% \iffalse
%
% Copyright (C) 1994 -- 2023 by Nederlandstalige TeX Gebruikersgroep.
% Based on letter.dtx version 1.3a
%
% Copyright (C) 1994 LaTeX3 project, Frank Mittelbach
% and Rainer Sch\"opf, all rights reserved.
%
% This file is part of the NTG document classes distribution
% ----------------------------------------------------------
%
% It 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.
% The latest version of this license is in
% http://www.latex-project.org/lppl.txt
% and version 1.3c or later is part of all distributions of LaTeX
% version 2008 or later.
%
% This work has the LPPL maintenance status "maintained".
%
% The Current Maintainer of this work is Johannes Braams.
%
% The list of all files belonging to the NTG document classes
% distribution is given in the file `manifest.txt.
%
% The list of derived (unpacked) files belonging to the distribution
% and covered by LPPL is defined by the unpacking scripts (with
% extension .ins) which are part of the distribution.
%
% \fi
% \CheckSum{2213}
% \iffalse
%
% \section{Identification}
%
% This document class can only be used with \LaTeXe, so we make
% sure that an appropriate message is displayed when another \TeX{}
% format is used.
% \begin{macrocode}
%<+brief>\NeedsTeXFormat{LaTeX2e}[1995/12/01]
% \end{macrocode}
%
% Announce the Class name and its version.
% \begin{macrocode}
%<+brief>\ProvidesClass{brief}
%<*driver>
\ProvidesFile{brief.drv}
%</driver>
[2023/01/10 v2.0s
%<+brief> NTG LaTeX document class]
% \end{macrocode}
%
% \section{The documentation driver file}
%
% We use the document class \cls{ltxdoc} which is also used to
% format the \LaTeXe\ documentation.
% \begin{macrocode}
%<*driver>
]
\documentclass{ltxdoc}
% \end{macrocode}
%
% We don't want everything to appear in the index.
% \changes{v2.0c}{1994/06/15}{Reordered DoNotIndex list}
% \changes{v2.0f}{1994/10/04}{Added a missing comma}
% \begin{macrocode}
\DoNotIndex{\@Alph,\@alph,\@arabic,\@badmath}
\DoNotIndex{\@centercr}
\DoNotIndex{\@empty,\@ignoretrue}
\DoNotIndex{\@ixpt}
\DoNotIndex{\@M,\@minus,\@ne,\@plus}
\DoNotIndex{\\,\addtolength}
\DoNotIndex{\advance}
\DoNotIndex{\ast,\begin,\begingroup,\bfseries,\bgroup,\box}
\DoNotIndex{\bullet}
\DoNotIndex{\cdot,\cr,\day,\DeclareOption}
\DoNotIndex{\def,\DocInput,\documentclass}
\DoNotIndex{\DoNotIndex,\egroup,\ifx,\else,\fi,\endtrivlist}
\DoNotIndex{\EnableCrossrefs,\end,\end@dblfloat,\end@float,\endgroup}
\DoNotIndex{\endlist,\everycr,\ExecuteOptions}
\DoNotIndex{\filedate,\filename,\fileversion}
\DoNotIndex{\global,\halign,\hangindent,\hbox,\hfil,\hfill,\hrule}
\DoNotIndex{\hsize,\hskip,\hspace,\hss,\ifcase,\or,\fi}
\DoNotIndex{\ifvmode,\ifnum,\fi,\fi,\input}
\DoNotIndex{\kern,\leavevmode,\let,\leftmark}
\DoNotIndex{\list,\llap,\long,\m@ne,\m@th,\mark}
\DoNotIndex{\month,\newcommand,\newcounter,\newenvironment}
\DoNotIndex{\NeedsTeXFormat,\newdimen}
\DoNotIndex{\newpage,\nobreak,\noindent,\number}
\DoNotIndex{\p@}
\DoNotIndex{\pagestyle,\par}
\DoNotIndex{\penalty,\PrintChanges,\PrintIndex,\ProcessOptions}
\DoNotIndex{\protect,\ProvidesClass,\raggedbottom,\raggedright}
\DoNotIndex{\refstepcounter,\relax,\renewcommand,\reset@font}
\DoNotIndex{\rightmargin,\rlap,\rmfamily}
\DoNotIndex{\roman,\setbox,\setcounter,\setlength}
\DoNotIndex{\skip,\slshape,\space}
\DoNotIndex{\trivlist,\typeout,\tw@}
\DoNotIndex{\vskip,\vspace,\year,\z@}
% \end{macrocode}
% We do want an index, using linenumbers.
% \changes{v2.0s}{2020/02/18}{Added \cs{CodelineIndex} to make sure a
% \texttt{.idx} file is produced}
% \begin{macrocode}
\EnableCrossrefs
\CodelineIndex
% \end{macrocode}
% Produce a listing of the changes.
% \begin{macrocode}
\RecordChanges
% \end{macrocode}
% We use so many \file{docstrip} modules that we set the
% \texttt{StandardModuleDepth} counter to 1.
% \begin{macrocode}
\setcounter{StandardModuleDepth}{1}
% \end{macrocode}
% The following command retrieves the date and version information
% from the file.
% \changes{v2.0c}{1994/06/15}{Removed remnant from \file{letter.dtx},
% now get the file info from \file{bief.dtx}}
% \begin{macrocode}
\GetFileInfo{brief.drv}
% \end{macrocode}
% Some commonly used abbreviations
% \begin{macrocode}
\newcommand*\Lopt[1]{\textsf{#1}}
\newcommand*\Lenv[1]{\textsf{#1}}
\newcommand*\file[1]{\texttt{#1}}
\newcommand*\cls[1]{\texttt{#1}}
\newcommand*\Lcount[1]{\textsl{\small#1}}
\newcommand*\pstyle[1]{\textsl{#1}}
% \end{macrocode}
% We also want the full details.
