}{2000/06/18}{Appended to \cs{title} and \cs{author} definitions}
%    \begin{macrocode}
\appendiargdef{\title}{%
  \begingroup
    \renewcommand{\thanks}[1]{}
    \protected@xdef\c@l@title{#1}
  \endgroup
}
\appendiargdef{\author}{%
  \begingroup
    \renewcommand{\thanks}[1]{}
    \renewcommand{\and}{\unskip, }
    \protected@xdef\c@l@author{#1}
  \endgroup
}

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\c@lbmaketitle}
%    The |\c@lbmaketitle| command is (re)defined so that it adds the title
% and author (if given) to the main ToC. If |\coltoctitle| and/or
% |\coltocauthor| have been used then nothing is done with the title
% and/or author respectively. 
% \changes{v0.53}{2001/09/05}{Added empty \cs{numberline} in \cs{c@lbmaketitle}}
% \changes{v0.64}{2004/03/06}{Changed \cs{c@laaddtocontents} for titles to
%                             \cs{c@laaddcontentsline} in \cs{c@lbmaketitle}}
%    \begin{macrocode}
\def\c@lbmaketitle{\par
  \begingroup
    \let\newpage\relax
    \let\@maketitle\c@lb@maketitle
    \ifc@lpub
      \ifc@lpubtop
        \ifc@lnopubindoc\else
          {\parindent\z@ \pubfont \c@lpubbody\par\nobreak}
        \fi
      \fi
    \fi
    \c@lmtitle        %% typeset the title block
  \endgroup
  \setcounter{footnote}{0}
  \begingroup
    \let\thanks\@empty
    \ifc@ltoctitle\else
      \ifc@lnomtitle\else
        \ifx\@title\@empty\else
          \ifc@lnothanks
%    \end{macrocode}
% I originally used 
% \begin{verbatim}
%            \c@laaddtocontents{toc}%
%              {\protect\contentsline{coltoctitle}%
%              {\protect\numberline{}\c@l@title}{\thecolpage}}
% \end{verbatim}
% below, but James Szinger\footnote{Email, 2004/03/05, \texttt{szinger@lanl.gov}}
% asked me to change to \verb?\c@laaddcontentsline? instead 
% (which I should have done, looking back I've no idea why I didn't) to help
% with using hyperref, which he said required redefining
% \verb?\c@laaddcontentsline? to be compatible with hyperref's (hyperref never
% seems to bother with trying to be compatible with other classes though).
%    \begin{macrocode}
            \c@laaddcontentsline{toc}%
              {coltoctitle}{\protect\numberline{}\c@l@title}%
          \else
            \c@laaddcontentsline{toc}%
              {coltoctitle}{\protect\numberline{}\@title}%
          \fi
        \fi
      \fi
    \fi
    \ifc@ltocauthor\else
      \ifc@lnomauthor\else
        \ifx\@author\@empty\else
          \ifc@lnothanks
            \c@laaddcontentsline{toc}%
              {coltocauthor}{\protect\numberline{}\c@l@author}
          \else
            \c@laaddcontentsline{toc}%
              {coltocauthor}{\protect\numberline{}\@author}
          \fi
        \fi
      \fi
    \fi
  \endgroup
  \ifc@lpub
    \ifc@lpubopt
      \ifc@lnopubindoc\else
        {\parindent\z@ \pubfont \c@lpubbody\par\nobreak}
      \fi
    \fi
    \ifc@lpubs
      \ifc@lnopubintoc\else
        \c@laaddcontentsline{toc}{published}{\protect\numberline{}\c@lpubtoc}
      \fi
    \fi
  \fi
  \c@lmtitlempty
}

%    \end{macrocode}
% \end{macro}
%
%
%    The end of this package
%    \begin{macrocode}
%</pck>
%    \end{macrocode}
%
%
% \section{The \Lpack{combnat} package code} \label{natpackcode}
%
% This package calls the \Lpack{natbib} package~\cite{NATBIB}
% and then makes some minor changes to some of its macro definitions.
% \changes{v0.6}{2002/08/24}{Added onebib option processing to combnat package}
%
%    \begin{macrocode}
%<*natpack>
%    \end{macrocode}
% The usual preliminaries. The \Lpack{natbib} package is required
% and all options are passed to it to deal with.
% \changes{v0.5}{2001/07/03}{Added the combnat package}
% \changes{v0.6}{2002/08/24}{Added combine class check to the combnat package}
% \changes{v0.6}{2002/08/24}{combnat package is now version 0.2}
% \changes{v0.61}{2003/05/22}{combnat package is now version 0.21}
% \changes{v0.61}{2003/05/22}{Somehow removed extraneous space from combnat package}
% \changes{v0.7}{2010/03/22}{combnat bug fix thanks to Nicola Talbot}
%    \begin{macrocode}
\@ifclassloaded{combine}{}{%
  \PackageError{combnat}{The `combine' class is expected}{\@ehc}}
\RequirePackageWithOptions{natbib}
%    \end{macrocode}
%
% For multiple bibliographies (|\c@lonebibfalse|)
% the change consists of replacing 
% \Lpack{natbib}'s
% naming of citation labels in the \file{.aux} files by the form
% used by the \Lpack{combine} class. That is, the |b@| in each
% code fragment like |b@#...| or |b@\...| is replaced by 
% |B?\jobname?@...|.
%
% For a single main bibliography |\c@lonebibtrue|, implementation is much 
% easier, merely ensuring that the stuff gets written to the main
% *.aux file.
%
%
% \begin{macro}{\c@lNATwritemainbib}
% \begin{macro}{\c@lNATwritemainbibdate}
% We have to write different biblabels to different files. These write
% to the main *.aux file.
%    \begin{macrocode}
\newcommand{\c@lNATwritemainbib}{%
  \if@filesw\immediate\write\@mainaux{\string\citation{\@citeb}}\fi
  \@ifundefined{b@\@citeb\@extra@b@citeb}{%
    {\reset@font\bfseries?}
     \NAT@citeundefined\PackageWarning{natbib}%
    {Citation `\@citeb' on page \thepage \space undefined}}}

\newcommand{\c@lNATwritemainbibdate}{%
  \if@filesw\immediate\write\@mainaux{\string\citation{\@citeb}}\fi
  \@ifundefined{b@\@citeb\@extra@b@citeb}{\@citea%
    {\reset@font\bfseries ?}\NAT@citeundefined
     \PackageWarning{natbib}%
       {Citation `\@citeb' on page \thepage \space undefined}
     \def\NAT@date{}}}

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\c@lNATwritelocalbib}
% \begin{macro}{\c@lNATwritelocalbibdate}
% We have to write different biblabels to different files. These write
% to the local *.aux files.
%    \begin{macrocode}
\newcommand{\c@lNATwritelocalbib}{%
  \if@filesw\immediate\write\@auxout{\string\citation{\@citeb}}\fi
  \@ifundefined{B?\jobname?@\@citeb\@extra@b@citeb}{%
    {\reset@font\bfseries?}
     \NAT@citeundefined\PackageWarning{natbib}%
    {Citation `\@citeb' on page \thepage \space undefined}}}

\newcommand{\c@lNATwritelocalbibdate}{%
  \if@filesw\immediate\write\@auxout{\string\citation{\@citeb}}\fi
  \@ifundefined{B?\jobname?@\@citeb\@extra@b@citeb}{\@citea%
    {\reset@font\bfseries ?}\NAT@citeundefined
     \PackageWarning{natbib}%
       {Citation `\@citeb' on page \thepage \space undefined}
     \def\NAT@date{}}}

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
%
% \begin{macro}{\c@lNAT@citexnum@swatrue}
% Holds some of the internals of the original |\NAT@citexnum|.
%    \begin{macrocode}
\newcommand{\c@lNAT@citexnum@swatrue}{%
  \ifnum\NAT@ctype>1\relax\@citea
    \hyper@natlinkstart{\@citeb\@extra@b@citeb}%
        \ifnum\NAT@ctype=2\relax\NAT@test{\NAT@ctype}%
        \else\NAT@alias
        \fi\hyper@natlinkend\else
    \ifnum\NAT@sort>1\relax
      \begingroup\catcode`\_=8
        \ifcat _\ifnum\z@<0\NAT@num _\else A\fi
          \global\let\NAT@nm=\NAT@num \else \gdef\NAT@nm{-2}\fi
        \ifcat _\ifnum\z@<0\NAT@last@num _\else A\fi
          \global\@tempcnta=\NAT@last@num \global\advance\@tempcnta by\@ne
          \else \global\@tempcnta\m@ne\fi
      \endgroup
      \ifnum\NAT@nm=\@tempcnta
        \ifx\NAT@last@yr\relax
          \edef\NAT@last@yr{\@citea \mbox{\noexpand\citenumfont\NAT@num}}%
        \else
          \edef\NAT@last@yr{--\penalty\@m\mbox{\noexpand\citenumfont\NAT@num}}%
        \fi
      \else
        \NAT@last@yr \@citea \mbox{\citenumfont\NAT@num}%
        \let\NAT@last@yr\relax
      \fi
    \else
      \@citea \mbox{\hyper@natlinkstart{\@citeb\@extra@b@citeb}%
        {\citenumfont\NAT@num}\hyper@natlinkend}%
    \fi
  \fi
  \def\@citea{\NAT@sep\penalty\@m\NAT@space}%
}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\NAT@citexnum}
% We redefine the original |\NAT@citexnum| to write for the main file.
%    \begin{macrocode}
\def\NAT@citexnum[#1][#2]#3{%
  \NAT@sort@cites{#3}%
  \let\@citea\@empty
  \@cite{\def\NAT@num{-1}\let\NAT@last@yr\relax\let\NAT@nm\@empty
    \@for\@citeb:=\NAT@cite@list\do
      {\edef\@citeb{\expandafter\@firstofone\@citeb}%
       \c@lNATwritemainbib   %%% change here
       {\let\NAT@last@num\NAT@num\let\NAT@last@nm\NAT@nm
        \NAT@parse{\@citeb}%
        \ifNAT@longnames\@ifundefined{bv@\@citeb\@extra@b@citeb}{%
            \let\NAT@name=\NAT@all@names
            \global\@namedef{bv@\@citeb\@extra@b@citeb}{}}{}%
        \fi
        \ifNAT@full\let\NAT@nm\NAT@all@names\else
          \let\NAT@nm\NAT@name
        \fi
      \ifNAT@swa
        \c@lNAT@citexnum@swatrue
      \else
        \ifcase\NAT@ctype\relax
          \ifx\NAT@last@nm\NAT@nm \NAT@yrsep\penalty\@m\NAT@space\else
          \@citea \NAT@test{1}\ \NAT@@open
          \if*#1*\else#1\ \fi\fi \NAT@mbox{%
          \hyper@natlinkstart{\@citeb\@extra@b@citeb}%
          {\citenumfont\NAT@num}\hyper@natlinkend}%
          \def\@citea{\NAT@@close\NAT@sep\penalty\@m\ }%
        \or\@citea
          \hyper@natlinkstart{\@citeb\@extra@b@citeb}%
           \NAT@test{\NAT@ctype}\hyper@natlinkend
          \def\@citea{\NAT@sep\penalty\@m\ }%
        \or\@citea
          \hyper@natlinkstart{\@citeb\@extra@b@citeb}%
           \NAT@test{\NAT@ctype}\hyper@natlinkend
          \def\@citea{\NAT@sep\penalty\@m\ }%
        \or\@citea
          \hyper@natlinkstart{\@citeb\@extra@b@citeb}%
           \NAT@alias\hyper@natlinkend
          \def\@citea{\NAT@sep\penalty\@m\ }%
        \fi
      \fi
      }}%
      \ifnum\NAT@sort>1\relax\NAT@last@yr\fi
      \ifNAT@swa\else\ifnum\NAT@ctype=0\if*#2*\else
      \NAT@cmt#2\fi \NAT@@close\fi\fi}{#1}{#2}}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@lbNAT@citexnum}
% A local version of |\NAT@citexnum|.
%    \begin{macrocode}
\def\c@lbNAT@citexnum[#1][#2]#3{%
  \ifc@lcombib\c@laNATnocite{#3}\fi   %%% change here
  \NAT@sort@cites{#3}%
  \let\@citea\@empty
  \@cite{\def\NAT@num{-1}\let\NAT@last@yr\relax\let\NAT@nm\@empty
    \@for\@citeb:=\NAT@cite@list\do
    {\edef\@citeb{\expandafter\@firstofone\@citeb}%
     \c@lNATwritelocalbib             %%% change here
     {\let\NAT@last@num\NAT@num\let\NAT@last@nm\NAT@nm
      \NAT@parse{\@citeb}%
      \ifNAT@longnames\@ifundefined{bv@\@citeb\@extra@b@citeb}{%
        \let\NAT@name=\NAT@all@names
        \global\@namedef{bv@\@citeb\@extra@b@citeb}{}}{}%
      \fi
      \ifNAT@full\let\NAT@nm\NAT@all@names\else
        \let\NAT@nm\NAT@name\fi
      \ifNAT@swa
        \c@lNAT@citexnum@swatrue
      \else
        \ifcase\NAT@ctype\relax
          \ifx\NAT@last@nm\NAT@nm \NAT@yrsep\penalty\@m\NAT@space\else
          \@citea \NAT@test{1}\ \NAT@@open
          \if*#1*\else#1\ \fi\fi \NAT@mbox{%
          \hyper@natlinkstart{\@citeb\@extra@b@citeb}%
          {\citenumfont\NAT@num}\hyper@natlinkend}%
          \def\@citea{\NAT@@close\NAT@sep\penalty\@m\ }%
        \or\@citea
          \hyper@natlinkstart{\@citeb\@extra@b@citeb}%
          \NAT@test{\NAT@ctype}\hyper@natlinkend
          \def\@citea{\NAT@sep\penalty\@m\ }%
        \or\@citea
          \hyper@natlinkstart{\@citeb\@extra@b@citeb}%
          \NAT@test{\NAT@ctype}\hyper@natlinkend
          \def\@citea{\NAT@sep\penalty\@m\ }%
        \or\@citea
          \hyper@natlinkstart{\@citeb\@extra@b@citeb}%
          \NAT@alias\hyper@natlinkend
          \def\@citea{\NAT@sep\penalty\@m\ }%
        \fi\fi
      }}%
      \ifnum\NAT@sort>1\relax\NAT@last@yr\fi
      \ifNAT@swa\else\ifnum\NAT@ctype=0\if*#2*\else
      \NAT@cmt#2\fi \NAT@@close\fi\fi}{#1}{#2}}