% \changes{v2.0c}{1994/06/15}{Removed another remnant of
% \file{letter.dtx}}
% \begin{macrocode}
\begin{document}
\DocInput{brief.dtx}
\PrintIndex
\PrintChanges
\end{document}
%</driver>
% \end{macrocode}
% \fi
%
% \changes{v2.0g}{1994/12/23}{Use \cs{newcommand*} instead of
% \cs{newcommand} in most places}
% \changes{v2.0l}{1995/08/10}{Use \cs{hb@xt@} instead of \cs{hbox}
% \texttt{to}}
% \changes{v2.0q}{1997/09/09}{Added a few more synonimes for commands}
% \changes{v2.0s}{2020/02/18}{Synchronised with the standard document
% classes}
%
%
% \author{Victor Eijkhout \and Johannes Braams}
%
% \title{NTG Document Class \texttt{brief} for \LaTeX{} version 2e}
%
%
% \maketitle
% \tableofcontents
%
% \section{Introduction}
%
% This file contains the document class \cls{brief} that was made
% available by Working Group 13 of the NTG (Nederlandstalige \TeX\
% Gebruikersgroep). It defines more commands than the standard
% document class \cls{letter}, but a letter made with the
% \cls{letter} document class is still processable with this
% document class.
%
% \StopEventually
%
% \section{Initial Code}
%
% In this part we define a few comands that are used later on.
%
% \begin{macro}{\@ptsize}
% This control sequence is used to store the second digit of the
% pointsize we are typesetting in. So, normally, it's value is one
% of 0, 1 or 2.
% \begin{macrocode}
%<*brief>
\newcommand*\@ptsize{}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\if@typhulp}
% This switch is used to decide whether or not to put a small line
% on the paper that is used to align the paper in a typewriter.
% \begin{macrocode}
\newif\if@typhulp
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\if@streepjes}
% A switch to indicate if the `folding lines' should be printed
% \begin{macrocode}
\newif\if@streepjes
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\if@adresrechts}
% This switch indicates if the addressing information is to be set
% on the left or on the right side of the letter.
% \begin{macrocode}
\newif\if@adresrechts
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\if@elfinch}
% A switch to remember whether we are using A4 or letter
% paper. (possibly obsolete)
% \begin{macrocode}
\newif\if@elfinch
% \end{macrocode}
% \end{macro}
%
%
% \subsection{Setting Paper Sizes}
%
% The variables |\paperwidth| and |\paperheight| should reflect the
% physical paper size after trimming. For desk printer output this
% is usually the real paper size since there is no post-processing.
% \begin{macrocode}
\DeclareOption{a4paper}
{\setlength\paperheight {297mm}%
\setlength\paperwidth {210mm}\@elfinchfalse}
\DeclareOption{a5paper}
{\ClassWarning{brief}{Paper size A5 not supported, using A4}%
\setlength\paperheight {297mm}%
\setlength\paperwidth {210mm}\@elfinchfalse}
\DeclareOption{b5paper}
{\ClassWarning{brief}{Paper size B5 not supported, using A4}%
\setlength\paperheight {297mm}%
\setlength\paperwidth {210mm}\@elfinchfalse}
\DeclareOption{letterpaper}
{\setlength\paperheight {11in}%
\setlength\paperwidth {8.5in}\@elfinchtrue}
\DeclareOption{USletter}
{\setlength\paperheight {11in}%
\setlength\paperwidth {8.5in}\@elfinchtrue}
\DeclareOption{legalpaper}
{\ClassWarning{brief}
{Paper size `legal' not supported, using `letter'}%
\setlength\paperheight {14in}%
\setlength\paperwidth {8.5in}\@elfinchtrue}
\DeclareOption{executivepaper}
{\ClassWarning{brief}
{Paper size `executive' not supported, using `letter'}%
\setlength\paperheight {10.5in}%
\setlength\paperwidth {7.25in}\@elfinchtrue}
% \end{macrocode}
%
%
% \subsection{Choosing the type size}
%
% The type size options are handled by defining |\@ptsize| to
% contain the last digit of the size in question and branching on
% |\ifcase| statements. This is done for historical reasons to stay
% compatible with other packages that use the |\@ptsize| variable
% to select special actions. It makes the declarations of size
% options less than 10pt difficult, although one can probably use
% \texttt{9} and \texttt{8} assuming that a class wont define both
% \Lopt{8pt} and \Lopt{18pt} options.
%
% \begin{macrocode}
\DeclareOption{10pt}{\renewcommand*\@ptsize{0}}
\DeclareOption{11pt}{\renewcommand*\@ptsize{1}}
\DeclareOption{12pt}{\renewcommand*\@ptsize{2}}
% \end{macrocode}
%
%
% \subsection{Two-side or one-side printing}
%
% Two-sided printing was not supported in the \LaTeX~2.09 version
% of this documentclass.
% \begin{macrocode}
\if@compatibility
\DeclareOption{twoside}{\@latexerr{No 'twoside' layout for letters}%
\@eha}
\else
\DeclareOption{twoside}{\@twosidetrue \@mparswitchtrue}
\fi
% \end{macrocode}
%
%
% \begin{macrocode}
\DeclareOption{oneside}{\@twosidefalse \@mparswitchfalse}
% \end{macrocode}
%
% \subsection{Draft option}
%
% If the user requests \Lopt{draft} we show any overfull boxes.
% We could probably add some more interesting stuff to this option.
% \begin{macrocode}
\DeclareOption{draft}{\setlength\overfullrule{5pt}}
\DeclareOption{final}{\setlength\overfullrule{0pt}}
% \end{macrocode}
%
%
% \subsection{Equation numbering on the left}
%
% The option \Lopt{leqno} can be used to get the equation numbers
% on the left side of the equation.
% \begin{macrocode}
\DeclareOption{leqno}{\input{leqno.clo}}
% \end{macrocode}
%
% \subsection{Flush left displays}
%
% The option \Lopt{fleqn} redefines the displayed math environmens
% in such a way that they come out flush left, with an indentation
% of |\mathindent| from the prevailing left margin.
% \begin{macrocode}
\DeclareOption{fleqn}{\input{fleqn.clo}}
% \end{macrocode}
%
% \subsection{Typewriter alignment}
%
% \begin{macrocode}
\DeclareOption{typhulp}{\@typhulptrue}
\DeclareOption{geentyphulp}{\@typhulpfalse}
% \end{macrocode}
% \subsection{Folding lines}
% It is possible to print `folding lines' on the far right side of
% the paper.