%    \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\c@lNAT@citex@swatrue}
% Holds some of the internals of the original |\NAT@citex|.
%    \begin{macrocode}
\newcommand{\c@lNAT@citex@swatrue}{%
  \ifcase\NAT@ctype
    \if\relax\NAT@date\relax
      \@citea\hyper@natlinkstart{\@citeb\@extra@b@citeb}%
      \NAT@nmfmt{\NAT@nm}\NAT@date\hyper@natlinkend
    \else
      \ifx\NAT@last@nm\NAT@nm\NAT@yrsep
        \ifx\NAT@last@yr\NAT@year
          \hyper@natlinkstart{\@citeb\@extra@b@citeb}\NAT@exlab
          \hyper@natlinkend
        \else
          \unskip\
          \hyper@natlinkstart{\@citeb\@extra@b@citeb}\NAT@date
          \hyper@natlinkend
        \fi
      \else\@citea\hyper@natlinkstart{\@citeb\@extra@b@citeb}%
        \NAT@nmfmt{\NAT@nm}%
        \hyper@natlinkbreak{\NAT@aysep\ }{\@citeb\@extra@b@citeb}%
        \NAT@date\hyper@natlinkend
      \fi
    \fi
  \or\@citea\hyper@natlinkstart{\@citeb\@extra@b@citeb}%
     \NAT@nmfmt{\NAT@nm}\hyper@natlinkend
  \or\@citea\hyper@natlinkstart{\@citeb\@extra@b@citeb}%
     \NAT@date\hyper@natlinkend
  \or\@citea\hyper@natlinkstart{\@citeb\@extra@b@citeb}%
     \NAT@alias\hyper@natlinkend
  \fi \def\@citea{\NAT@sep\ }%
}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@laNAT@citex}
% We redefine the original |\NAT@citex| macro for the main document.
%    \begin{macrocode}
\def\NAT@citex%
  [#1][#2]#3{%
  \NAT@sort@cites{#3}%
  \let\@citea\@empty
  \@cite{\let\NAT@nm\@empty\let\NAT@year\@empty
    \@for\@citeb:=\NAT@cite@list\do
    {\edef\@citeb{\expandafter\@firstofone\@citeb}%
     \c@lNATwritemainbibdate     %%%% change here
     {\let\NAT@last@nm=\NAT@nm\let\NAT@last@yr=\NAT@year
     \NAT@parse{\@citeb}%
     \ifNAT@longnames\@ifundefined{bv@\@citeb\@extra@b@citeb}{%
         \let\NAT@name=\NAT@all@names
         \global\@namedef{bv@\@citeb\@extra@b@citeb}{}}{}%
     \fi
     \ifNAT@full\let\NAT@nm\NAT@all@names\else
       \let\NAT@nm\NAT@name\fi
     \ifNAT@swa
       \c@lNAT@citex@swatrue
     \else
       \ifcase\NAT@ctype
         \if\relax\NAT@date\relax
           \@citea\hyper@natlinkstart{\@citeb\@extra@b@citeb}%
           \NAT@nmfmt{\NAT@nm}\hyper@natlinkend
         \else
           \ifx\NAT@last@nm\NAT@nm\NAT@yrsep
             \ifx\NAT@last@yr\NAT@year
               \hyper@natlinkstart{\@citeb\@extra@b@citeb}\NAT@exlab
               \hyper@natlinkend
             \else\unskip\
               \hyper@natlinkstart{\@citeb\@extra@b@citeb}\NAT@date
               \hyper@natlinkend
             \fi
           \else\@citea\hyper@natlinkstart{\@citeb\@extra@b@citeb}%
             \NAT@nmfmt{\NAT@nm}%
             \hyper@natlinkbreak{\ \NAT@@open\if*#1*\else#1\ \fi}%
                {\@citeb\@extra@b@citeb}%
             \NAT@date\hyper@natlinkend\fi
        \fi
       \or\@citea\hyper@natlinkstart{\@citeb\@extra@b@citeb}%
          \NAT@nmfmt{\NAT@nm}\hyper@natlinkend
       \or\@citea\hyper@natlinkstart{\@citeb\@extra@b@citeb}%
          \NAT@date\hyper@natlinkend
       \or\@citea\hyper@natlinkstart{\@citeb\@extra@b@citeb}%
          \NAT@alias\hyper@natlinkend
       \fi  \if\relax\NAT@date\relax\def\@citea{\NAT@sep\ }%
            \else\def\@citea{\NAT@@close\NAT@sep\ }\fi
     \fi
     }}\ifNAT@swa\else\if*#2*\else\NAT@cmt#2\fi
    \if\relax\NAT@date\relax\else\NAT@@close\fi\fi}{#1}{#2}}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@lbNAT@citex}
% The local version of |\NAT@citex|.
%    \begin{macrocode}
\def\c@lbNAT@citex[#1][#2]#3{%
  \ifc@lcombib \c@laNATnocite{#3} \fi    %%%% change here
  \NAT@sort@cites{#3}%
  \let\@citea\@empty
  \@cite{\let\NAT@nm\@empty\let\NAT@year\@empty
    \@for\@citeb:=\NAT@cite@list\do
    {\edef\@citeb{\expandafter\@firstofone\@citeb}%
     \c@lNATwritelocalbibdate            %%%% change here
     {\let\NAT@last@nm=\NAT@nm\let\NAT@last@yr=\NAT@year
     \NAT@parse{\@citeb}%
     \ifNAT@longnames\@ifundefined{bv@\@citeb\@extra@b@citeb}{%
         \let\NAT@name=\NAT@all@names
         \global\@namedef{bv@\@citeb\@extra@b@citeb}{}}{}%
     \fi
     \ifNAT@full\let\NAT@nm\NAT@all@names\else
       \let\NAT@nm\NAT@name\fi
     \ifNAT@swa
       \c@lNAT@citex@swatrue
     \else
       \ifcase\NAT@ctype
         \if\relax\NAT@date\relax
           \@citea\hyper@natlinkstart{\@citeb\@extra@b@citeb}%
           \NAT@nmfmt{\NAT@nm}\hyper@natlinkend
         \else
           \ifx\NAT@last@nm\NAT@nm\NAT@yrsep
             \ifx\NAT@last@yr\NAT@year
               \hyper@natlinkstart{\@citeb\@extra@b@citeb}\NAT@exlab
               \hyper@natlinkend
             \else\unskip\
               \hyper@natlinkstart{\@citeb\@extra@b@citeb}\NAT@date
               \hyper@natlinkend
             \fi
           \else\@citea\hyper@natlinkstart{\@citeb\@extra@b@citeb}%
             \NAT@nmfmt{\NAT@nm}%
             \hyper@natlinkbreak{\ \NAT@@open\if*#1*\else#1\ \fi}%
                {\@citeb\@extra@b@citeb}%
             \NAT@date\hyper@natlinkend\fi
        \fi
       \or\@citea\hyper@natlinkstart{\@citeb\@extra@b@citeb}%
          \NAT@nmfmt{\NAT@nm}\hyper@natlinkend
       \or\@citea\hyper@natlinkstart{\@citeb\@extra@b@citeb}%
          \NAT@date\hyper@natlinkend
       \or\@citea\hyper@natlinkstart{\@citeb\@extra@b@citeb}%
          \NAT@alias\hyper@natlinkend
       \fi \if\relax\NAT@date\relax\def\@citea{\NAT@sep\ }%
           \else\def\@citea{\NAT@@close\NAT@sep\ }\fi
     \fi
     }}\ifNAT@swa\else\if*#2*\else\NAT@cmt#2\fi
    \if\relax\NAT@date\relax\else\NAT@@close\fi\fi}{#1}{#2}}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@laNATnocite}
% \begin{macro}{\nocite}
% A main document version of the natbib |\nocite|.
%    \begin{macrocode}
\newcommand\c@laNATnocite[1]{\@bsphack
  \@for\@citeb:=#1\do{%
    \edef\@citeb{\expandafter\@firstofone\@citeb}%
    \if@filesw\immediate\write\@mainaux{\string\citation{\@citeb}}\fi
    \if*\@citeb\else
    \@ifundefined{b@\@citeb\@extra@b@citeb}{%
       \NAT@citeundefined \PackageWarning{natbib}%
       {Citation `\@citeb' undefined}}{}\fi}%
  \@esphack}
\renewcommand{\nocite}[1]{\c@laNATnocite{#1}}

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\c@lbNATnocite}
% The local version pf |\nocite|.
%    \begin{macrocode}
\newcommand\c@lbNATnocite[1]{\@bsphack
  \@for\@citeb:=#1\do{%
    \edef\@citeb{\expandafter\@firstofone\@citeb}%
    \if@filesw\immediate\write\@auxout{\string\citation{\@citeb}}\fi
    \if*\@citeb\else
    \@ifundefined{B?\jobname?@\@citeb\@extra@b@citeb}{%
       \NAT@citeundefined \PackageWarning{natbib}%
       {Citation `\@citeb' undefined}}{}\fi}%
  \@esphack}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\NAT@wrout}
% Main version of the original |\NAT@wrout|.
%    \begin{macrocode}
\renewcommand{\NAT@wrout}[5]{%
  \if@filesw
    {\let\protect\noexpand\let~\relax
     \immediate
     \write\@mainaux{\string\bibcite{#5}{{#1}{#2}{{#3}}{{#4}}}}}\fi
\ignorespaces}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@lbNAT@wrout}
% Local version of the original |\NAT@wrout|.
%    \begin{macrocode}
\newcommand{\c@lbNAT@wrout}[5]{%
  \if@filesw
    {\let\protect\noexpand\let~\relax
     \immediate
     \write\@auxout{\string\bibcite{#5}{{#1}{#2}{{#3}}{{#4}}}}}\fi
\ignorespaces}

%    \end{macrocode}
% \end{macro}
%
%
%
% \begin{macro}{\c@laNAT@parse}
% \begin{macro}{\c@lbNAT@parse}
% Main and local versions of |\NAT@parse|.
%    \begin{macrocode}
\newcommand\c@laNAT@parse[1]{{%
     \let\protect=\@unexpandable@protect\let~\relax
     \let\active@prefix=\@gobble
     \xdef\NAT@temp{\csname b@#1\@extra@b@citeb\endcsname}}%
     \expandafter\NAT@split\NAT@temp?????@@%
     \expandafter\NAT@parse@date\NAT@date??????@@%
     \ifciteindex\NAT@index\fi}

\newcommand\c@lbNAT@parse[1]{{%
     \let\protect=\@unexpandable@protect\let~\relax
     \let\active@prefix=\@gobble
     \xdef\NAT@temp{\csname B?\jobname?@#1\@extra@b@citeb\endcsname}}%
     \expandafter\NAT@split\NAT@temp?????@@%
     \expandafter\NAT@parse@date\NAT@date??????@@%
     \ifciteindex\NAT@index\fi}

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\c@laNAT@lbibitem}
% \begin{macro}{\c@lbNAT@lbibitem}
% Main and local version of |\@lbibitem|.
%    \begin{macrocode}
\def\c@laNAT@lbibitem[#1]#2{%
  \if\relax\@extra@b@citeb\relax\else
    \@ifundefined{br@#2\@extra@b@citeb}{}{%
     \@namedef{br@#2}{\@nameuse{br@#2\@extra@b@citeb}}}\fi
   \@ifundefined{b@#2\@extra@b@citeb}{\def\NAT@num{}}{\NAT@parse{#2}}%
   \item[\hfil\hyper@natanchorstart{#2\@extra@b@citeb}\@biblabel{\NAT@num}%
    \hyper@natanchorend]%
    \NAT@ifcmd#1(@)(@)\@nil{#2}}

\def\c@lbNAT@lbibitem[#1]#2{%
  \if\relax\@extra@b@citeb\relax\else
    \@ifundefined{br@#2\@extra@b@citeb}{}{%
     \@namedef{br@#2}{\@nameuse{br@#2\@extra@b@citeb}}}\fi
   \@ifundefined{B?\jobname?@#2\@extra@b@citeb}{\def\NAT@num{}}{\NAT@parse{#2}}%
   \item[\hfil\hyper@natanchorstart{#2\@extra@b@citeb}\@biblabel{\NAT@num}%
    \hyper@natanchorend]%
    \NAT@ifcmd#1(@)(@)\@nil{#2}}