%
% \begin{macrocode}
\DeclareOption{streepjes}{\@streepjestrue}
\DeclareOption{geenstreepjes}{\@streepjesfalse}
% \end{macrocode}
%
% \subsection{Address placement}
% The address information can be put either on the left or on the
% right side of the letter
%
% \begin{macrocode}
\DeclareOption{adreslinks}{\@adresrechtsfalse}
\DeclareOption{adresrechts}{\@adresrechtstrue}
% \end{macrocode}
%
% \subsection{Support for different languages}
%
% In the original document style \cls{brief} the options to support
% the various languages were all dutch words. To be compatible with
% both the old version of the document class and with the
% recommended set of language options we have at least two options
% for each language.
%
% First Dutch,
% \begin{macrocode}
\DeclareOption{nederlands}{\AtEndOfClass{\dutchbrief}}
\DeclareOption{dutch} {\AtEndOfClass{\dutchbrief}}
% \end{macrocode}
% then British English,
% \begin{macrocode}
\DeclareOption{engels} {\AtEndOfClass{\englishbrief}}
\DeclareOption{english} {\AtEndOfClass{\englishbrief}}
% \end{macrocode}
% American English,
% \begin{macrocode}
\DeclareOption{USengels} {\AtEndOfClass{\americanbrief}}
\DeclareOption{american} {\AtEndOfClass{\americanbrief}}
% \end{macrocode}
% German
% \begin{macrocode}
\DeclareOption{duits} {\AtEndOfClass{\germanbrief}}
\DeclareOption{german} {\AtEndOfClass{\germanbrief}}
% \end{macrocode}
% and finally french.
% \begin{macrocode}
\DeclareOption{frans} {\AtEndOfClass{\frenchbrief}}
\DeclareOption{french} {\AtEndOfClass{\frenchbrief}}
\DeclareOption{francais} {\AtEndOfClass{\frenchbrief}}
% \end{macrocode}
%
% \section{Executing Options}
%
% Here we execute the default options to initialize certain
% variables.
% \begin{macrocode}
\ExecuteOptions{a4paper,11pt,oneside,onecolumn,final,%
geentyphulp,geenstreepjes,adreslinks,%
nederlands}
% \end{macrocode}
%
% The |\ProcessOptions| command causes the execution of the code
% for every option \Lopt{FOO}
% which is declared and for which the user typed
% the \Lopt{FOO} option in his
% |\documentclass| command. For every option \Lopt{BAR} he typed,
% which is not declared, the option is assumed to be a global option.
% All options will be passed as document options to any
% |\usepackage| command in the document preamble.
% \changes{v2.0h}{1994/12/30}{Added a \cs{relax} to prevent an
% incomplete \cs{ifcase} error}
% \begin{macrocode}
\ProcessOptions\relax
% \end{macrocode}
% Now that all the options have been executed we can define the
% user-level size changing commands. Their definition depends on
% which of the \Lopt{10pt}, \Lopt{11pt} or \Lopt{12pt} options was
% specified.
%
% \begin{macro}{\normalsize}
% \begin{macro}{\@normalsize}
%
% The user level command for the main size is |\normalsize|.
% Internally \LaTeX{} uses |\@normalsize| when it refers to the
% main size. |\@normalsize| will be defined to work like
% |\normalsize| if the latter is redefined from its default
% definition (that just issues an error message). Otherwise
% |\@normalsize| simply selects a 10pt/12pt size.
%
% The |\normalsize| macro also sets new values for\\
% |\abovedisplayskip|, |\abovedisplayshortskip| and
%
% \begin{macrocode}
\ifcase\@ptsize
\renewcommand*\normalsize{%
\@setfontsize\normalsize\@xpt\@xiipt
\abovedisplayskip 10\p@ \@plus2\p@ \@minus5\p@
\abovedisplayshortskip \z@ \@plus3\p@
\belowdisplayshortskip 6\p@ \@plus3\p@ \@minus3\p@
\belowdisplayskip \abovedisplayskip
\let\@listi\@listI}
\or
\renewcommand*\normalsize{%
\@setfontsize\normalsize\@xipt{13.6}%
\abovedisplayskip 11\p@ \@plus3\p@ \@minus6\p@
\abovedisplayshortskip \z@ \@plus3\p@
\belowdisplayshortskip 6.5\p@ \@plus3.5\p@ \@minus3\p@
\belowdisplayskip \abovedisplayskip
\let\@listi\@listI}
\or
\renewcommand*\normalsize{%
\@setfontsize\normalsize\@xiipt{15}%
\abovedisplayskip 12\p@ \@plus3\p@ \@minus7\p@
\abovedisplayshortskip \z@ \@plus3\p@
\belowdisplayshortskip 6.5\p@ \@plus3.5\p@ \@minus3\p@
\belowdisplayskip \abovedisplayskip
\let\@listi\@listI}
\fi
% \end{macrocode}
% Make |\@normalsize| a synonymn for |\normalsize|.
% \begin{macrocode}
\let\@normalsize\normalsize
% \end{macrocode}
%
% We initially choose the normalsize font.
% \begin{macrocode}
\normalsize
% \end{macrocode}
% We use |\MakeRobust| instead of |\DeclareRobustCommand| above to
% avoid a log entry for the redefinition.
% But if we are running in a rollback situation
% (prior to 2015) we don't touch it.
% \changes{v2.0s}{2020/02/18}{Roll back handling (gh/201)}
% \begin{macrocode}
\ifx\MakeRobust\@undefined \else
\MakeRobust\normalsize
\fi
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\small}
%
% This is similar to |\normalsize|.