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\c@laNATbibcite}
% \begin{macro}{\c@lbNATbibcite}
% Main and local versions of |\NATbibcite|.
%    \begin{macrocode}
\newcommand\c@laNATbibcite[2]{\@ifundefined{b@#1\@extra@binfo}\relax
  {\NAT@citemultiple
  \PackageWarningNoLine{natbib}{Citation `#1' multiply defined}}%
  \global\@namedef{b@#1\@extra@binfo}{#2}}

\newcommand\c@lbNATbibcite[2]{\@ifundefined{B?\jobname?@#1\@extra@binfo}\relax
  {\NAT@citemultiple
  \PackageWarningNoLine{natbib}{Citation `#1' multiply defined}}%
  \global\@namedef{B?\jobname?@#1\@extra@binfo}{#2}}

\ifc@lonebib
  \ifc@lcombib
  \else
    \renewcommand\c@lbNATbibcite[2]{\@ifundefined{b@#1\@extra@binfo}\relax
      {\NAT@citemultiple
      \PackageWarningNoLine{natbib}{Citation `#1' multiply defined}}%
      \global\@namedef{B?\jobname?@#1\@extra@binfo}{#2}}
  \fi
\fi

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\c@laNAT@testdef}
% \begin{macro}{\c@lbNAT@testdef}
% Main and local versions of |\NAT@testdef|.
%    \begin{macrocode}
\newcommand\c@laNAT@testdef[2]{%
  \def\NAT@temp{#2}\expandafter \ifx \csname b@#1\@extra@binfo\endcsname
    \NAT@temp \else \ifNAT@swa \NAT@swafalse
       \PackageWarningNoLine{natbib}{Citation(s) may have
          changed.\MessageBreak
          Rerun to get citations correct}\fi\fi}

\newcommand\c@lbNAT@testdef[2]{%
  \def\NAT@temp{#2}\expandafter \ifx \csname B?\jobname?@#1\@extra@binfo\endcsname
    \NAT@temp \else \ifNAT@swa \NAT@swafalse
       \PackageWarningNoLine{natbib}{Citation(s) may have
          changed.\MessageBreak
          Rerun to get citations correct}\fi\fi}

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\c@laNAT@make@cite@list}
% \begin{macro}{\c@lbNAT@make@cite@list}
% Main and local versions of |\NAT@make@cite@list|.
%    \begin{macrocode}
\ifnum\NAT@sort>0
  \begingroup \catcode`\_=8
    \gdef\c@laNAT@make@cite@list{%
      \edef\@citeb{\expandafter\@firstofone\@citeb}%
      \@ifundefined{b@\@citeb\@extra@b@citeb}{\def\NAT@num{A}}%
      {\NAT@parse{\@citeb}}%
        \ifcat _\ifnum\z@<0\NAT@num _\else A\fi
       \@tempcnta\NAT@num \relax
       \ifnum \@tempcnta>\@tempcntb
          \edef\NAT@num@list{\NAT@num@list \@celt{\NAT@num}}%
          \edef\NAT@cite@list{\NAT@cite@list\@citeb,}%
          \@tempcntb\@tempcnta
       \else
          \let\NAT@@cite@list=\NAT@cite@list \def\NAT@cite@list{}%
          \edef\NAT@num@list{\expandafter\NAT@num@celt \NAT@num@list \@gobble @}%
          {\let\@celt=\NAT@celt\NAT@num@list}%
       \fi
    \else
       \edef\NAT@nonsort@list{\NAT@nonsort@list\@citeb,}%
 \fi}
 \endgroup

 \begingroup \catcode`\_=8
   \gdef\c@lbNAT@make@cite@list{%
     \edef\@citeb{\expandafter\@firstofone\@citeb}%
    \@ifundefined{B?\jobname?@\@citeb\@extra@b@citeb}{\def\NAT@num{A}}%
    {\NAT@parse{\@citeb}}%
      \ifcat _\ifnum\z@<0\NAT@num _\else A\fi
       \@tempcnta\NAT@num \relax
       \ifnum \@tempcnta>\@tempcntb
          \edef\NAT@num@list{\NAT@num@list \@celt{\NAT@num}}%
          \edef\NAT@cite@list{\NAT@cite@list\@citeb,}%
          \@tempcntb\@tempcnta
       \else
          \let\NAT@@cite@list=\NAT@cite@list \def\NAT@cite@list{}%
          \edef\NAT@num@list{\expandafter\NAT@num@celt \NAT@num@list \@gobble @}%
          {\let\@celt=\NAT@celt\NAT@num@list}%
       \fi
    \else
       \edef\NAT@nonsort@list{\NAT@nonsort@list\@citeb,}%
 \fi}
  \endgroup
\fi

%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% Some things are done at the end of a document.
%
%    \begin{macrocode}
\AtEndDocument{%
  \ifNAT@stdbst\if@filesw\immediate\write
    \@mainaux{\string\global\string\NAT@numberstrue}\fi\fi
  }

\AtEndDocument{\NAT@swatrue\let\bibcite\NAT@testdef}

%    \end{macrocode}
%
% \begin{macro}{\c@laNAT@set@cites}
% Main version of |\NAT@set@cites|.
%    \begin{macrocode}
\newcommand{\c@laNAT@set@cites}{\ifNAT@numbers
  \ifNAT@super \let\@cite\NAT@citesuper
      \def\NAT@mbox##1{\unskip\nobreak\hspace{1\p@}\textsuperscript{##1}}%
      \let\citeyearpar=\citeyear
      \let\NAT@space\relax\else
      \let\NAT@mbox=\mbox
      \let\@cite\NAT@citenum \def\NAT@space{ }\fi
    \let\@citex\NAT@citexnum
    \ifx\@biblabel\@empty\let\@biblabel\NAT@biblabelnum\fi
    \let\@bibsetup\NAT@bibsetnum
    \def\natexlab##1{}%
  \else
    \let\@cite\NAT@cite
    \let\@citex\NAT@citex
    \let\@biblabel\NAT@biblabel
    \let\@bibsetup\NAT@bibsetup
    \def\natexlab##1{##1}%
  \fi}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@lbNAT@set@cites}
% Local version of |\NAT@set@cites|.
%    \begin{macrocode}
\newcommand{\c@lbNAT@set@cites}{\ifNAT@numbers
  \ifNAT@super \let\@cite\NAT@citesuper
      \def\NAT@mbox##1{\unskip\nobreak\hspace{1\p@}\textsuperscript{##1}}%
      \let\citeyearpar=\citeyear
      \let\NAT@space\relax\else
      \let\NAT@mbox=\mbox
      \let\@cite\NAT@citenum \def\NAT@space{ }\fi
    \let\@citex\NAT@citexnum
    \ifx\@biblabel\@empty\let\@biblabel\NAT@biblabelnum\fi
    \let\@bibsetup\NAT@bibsetnum
    \def\natexlab##1{}%
  \else
    \let\@cite\NAT@cite
    \let\@citex\NAT@citex
    \let\@biblabel\NAT@biblabel
    \let\@bibsetup\NAT@bibsetup
    \def\natexlab##1{##1}%
  \fi}

%    \end{macrocode}
% \end{macro}
%
% For the main document, use |\c@la...| to replace the |\NAT...| definitions.
%    \begin{macrocode}
\let\NAT@parse\c@laNAT@parse
%%\let\nocite\c@laNATnocite
%%\let\NAT@wrout\c@laNAT@wrout
\let\@lbibitem\c@laNAT@lbibitem
\let\bibcite\c@laNATbibcite
\let\NAT@testdef\c@laNAT@testdef
%%\let\NAT@make@cite@list\c@laNAT@make@cite@list
%%\let\NAT@citexnum\c@laNAT@citexnum
%%\let\NAT@citex\c@laNAT@citex

%    \end{macrocode}
%
% And similarly for imported documents
%    \begin{macrocode}
\let\c@loldsetuppapers\setuppapers
\newcommand{\c@lNATsetuplocal}{%
  \let\NAT@parse\c@lbNAT@parse
  \let\nocite\c@lbNATnocite
  \let\NAT@wrout\c@lbNAT@wrout
  \let\@lbibitem\c@lbNAT@lbibitem
  \let\bibcite\c@lbNATbibcite
  \let\NAT@testdef\c@lbNAT@testdef
  \let\NAT@make@cite@list\c@lbNAT@make@cite@list
  \let\NAT@citexnum\c@lbNAT@citexnum
  \let\NAT@citex\c@lbNAT@citex
  \let\NAT@set@cites\c@lbNAT@set@cites
  \c@lbNAT@set@cites
}  
\renewcommand{\setuppapers}{%
  \c@loldsetuppapers 
  \ifc@lcombib
    \c@lNATsetuplocal
  \else
    \ifc@lonebib
    \else
      \c@lNATsetuplocal
    \fi
  \fi
}

%    \end{macrocode}
%
%
%    The end of this package
%    \begin{macrocode}
%</natpack>
%    \end{macrocode}
%
%
%
% \section{The \Lpack{combcite} package code} \label{citepackcode}
%
% This package calls the \Lpack{cite} package~\cite{CITE}
% and then makes some minor changes to some of its macro definitions.
% \changes{v0.63}{2003/11/09}{Added the combcite package}
%
%    \begin{macrocode}
%<*citepack>
%    \end{macrocode}
% The usual preliminaries. The \Lpack{cite} package is required
% and all options are passed to it to deal with.
%    \begin{macrocode}
\@ifclassloaded{combine}{}{%
  \PackageError{combcite}{The `combine' class is expected}{\@ehc}}
%    \end{macrocode}
% By definition, we need the \Lpack{cite} package, but first have
% to set up some option handling.
% \begin{macro}{\ifc@lbsuperopt}
% \cs{ifc@lbsuperopt} is a flag for if the \Lpack{cite} \Lopt{superscript}
% option has been used.
%    \begin{macrocode}
\newif\ifc@lbsuperopt
  \c@lbsuperoptfalse
%    \end{macrocode}
% \end{macro}
% Now do the options.
%    \begin{macrocode}
\DeclareOption{super}{\ExecuteOptions{superscript}}
\DeclareOption{superscript}{\c@lbsuperopttrue
                            \PassOptionsToClass{superscript}{cite}}
\ProcessOptions
%    \end{macrocode}
%
% We need the latest cite package (version 4.01 November 2003)
%    \begin{macrocode}
\RequirePackageWithOptions{cite}[2003/11/04]

%    \end{macrocode}
% Need special versions of various macros for imported papers,
% principally to handle writing to the .aux files.
% Indicate these by prepending `c@lb' to the name.
%
% \begin{macro}{\c@lbciten}
%    \begin{macrocode}
\DeclareRobustCommand\c@lbciten[1]{%
 \begingroup
  \let\@safe@activesfalse\@empty
%%  \c@lb@nocite{#1}% ignores spaces, writes to .aux file, returns #1 in \@no@sparg
  \@nocite{#1}% ignores spaces, writes to .aux file, returns #1 in \@no@sparg
  \@tempcntb\m@ne    % \@tempcntb tracks highest number
  \let\@h@ld\@empty  % nothing held from list yet
  \let\@citea\@empty % no punctuation preceding first
  \let\@celt\delimiter % an unexpandable, but identifiable, token
  \def\@cite@list{}% % empty list to start
  \@for \@citeb:=\@no@sparg\do{\c@lb@make@cite@list}% make a sorted list of numbers
  % After sorted citelist is made, execute it to compress citation ranges.
  \@tempcnta\m@ne    % no previous number
  \let\@celt\@compress@cite \@cite@list % output number list with compression
  \@h@ld % output anything held over
 \endgroup
 \@restore@auxhandle
 }

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@lb@make@cite@list}
%
%    \begin{macrocode}
\def\c@lb@make@cite@list{%
 \expandafter\let \expandafter\@B@citeB
          \csname B?\jobname?@\@citeb\@extra@b@citeb \endcsname
 \ifx\@B@citeB\relax % undefined: output ? and warning
    \@citea {\bfseries ?}\let\@citea\citepunct \G@refundefinedtrue
    \@warning {Citation `\@citeb' on page \thepage\space undefined}%
    \oc@verbo \global\@namedef{B?\jobname?@\@citeb\@extra@b@citeb}{?}%
 \else %  defined               % remove previous line to repeat warnings
    \ifcat _\ifnum\z@<0\@B@citeB _\else A\fi % a positive number, put in list
       \@addto@cite@list
    \else % citation is not a number, output immediately
       \@citea \citeform{\@B@citeB}\let\@citea\citepunct
 \fi\fi}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@lbcite}
% The revision to \cs{cite} depends on whether the \Lopt{superscript}
% option has been used.
%    \begin{macrocode}
\ifc@lbsuperopt
  \DeclareRobustCommand{\c@lbcite}{%
    \@ifnextchar[{\@tempswatrue\c@lb@citex}{\@tempswafalse\c@lb@citew}}
\else
  \DeclareRobustCommand{\c@lbcite}{%
    \@ifnextchar[{\@tempswatrue\c@lb@citex}{\@tempswafalse\c@lb@citex[]}}
\fi

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@lb@citex}
%
%    \begin{macrocode}
\def\c@lb@citex[#1]#2{\@cite{\c@lbciten{#2}}{#1}}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@lb@citew}
%
%    \begin{macrocode}
\def\c@lb@citew#1{\begingroup \leavevmode
  \@if@fillglue \lastskip \relax \unskip
  \def\@tempa{\@tempcnta\spacefactor
     \/% this allows the last word to be hyphenated, and it looks better.
     \@citess{\c@lbciten{#1}}\spacefactor\@tempcnta
     \endgroup \@restore@auxhandle}%
  \oc@movep\relax}% check for following punctuation (depending on options)