% \changes{v2.0s}{2020/02/18}{Use \cs{DeclareRobustCommand} instead of
% \cs{newcommand*}}
% \begin{macrocode}
\ifcase\@ptsize
\DeclareRobustCommand\small{%
\@setfontsize\small\@ixpt{11}%
\abovedisplayskip 8.5\p@ \@plus3\p@ \@minus4\p@
\abovedisplayshortskip \z@ \@plus2\p@
\belowdisplayshortskip 4\p@ \@plus2\p@ \@minus2\p@
\belowdisplayskip \abovedisplayskip}
\or
\DeclareRobustCommand\small{%
\@setfontsize\small\@xpt\@xiipt
\abovedisplayskip 10\p@ \@plus2\p@ \@minus5\p@
\abovedisplayshortskip \z@ \@plus3\p@
\belowdisplayshortskip 6\p@ \@plus3\p@ \@minus3\p@
\belowdisplayskip \abovedisplayskip}
\or
\DeclareRobustCommand\small{%
\@setfontsize\small\@xipt{13.6}%
\abovedisplayskip 11\p@ \@plus3\p@ \@minus6\p@
\abovedisplayshortskip \z@ \@plus3\p@
\belowdisplayshortskip 6.5\p@ \@plus3.5\p@ \@minus3\p@
\belowdisplayskip \abovedisplayskip}
\fi
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\footnotesize}
%
% This is similar to |\normalsize|.
% \begin{macrocode}
\ifcase\@ptsize
\DeclareRobustCommand\footnotesize{%
\@setfontsize\footnotesize\@viiipt{9.5}%
\abovedisplayskip 6\p@ \@plus2\p@ \@minus4\p@
\abovedisplayshortskip \z@ \@plus\p@
\belowdisplayshortskip 3\p@ \@plus\p@ \@minus2\p@
\belowdisplayskip \abovedisplayskip}
\or
\DeclareRobustCommand\footnotesize{%
\@setfontsize\footnotesize\@ixpt{11}%
\abovedisplayskip 8\p@ \@plus2\p@ \@minus4\p@
\abovedisplayshortskip \z@ \@plus\p@
\belowdisplayshortskip 4\p@ \@plus2\p@ \@minus2\p@
\belowdisplayskip \abovedisplayskip}
\or
\DeclareRobustCommand\footnotesize{%
\@setfontsize\footnotesize\@xpt\@xiipt
\abovedisplayskip 10\p@ \@plus2\p@ \@minus5\p@
\abovedisplayshortskip \z@ \@plus3\p@
\belowdisplayshortskip 6\p@ \@plus3\p@ \@minus3\p@
\belowdisplayskip \abovedisplayskip}
\fi
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\scriptsize}
% \begin{macro}{\tiny}
% \begin{macro}{\large}
% \begin{macro}{\Large}
% \begin{macro}{\LARGE}
% \begin{macro}{\huge}
% \begin{macro}{\Huge}
% These are all much simpler than the previous macros, they just
% select a new fontsize, but leave the parameters for displays and
% lists alone.
% \begin{macrocode}
\ifcase\@ptsize
\DeclareRobustCommand\scriptsize{\@setfontsize\scriptsize\@viipt\@viiipt}
\DeclareRobustCommand\tiny{\@setfontsize\tiny\@vpt\@vipt}
\DeclareRobustCommand\large{\@setfontsize\large\@xiipt{14}}
\DeclareRobustCommand\Large{\@setfontsize\Large\@xivpt{18}}
\DeclareRobustCommand\LARGE{\@setfontsize\LARGE\@xviipt{22}}
\DeclareRobustCommand\huge{\@setfontsize\huge\@xxpt{25}}
\DeclareRobustCommand\Huge{\@setfontsize\Huge\@xxvpt{30}}
\or
\DeclareRobustCommand\scriptsize{\@setfontsize\scriptsize\@viiipt{9.5}}
\DeclareRobustCommand\tiny{\@setfontsize\tiny\@vipt\@viipt}
\DeclareRobustCommand\large{\@setfontsize\large\@xiipt{14}}
\DeclareRobustCommand\Large{\@setfontsize\Large\@xivpt{18}}
\DeclareRobustCommand\LARGE{\@setfontsize\LARGE\@xviipt{22}}
\DeclareRobustCommand\huge{\@setfontsize\huge\@xxpt{25}}
\DeclareRobustCommand\Huge{\@setfontsize\Huge\@xxvpt{30}}
\or
\DeclareRobustCommand\scriptsize{\@setfontsize\scriptsize\@viiipt{9.5}}
\DeclareRobustCommand\tiny{\@setfontsize\tiny\@vipt\@viipt}
\DeclareRobustCommand\large{\@setfontsize\large\@xivpt{18}}
\DeclareRobustCommand\Large{\@setfontsize\Large\@xviipt{22}}
\DeclareRobustCommand\LARGE{\@setfontsize\LARGE\@xxpt{25}}
\DeclareRobustCommand\huge{\@setfontsize\huge\@xxvpt{30}}
\let\Huge=\huge
\fi
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \section{Loading Packages}
%
% This class file does not load additional packages.
%
%
% \section{Document Layout}
% \label{sec:maincode}
%
% In this section we are finally dealing with the nasty typographical
% details.
%
% \subsection{Fonts}
%
% We use two fixed fonts in these letters.
%^^A possibly need to update for DC fonts in future?
% \begin{macrocode}
\newfont\refkopfont{cmssq8}
\DeclareFixedFont\kleinvet{\encodingdefault}%
{\rmdefault}%
{\bfdefault}%
{\shapedefault}%
{7}
% \end{macrocode}
% \subsection{Paragraphing}
%
% \begin{macro}{\lineskip}
% \begin{macro}{\normallineskip}
% These parameters control \TeX's behaviour when two lines tend to
% come too close together.
% \begin{macrocode}
\setlength\lineskip{1\p@}
\setlength\normallineskip{1\p@}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\baselinestretch}
% This is used as a multiplier for |\baselineskip|. The default is
% to {\em not\/} stretch the baselines.
% \begin{macrocode}
\renewcommand*\baselinestretch{}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\parskip}
% \begin{macro}{\parindent}
% |\parskip| gives extra vertical space between paragraphs and
% |\parindent| is the width of the paragraph indentation.
% Letters are typeset without paragraph indentation.