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@lbnocite}
%
%    \begin{macrocode}
\DeclareRobustCommand\c@lbnocite[1]{%
 \@bsphack \@nocite{#1}%
 \@for \@citeb:=\@no@sparg\do{\@ifundefined{B?\jobname?@\@citeb\@extra@b@citeb}%
    {\G@refundefinedtrue\@warning{Citation `\@citeb' undefined}%
    \oc@verbo \global\@namedef{B?\jobname?@\@citeb\@extra@b@citeb}{?}}{}}%
 \@esphack}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@nocite}
%
%    \begin{macrocode}
\def\@nocite#1{\begingroup\let\protect\string% normalize active chars
 \xdef\@no@sparg{\expandafter\@ignsp#1 \: }\endgroup% and remove ALL spaces
 \if@filesw \immediate\write\@newciteauxhandle % = \@auxout, except with multibib
    {\string\citation {\@no@sparg}}\fi
 }

%    \end{macrocode}
% \end{macro}
%
% Finally, add the revision to \cs{setuppapers}.
%    \begin{macrocode}
\g@addto@macro{\setuppapers}{\let\cite\c@lbcite}
\g@addto@macro{\setuppapers}{\let\citenum\c@lbciten}
\g@addto@macro{\setuppapers}{\let\citeonline\c@lbciten}