% \begin{macrocode}
\setlength\parskip{0.7em \@plus .3em \@minus .2em}
\setlength\parindent{0\p@}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@lowpenalty}
% \begin{macro}{\@medpenalty}
% \begin{macro}{\@highpenalty}
% The commands |\nopagebreak| and |\nolinebreak| put in penalties
% to discourage these breaks at the point they are put in.
% They use |\@lowpenalty|, |\@medpenalty| or |\@highpenalty|,
% dependant on their argument.
% \begin{macrocode}
\@lowpenalty 51
\@medpenalty 151
\@highpenalty 301
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\clubpenalty}
% \begin{macro}{\widowpenalty}
% These penalties are use to discourage club and widow lines.
% Because we use their default values we only show them here,
% commented out.
% \begin{macrocode}
% \clubpenalty 150
% \widowpenalty 150
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\displaywidowpenalty}
% \begin{macro}{\predisplaypenalty}
% \begin{macro}{\postdisplaypenalty}
% Discourage (but not so much) widows in front of a math display
% and forbid breaking directly in front of a display. Allow break
% after a display without a penalty. Again the default values are
% used, therefore we only show them here.
% \begin{macrocode}
% \displaywidowpenalty 50
% \predisplaypenalty 10000
% \postdisplaypenalty 0
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\interlinepenalty}
% Allow the breaking of a page in the middle of a paragraph.
% \begin{macrocode}
% \interlinepenalty 0
% \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\brokenpenalty}
% We allow the breaking of a page after a hyphenated line.
% \begin{macrocode}
% \brokenpenalty 0
% \end{macrocode}
% \end{macro}
%
%
% \subsection{Page Layout}
%
% All margin dimensions are measured from a point one inch from the
% top and lefthand side of the page.
%
% \subsubsection{Vertical spacing}
%
% \begin{macro}{\headheight}
% \begin{macro}{\headsep}
% The |\headheight| is the height of the box that will contain the
% running head. The |\headsep| is the distance between the bottom
% of the running head and the top of the text. |\topskip| is the
% |\baselineskip| for the first line on a page.
% \begin{macrocode}
\setlength\headheight{37mm}
\setlength\headsep {0mm}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\footskip}
% The distance from the baseline of the box which contains the
% running footer to the baseline of last line of text is controlled
% by the |\footskip|.
% Bottom of page:
% \begin{macrocode}
\setlength\footskip{25\p@}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\maxdepth}
% \begin{macro}{\@maxdepth}
% The \TeX\ primitive register |\maxdepth| has a function that is
% similar to that of |\topskip|. The register |\@maxdepth| should
% always contain a copy of |\maxdepth|. In both plain \TeX\ and
% \LaTeX~2.09 |\maxdepth| had a fixed value of \texttt{4pt}; in
% native \LaTeX2e\ mode we let the value depend on the typesize. We
% set it so that |\maxdepth| $+$ |\topskip| $=$ typesize $\times
% 1.5$. As it happens, in these classes |\topskip| is equal to the
% typesize, therefor we set |\maxdepth| to half the value of
% |\topskip|.
% \begin{macrocode}
\if@compatibility
\setlength\maxdepth{4\p@}
\else
\setlength\maxdepth{.5\topskip}
\fi
\setlength\@maxdepth\maxdepth
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsubsection{The dimension of text}
%
% \begin{macro}{\textwidth}
% \begin{macro}{\textheight}
% The dimensions of the text are fixed; they are defined in the
% \textsc{nen} norm which this class implements.
%
% \begin{macrocode}
\setlength\textwidth{144mm}
\setlength\textheight{197mm}
\if@elfinch \addtolength\textheight{-17.6mm} \fi
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\rightskip}
% \begin{macro}{\@rightskip}
%
% \begin{macrocode}
\setlength\@rightskip{0cm \@plus 5cm}
\setlength\rightskip{\@rightskip}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsubsection{Margins}
%
% \begin{macro}{\oddsidemargin}
% \begin{macro}{\evensidemargin}
% \begin{macro}{\marginparwidth}
% Again, these dimensions are based on the \textsc{nen} norm.
% \begin{macrocode}
\setlength\@tempdima{\paperwidth}
\addtolength\@tempdima{-2in}
\addtolength\@tempdima{-\textwidth}
\setlength\oddsidemargin {7.6mm}
\setlength\evensidemargin {\oddsidemargin}
\setlength\marginparwidth {0\p@}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\marginparsep}
% \begin{macro}{\marginparpush}
% The horizontal space between the main text and marginal notes is
% determined by |\marginparsep|, the minimum vertical separation
% between two marginal notes is controlled by |\marginparpush|.
% \begin{macrocode}
\setlength\marginparsep {0\p@}
\setlength\marginparpush{0\p@}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\topmargin}
% The |\topmargin| is the distance between the top of `the
% printable area' --which is 1 inch below the top of the paper--
% and the top of the box which contains the running head.
%
% \begin{macrocode}
\setlength\topmargin{-12.4mm}
% \end{macrocode}
% \end{macro}
%
% \subsubsection{The address field}
%
% The address information has to be put on a specific place.
%
% \begin{macro}{\vensterskip}
% \begin{macro}{\@vensterskip}
%
% \begin{macrocode}
\newdimen\vensterskip
\setlength\vensterskip{50mm}
\newdimen\@vensterskip
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsubsection{Changing head and text heights}
%
% This class has a much higher head on the first page of a letter
% than on subsequent pages.
%
% \begin{macro}{\@firstheadheight}
% \begin{macro}{\@otherheadheight}
% \begin{macro}{\@othertextheight}
% \begin{macro}{\@otherheadsep}
% \begin{macro}{\@vervolgsep}
%
% \begin{macrocode}
\newdimen\@firstheadheight
\newdimen\@otherheadheight
\newdimen\@othertextheight
\newdimen\@otherheadsep
\newdimen\@vervolgsep
\setlength\@otherheadsep{2mm}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@prepareerhoofden}
%
% \begin{macrocode}
\def\@prepareerhoofden{%
\setlength\@vensterskip{\vensterskip}%
\addtolength\@vensterskip{-50mm}%
\setlength\@firstheadheight{\headheight}%
\setlength\@otherheadheight{\headheight}%
\setlength\@othertextheight{\textheight}%
}
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Information in the foot}
%
% We also reserve some space at the bottom of the paper to print
% some information about the sender of the letter.
%
% \begin{macro}{\footsep}
% The distance between the text and this foot information
% \begin{macrocode}
\newdimen\footsep
\setlength\footsep{15mm}
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Footnotes}
%
% \begin{macro}{\footnotesep}
% |\footnotesep| is the height of the strut placed at the beginning
% of every footnote. It equals the height of a normal
% |\footnotesize| strut in this
% class, thus no extra space occurs between footnotes.
% \begin{macrocode}
\setlength\footnotesep{12\p@}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\footins}
% |\skip\footins| is the space between the last line of the main
% text and the top of the first footnote.
% \begin{macrocode}
\setlength{\skip\footins}{10\p@ \@plus 2\p@ \@minus 4\p@}
% \end{macrocode}
% \end{macro}
%
%
% \subsection{Page Styles}
%
% The page style \pstyle{foo} is defined by defining the command
% |\ps@foo|. This command should make only local definitions.
% There should be no stray spaces in the definition, since they
% could lead to mysterious extra spaces in the output (well, that's
% something that should be always avoided).
%
% \begin{macro}{\@evenhead}
% \begin{macro}{\@oddhead}
% \begin{macro}{\@evenfoot}
% \begin{macro}{\@oddfoot}
% The |\ps@...| command defines the macros |\@oddhead|,
% |\@oddfoot|, |\@evenhead|, and |\@evenfoot| to define the running
% heads and feet---e.g., |\@oddhead| is the macro to produce the
% contents of the heading box for odd-numbered pages. It is called
% inside an |\hbox| of width |\textwidth|.
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \subsubsection{Marking conventions}
%
% To make headings determined by the sectioning commands, the page
% style defines the commands |\chaptermark|, |\sectionmark|,
% \ldots, where |\chaptermark{|\meta{TEXT}|}| is called by
% |\chapter| to set a mark, and so on.
%
% The |\...mark| commands and the |\...head| macros are defined
% with the help of the following macros. (All the |\...mark|
% commands should be initialized to no-ops.)
%
% \LaTeX{} extends \TeX's |\mark| facility by producing two kinds
% of marks, a `left' and a `right' mark, using the following
% commands:
% \begin{flushleft}
% |\markboth{|\meta{LEFT}|}{|\meta{RIGHT}|}|: Adds both marks.
%
% |\markright{|\meta{RIGHT}|}|: Adds a `right' mark.
%
% |\leftmark|: Used in the |\@oddhead|, |\@oddfoot|, |\@evenhead|
% or |\@evenfoot| macros, it gets the current `left'
% mark. |\leftmark| works like \TeX's |\botmark|
% command.
%
% |\rightmark|: Used in the |\@oddhead|, |\@oddfoot|, |\@evenhead|
% or |\@evenfoot| macros, it gets the current
% `right' mark. |\rightmark| works like \TeX's
% |\firstmark| command.
% \end{flushleft}
%
% The marking commands work reasonably well for right marks
% `numbered within' left marks--e.g., the left mark is changed by a
% |\chapter| command and the right mark is changed by a |\section|
% command. However, it does produce somewhat anomalous results if
% two |\markboth|'s occur on the same page.
%
%
% Commands like |\tableofcontents| that should set the marks in some
% page styles use a |\@mkboth| command, which is |\let| by the
% pagestyle command (|\ps@...|) to |\markboth| for setting the
% heading or to |\@gobbletwo| to do nothing.
%
%
% \begin{macrocode}
% %%%\mark{{}{}} % Initializes TeX's marks <--- can vanish
% \end{macrocode}
%
% \subsubsection{Defining the page styles}
% \label{sec:pagestyle}
%
% The pagestyles \pstyle{empty} and \pstyle{plain} are defined in
% the \LaTeX{} kernel (\file{ltpage.dtx}), but these definitions
% are changed to a simpler version for this document class.
%
% \begin{macro}{\ps@headings}
% The definition of the page style \pstyle{headings} has to be
% different for two sided printing than it is for one sided
% printing.
%
% \begin{macrocode}
\if@twoside
\def\ps@headings{%
% \end{macrocode}
% The running feet contain some information about the sender of the
% letter. The feet aer the same for even and odd pages.
% \begin{macrocode}
\def\@oddfoot{\voetregel\hss}%
\let\@evenfoot\@oddfoot
% \end{macrocode}
% The running head contains some information about this letter. The
% head is the same for even and odd pages.
% \begin{macrocode}
\def\@oddhead{%
\vbox to \@otherheadheight
{\vervolghoofd\vfil
\if@streepjes\streepjes{\@firstheadheight}\fi}\hss}
\let\@evenhead\@oddhead}
% \end{macrocode}
% For one sided printing we don't need to define |\@evenhead| so
% the definition is somewhat simpler.
% \changes{v2.0e}{1994/07/12}{Removed a typo (\cs{othertheadheight})}
% \begin{macrocode}
\else
\def\ps@headings{%
\def\@oddfoot{\voetregel\hss}%
\def\@oddhead{%
\vbox to \@otherheadheight
{\vervolghoofd\vfil
\if@streepjes\streepjes{\@otherheadheight}\fi}\hss}}
\fi
% \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\ps@firstpage}
% On the first page the head contains much more than on other
% pages, therefore the height of the head and text need to be
% adapted.
% \begin{macrocode}
\def\ps@firstpage{%
\global\headheight=\@otherheadheight
\global\textheight=\@othertextheight %?? werkt dit ??
\global\headsep=\@otherheadsep
\def\@oddhead{\vbox to \@firstheadheight
{\briefhoofd\vfil
\if@streepjes\streepjes{\@firstheadheight}\fi}%
\hss}
\def\@evenhead{}
\def\@oddfoot{\voetregel\hss} \let\@evenfoot\@oddfoot}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ps@empty}
% The definition of the page style \pstyle{empty} is simple:
% No running head or foot at all.