%    \end{macrocode}
%
%
%    The end of this package
%    \begin{macrocode}
%</citepack>
%    \end{macrocode}
%
%
%
% \appendix
% \section{Original code}
%
%    This section presents the original kernel code before modification.
%
%     The |\documentclass| macro is specified in \file{ltclass.dtx}.
% \par\begin{small}\begin{verbatim}
% \def\documentclass{%
%   \let\documentclass\@twoclasseserror
%   \if@compatability\else\let\usepackage\RequirePackage\fi
%   \@fileswithoptions\@clsextension}
% \@onlypreamble\documentclass
% \end{verbatim}
% \end{small}\par
%
%    The |document| environment is specified between \file{ltfiles.dtx} and
% \file{ltmiscen.dtx}. The |\document| command is given in \file{ltfiles.dtx}.
% \par\begin{small}\begin{verbatim}
% \def\document{\endgroup
%   \ifx\@unusedoptionlist\@empty\else
%     \@latex@warning@no@line{Unused global option(s):^^J%
%            \@spaces[\@unusedoptionlist]}%
%   \fi
%   \@colht\textheight
%   \@colroom\textheight \vsize\textheight
%   \columnwidth\textwidth
%   \@clubpenalty\clubpenalty
%   \if@twocolumn
%     \advance\columnwidth -\columnsep
%     \divide\columnwidth\tw@ \hsize\columnwidth \@firstcolumntrue
%   \fi
%   \hsize\columnwidth \linewidth\hsize
%   \begingroup\@floatplacement\@dblfloatplacement
%     \makeatletter\let\@writefile\@gobbletwo
%     \global \let \@multiplelabels \relax
%     \@input{\jobname.aux}%
%   \endgroup
%   \if@filesw
%     \immediate\openout\@mainaux\jobname.aux
%     \immediate\write\@mainaux{\relax}%
%   \fi
%   \process@table
%   \let\glb@currsize\@empty
%   \normalsize
%   \everypar{}%
%   \ifx\normalsfcodes\@empty
%     \ifnum\sfcode`\.=\@m
%       \let\normalsfcodes\frenchspacing
%     \else
%       \let\normalsfcodes\nonfrenchspacing
%     \fi
%   \fi
%   \@noskipsecfalse
%   \let \@refundefined \relax
%   \let\AtBeginDocument\@firstofone
%   \@begindocumenthook
%   \ifdim\topskip<1sp\global\topskip 1sp\relax\fi
%   \global\@maxdepth\maxdepth
%   \global\let\@begindocumenthook\@undefined
%   \ifx\@listfiles\@undefined
%     \global\let\@filelist\relax
%     \global\let\@addtofilelist\@gobble
%   \fi
%   \gdef\do##1{\global\let ##1\@notprerr}%
%   \@preamblecmds
%   \global\let \@nodocument \relax
%   \global\let\do\noexpand
%   \ignorespaces}
% \@onlypreamble\document
% \end{verbatim}
% \end{small}\par
%    The |\enddocument| macro is specified in \file{ltmiscen.dtx}.
% \par\begin{small}\begin{verbatim}
% \def\enddocument{%
%   \@enddocumenthook
%   \@checkend{document}%
%   \clearpage
%   \begingroup
%     \if@filesw
%       \immediate\closeout\@mainaux 
%       \let\@setckpt\@gobbletwo
%       \let\@newl@bel\@testdef
%       \@tempswafalse
%       \makeatletter \input\jobname.aux
%     \fi
%     \@dofilelist
%     \ifdim \font@submax >\fontsubfuzz\relax
%       \@font@warning{Size substitutions with differences\MessageBreak
%                  up to \font@submax\space have occured.\@gobbletwo}%
%     \fi
%     \@defaultsubs
%     \@refundefined
%     \if@filesw
%       \ifx \@multiplelabels \relax
%         \if@tempswa
%           \@latex@warning@no@line{Label(s) may have changed.
%               Rerun to get cross-references right}%
%         \fi
%       \else
%         \@multiplelabels
%       \fi
%     \fi
%   \endgroup
%   \deadcycles\z@\@@end}
% \end{verbatim}
% \end{small}\par
%
%    |\maketitle| is defined by each class. The following is from 
% \file{classes.dtx} for the \Lpack{book}, \Lpack{report} and \Lpack{article}
% classes.
% \par\begin{small}\begin{verbatim}
% \if@titlepage
%   \newcommand{\maketitle}{\begin{titlepage}%
%     \let\footnotesize\small
%     \let\footnoterule\relax
%     \let \footnote \thanks
%     \null\vfil
%     \vskip 60\p@
%     \begin{center}%
%       {\LARGE \@title \par}%
%       \vskip 3em%
%       {\large
%        \lineskip .75em%
%        \begin{tabular}[t]{c}%
%          \@author
%        \end{tabular}\par}%
%       \vskip 1.5em%
%       {\large \@date \par}%
%     \end{center}\par
%     \@thanks
%     \vfil\null
%     \end{titlepage}%
%     \setcounter{footnote}{0}%
%     \global\let\thanks\relax
%     \global\let\maketitle\relax
%     \global\let\@thanks\@empty
%     \global\let\@author\@empty
%     \global\let\@date\@empty
%     \global\let\@title\@empty
%     \global\let\title\relax
%     \global\let\author\relax
%     \global\let\date\relax
%     \global\let\and\relax
%   } % end titlepage \maketitle
% \else
%   \newcommand{\maketitle}{\par
%     \begingroup
%       \renewcommand\thefootnote{\@fnsymbol\c@footnote}%
%       \def\@makefnmark{\rlap{\@textsuperscript{\normalfont\@thefnmark}}}%
%       \long\def\@makefntext##1{\parindent 1em\noindent
%         \hb@xt@1.8em{%
%           \hss\@textsuperscript{\normalfont\@thefnmark}}##1}%
%       \if@twocolumn
%         \ifnum \col@number=\@ne
%           \@maketitle
%         \else
%           \twocolumn[\@maketitle]%
%         \fi
%       \else
%         \newpage
%         \global\@topnum\z@
%         \@maketitle
%       \fi
%       \thispagestyle{plain}\@thanks
%     \endgroup
%     \setcounter{footnote}{0}%
%     \global\let\thanks\relax
%     \global\let\maketitle\relax
%     \global\let\@maketitle\relax
%     \global\let\@thanks\@empty
%     \global\let\@author\@empty
%     \global\let\@date\@empty
%     \global\let\@title\@empty
%     \global\let\title\relax
%     \global\let\author\relax
%     \global\let\date\relax
%     \global\let\and\relax
%   } % end non-titlepage \maketitle
%
%   \def\@maketitle{%               
%     \newpage
%     \null
%     \vskip 2em%
%     \begin{center}%
%       \let \footnote \thanks
%       {\LARGE \@title \par}%
%       \vskip 1.5em%
%       {\large
%        \lineskip .5em%
%        \begin{tabular}[t]{c}%
%          \@author
%        \end{tabular}\par}%
%       \vskip 1em%
%       {\large \@date}%
%     \end{center}\par
%     \vskip 1.5em}
% \fi
% \end{verbatim}
% \end{small}\par
%
%    The definitions of |\title| and friends are in \file{ltsect.dtx}.
% \par\begin{small}\begin{verbatim}
% \def\title#1{\gdef\@title{#1}}
%   \def\@title{\@latex@error{No \noexpand\title given}\@ehc}
% \def\author#1{\gdef\@author{#1}}
%   \def\@author{\@latex@warning@no@line{No \noexpand\author given}}
% \def\date#1{\gdef\@date{#1}}
%   \gdef\@date{\today}
% \def\thanks#1{\footnotemark
%   \protected@xdef\@thanks{\@thanks
%     \protect\footnotetext[\the\c@footnote]{#1}}}
%   \let\@thanks\@empty
% \def\and{%                   % \begin{tabular}
%   \end{tabular}%
%   \hskip 1em \@plus.17fil%
%   \begin{tabular}[t]{c}}%    % \end{tabular}
% \end{verbatim}
% \end{small}\par
%
%    The definition of |\@starttoc| from \file{ltsect.dtx}.
% \par\begin{small}\begin{verbatim}
% \def\@starttoc#1{%
%   \begingroup
%     \makeatletter
%     \@input{\jobname.#1}%
%     \if@filesw
%       \expandafter\newwrite\csname tf@#1\endcsname
%       \immediate\openout \csname tf@#1\endcsname \jobname.#1\relax
%     \fi
%     \@nobreakfalse
%   \endgroup}
% \end{verbatim}
% \end{small}\par
%
%    The definition of |\@writefile| from \file{ltmiscen.dtx}.
% \par\begin{small}\begin{verbatim}
% \long\def@writefile#1#2{%
%   \@ifundefined{tf@#1}\relax
%     {\@temptokena{#2}%
%      \immediate\write\csname tf@#1\endcsname{\the\@temptokena}%
%     }}
% \end{verbatim}
% \end{small}\par
%
%    The definitions of |\addtocontents| and |addcontentsline|
% from \file{ltsect.dtx}.
% \par\begin{small}\begin{verbatim}
% \long\def\addtocontents#1#2{%
%   \protected@write\@auxout
%   {\let\label\@gobble \let\index\@gobble \let\glossary\@gobble}%
%   {\string\@writefile{#1}{#2}}}
% \def\addcontentsline#1#2#3{%
%   \addtocontents{#1}{\protect\contentsline{#2}{#3}{\thepage}}}
% \end{verbatim}
% \end{small}\par
%
%    The definitions of |\label|, |\@setref|, |\newlabel|, |\ref| and |\pageref|
% from \file{ltxref.dtx}.
% \par\begin{small}\begin{verbatim}
% \def\label#1{\@bsphack
%   \protected@write\@auxout{}%
%     {\string\newlabel{#1}{{\@currentlabel}{\thepage}}}%
%   \@esphack}
% \def\@setref#1#2#3{%
%   \ifx#1\relax
%     \protect\G@refundefinedtrue
%     \nfss@text{\reset@font\bfseries ??}%
%     \@latex@warning{Reference `#3' on page \thepage \space
%                     undefined}%
%   \else
%     \expandafter#2#1\null
%   \fi}
% \def\newlabel{\@newl@bel r}
% \def\ref#1{\expandafter\@setref\csname r@#1\endcsname
%             \@firstoftwo{#1}}
% \def\pageref#1{\expandafter\@setref\csname r@#1\endcsname
%                \@secondoftwo{#1}}
% \end{verbatim}
% \end{small}\par
%
%    The definitions of |\bibcite| and |\@citex| from \file{ltbibl.dtx}.
% \par\begin{small}\begin{verbatim}
% \def\bibcite{\@newl@bel b}
% \def\@citex[#1]#2{%
%   \let\@citea\@empty
%   \@cite{\@for\@citeb:=#2\do
%     {\@citea\def\@citea{,\penalty\@m\ }%
%      \edef\@citeb{\expandafter\@firstofone\@citeb\@empty}%
%      \if@filesw\immediate\write\@auxout{\string\citation{\@citeb}}\fi
%      \@ifundefined{b\@citeb}{\mbox{\reset@font\bfseries ?}%
%       \G@refundefinedtrue
%       \@latex@warning
%         {Citation `\@citeb' on page \thepage \space undefined}}%
%       {\hbox{\csname b\@citeb\endcsname}}}}{#1}}
% \end{verbatim}
% \end{small}\par
%
%
%
%
% \Finale
% \PrintIndex
%
\endinput

%% \CharacterTable
%%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
%%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
%%   Digits        \0\1\2\3\4\5\6\7\8\9
%%   Exclamation   \!     Double quote  \"     Hash (number) \#
%%   Dollar        \$     Percent       \%     Ampersand     \&
%%   Acute accent  \'     Left paren    \(     Right paren   \)
%%   Asterisk      \*     Plus          \+     Comma         \,
%%   Minus         \-     Point         \.     Solidus       \/
%%   Colon         \:     Semicolon     \;     Less than     \<
%%   Equals        \=     Greater than  \>     Question mark \?
%%   Commercial at \@     Left bracket  \[     Backslash     \\
%%   Right bracket \]     Circumflex    \^     Underscore    \_
%%   Grave accent  \`     Left brace    \{     Vertical bar  \|
%%   Right brace   \}     Tilde         \~}