% \begin{macrocode}
\def\ps@empty{%
\let\@oddfoot\@empty\let\@oddhead\@empty
\let\@evenfoot\@empty\let\@evenhead\@empty}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ps@plain}
% The definition of the page style \pstyle{plain} is again simple.
% \changes{v2.0l}{1995/08/10}{replace \cs{rmfamily} with
% \cs{normalfont} (PR 1578)}
% \begin{macrocode}
\def\ps@plain{%
\let\@oddhead\@empty
\def\@oddfoot{\normalfont\hfil\thepage}%
\def\@evenfoot{\normalfont\hfil\thepage}}
% \end{macrocode}
% \end{macro}
%
% \section{Document Markup}
%
% \subsection{Global Declarations}
%
% The following declarations, shown with examples, give information
% about the sender:
% \begin{itemize}
% \item |\name{Dr. L. User}| : to be used for the return address on
% the envelope.
% \item |\signature{Larry User}| : goes after the closing.
% \item |\address{3245 Foo St.\\Gnu York}| : used as the return
% address in the
% letter and on the envelope. If not declared, then an
% institutional standard address is used.
% \item |\location{Room 374}| : Acts as modifier to the standard
% institutional address.
% \item |\telephone{(415)123-4567}| : Just in case some style puts it
% on the letter.
% \end{itemize}
%
% \begin{macro}{\name}
% \begin{macro}{\fromname}
% \begin{macrocode}
\newcommand*\name[1]{\def\fromname{#1}}
\def\fromname{}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\ondertekening}
% \begin{macro}{\signature}
% \begin{macro}{\fromsig}
% This macro stores the signature.
% \changes{v2.0b}{1994/06/05}{Can't use (re)newcommand for
% \cs{fromsig} as that breaks the test against \cs{@empty}}
% \begin{macrocode}
\newcommand*\ondertekening[1]{\def\fromsig{#1}}
\def\fromsig{}
\let\signature\ondertekening
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\address}
% \begin{macrocode}
\newcommand*\address[1]{\maakbriefhoofd*{}{#1}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\location}
% \begin{macro}{\fromlocation}
% \begin{macrocode}
\newcommand*\location[1]{\def\fromlocation{#1}}
\def\fromlocation{}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \begin{macro}{\telephone}
% \begin{macro}{\telephonenum}
% \begin{macrocode}
\newcommand*\telephone[1]{\def\telephonenum{#1}}
\def\telephonenum{}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\makelabels}
% The |\makelabels| declaration causes mailing labels to be made.
% \begin{macrocode}
\newcommand*\makelabels{%
% \end{macrocode}
% At the beginning of the document, we need to activate the
% |\@mlabel| and |\@startlabels| commands, as well as write
% |\@startlabels| to the |.aux| file.
% \begin{macrocode}
\AtBeginDocument{%
\let\@startlabels\startlabels
\let\@mlabel\mlabel
\if@filesw
\immediate\write\@mainaux{\string\@startlabels}\fi}%
% \end{macrocode}
% At the end of the document we need to write |\clearpage| to the
% |.aux| file.
% \begin{macrocode}
\AtEndDocument{%
\if@filesw\immediate\write\@mainaux{\string\clearpage}\fi}}
% \end{macrocode}
% |\makelabels| is allowed only before the |\begin{document}|
% command.
% \begin{macrocode}
\@onlypreamble\makelabels
% \end{macrocode}
% \end{macro}
%
% \subsection{The generic letter commands}
%
% \begin{environment}{brief}
% The \Lenv{brief} environment creates a new letter, starting from
% page 1. (The first page is unnumbered.) It has a single
% argument, which is the adressee and his address, as in
%\begin{verbatim}
% \begin{brief}{Sam Jones \\
% Institute for Retarded Study\\
% Princeton, N.J.}
%\end{verbatim}
% Local declarations, such as |\address|, can follow the
% |\begin{brief}|.
% \begin{macrocode}
\newenvironment{brief}[1]
{\newpage
\if@twoside \ifodd\c@page
\else\thispagestyle{empty} \hbox{}\newpage\fi
\fi
\c@page\@ne
\interlinepenalty=200 % smaller than the TeXbook value
% \end{macrocode}
% The |\leavevmode| and |\ignorespaces| commands are there for
% protecting against an empty argument.
% \begin{macrocode}
\@processto{\leavevmode\ignorespaces #1}%
% \end{macrocode}
% Now we can start filling in the various fields in the references
% line. First the adressee.
% \begin{macrocode}
\@defrefveld{\@Ad}{\geadresseerdetekst}{\toname}
% \end{macrocode}
% Then the date. When nothing was specified we use |\vandaag|.
% \begin{macrocode}
\ifdim\wd\@Dt=0cm \@defrefveld{\@Dt}{\datumtekst}{\vandaag}\fi
% \end{macrocode}
% Now we can prepare the letterheads. It couldn't be done earlier
% because the user can specify that he uses a different kind of
% `window envelope'.
% \begin{macrocode}
\@prepareerhoofden
% \end{macrocode}
% We may need to adapt the height of the head and the text body on
% the following pages. Therefore we measure the height of the head
% on those pages.
% \begin{macrocode}
{\setbox\@tempboxa\vervolghoofd
\@tempdima\ht\@tempboxa
\advance\@tempdima by -\@otherheadheight
\ifdim\@tempdima>0\p@
\global\advance\@otherheadheight by \@tempdima
\global\advance\@othertextheight by -\@tempdima
\fi}
% \end{macrocode}
% We have to do the same for the foot of the letter.
% \begin{macrocode}
{\setbox\@tempboxa=\vbox{\voetregel}
\global\footskip=\ht\@tempboxa
\global\advance\footskip by \footsep}%
}
% \end{macrocode}
% The end of the environment possibly writes the address
% information on the \file{.aux} file.
% \changes{v2.0g}{1994/12/23}{No longer redefine \cs{protect} but use
% one of the available settings}
% \begin{macrocode}
{\stopletter\@@par\pagebreak\@@par
\if@filesw
\begingroup
\let\\=\relax
\let\protect\@unexpandable@protect
\immediate\write\@auxout
{\string\@mlabel{\returnaddress}{\toname\\\toaddress}}%
\endgroup
\fi}
% \end{macrocode}
% \end{environment}
%
% \begin{environment}{letter}
% The \Lenv{letter} environment is a synonime for the \Lenv{brief}
% environment, to provide compatibility with the standard
% \file{letter} document class.
% \begin{macrocode}
\let\letter\brief
\let\endletter\endbrief
% \end{macrocode}
% \end{environment}
%
% \begin{macro}{\@processto}
% \begin{macro}{\@xproc}
% \begin{macro}{\@yproc}
% |\@processto| gets the |\toname| and |\toaddress| from the letter
% environment's macro argument. |\@xproc| and |\@yproc| are auxiliary
% macros.
% \begin{macrocode}
\long\def\@processto#1{\@xproc #1\\@@@\ifx\toaddress\@empty
\else \@yproc #1@@@\fi}
\long\def\@xproc #1\\#2@@@{\def\toname{#1}\def\toaddress{#2}}
\long\def\@yproc #1\\#2@@@{\def\toaddress{#2}}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
%
% \begin{macro}{\antwoordadres}
% The command |\antwoordadres| takes the return address as an
% argument. The various parts of the address should be separated by
% |\\|, which will be turned into bullets.
% \begin{macrocode}
\newif\if@antwoordadres
\newcommand*\antwoordadres[1]{%
\@antwoordadrestrue\renewcommand*\@antwoordadres{#1}}
\newcommand*\@antwoordadres{}
\let\replyaddress\antwoordadres
% \end{macrocode}
% \end{macro}
%
% \subsubsection{The address window}
%
% The address for the letter will be placed in such a way that a
% `window envelope' can be used to send the letter.
%
% \begin{macro}{\adresveldbreedte}
% The width of the address window.
% \begin{macrocode}
\newdimen\adresveldbreedte
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\adresveld}
% This command formats the address window.
% \begin{macrocode}
\newcommand*\adresveld{%
\hbox{}\kern-\topskip
\kern\@vensterskip
\begingroup
% \end{macrocode}
% Compute the width of the address window
% \begin{macrocode}
\if@adresrechts
\setlength\adresveldbreedte{4\refveldbreedte}%
\addtolength\adresveldbreedte{-76mm}%
\def\@tempa{\moveright 76mm}%
\else
\let\@tempa\relax
\setlength\adresveldbreedte{83mm}%
\fi
% \end{macrocode}
% Store the address in a box.
% \changes{v2.0m}{1995/11/29}{Set both \cs{parskip} and \cs{parindent}
% to zero in \cs{adresveld}}
% \changes{v2.0n}{1996/04/01}{Repaired a typo (\cs{parksip})}
% \begin{macrocode}
\setbox\@tempboxa\vtop{%
\hsize\adresveldbreedte
\@normalsize
\parindent\z@\parskip\z@
\rightskip0\p@\@plus\adresveldbreedte
\let\\\@nobreakcr \toname \\ \toaddress}
% \end{macrocode}
% Format the return address if one was given.
% \changes{v2.0q}{1997/09/08}{Put \cs{textbullet} in a group to keep
% the font change local}
% \begin{macrocode}
{\baselineskip\z@\lineskip\z@
\if@antwoordadres
\@tempa\vbox to \z@{%
\hb@xt@\adresveldbreedte{%
\kleinvet
\def\\{\unskip\enspace{\textbullet}\enspace\ignorespaces}%
\@antwoordadres\hfil}
\kern2\p@\hrule \vss}
\fi
% \end{macrocode}
% Print a small rule as typing aid if required.
% \begin{macrocode}
\if@typhulp
\@tempa\llap{\vbox to \z@{\vskip9mm\streepje\vss}}
\fi
% \end{macrocode}
% And finally print the address information. Note that this way of
% position the box which contains the address information has the
% advantage that no matter how high or deep the box is, the
% following information will always be printed in the same spot on
% the paper.
% \begin{macrocode}
\kern9mm \kern-\ht\@tempboxa \@tempdima=\dp\@tempboxa
\@tempa\box\@tempboxa \kern-\@tempdima
\vskip31mm}\endgroup}
% \end{macrocode}
% \end{macro}
%
% \subsubsection{The reference line}
%
% \begin{macro}{\refveldbreedte}
% The width of the various fields in this line. It is determined in
% \textsc{nen}~\oldstylenums{3516}
% \begin{macrocode}
\newdimen\refveldbreedte
\setlength\refveldbreedte{38mm}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@defrefveld}
% A macro to help in defining the various fields.
% \begin{macrocode}
\def\@defrefveld#1#2#3{\setbox#1\@refveld{#2}{#3}}
% \end{macrocode}
% \begin{macro}{\@refveld}
% The macro |\@refveld| stores the formatted field in a box.
% \changes{v2.0m}{1995/11/29}{Also set \cs{parindent} to zero}
% \begin{macrocode}
\def\@refveld#1#2{%
\vtop{\hsize\refveldbreedte
\parskip\z@\parindent\z@
\everypar{}%
\lineskiplimit\z@\baselineskip12\p@
\lineskip\z@
\rightskip0\p@ \@plus \refveldbreedte \@minus .5\refveldbreedte
\vbox{\refkopfont\baselineskip10\p@#1\@@par}
\kern2\p@
\strut #2}}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@UB}
% \begin{macro}{\@UK}
% \begin{macro}{\@OK}
% \begin{macro}{\@Dt}
% We allocate four box registers to store the four fields in
% \begin{macrocode}
\newbox\@UB \newbox\@UK \newbox\@OK \newbox\@Dt
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\uwbriefvan}
% The command|\uwbriefvan| can be used to show the date of the
% letter to which your letter is an answer
% \begin{macrocode}
\newcommand*\uwbriefvan[1]{\@defrefveld{\@UB}{\uwbrieftekst}{#1}}
\let\yourletterof\uwbriefvan
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\uwkenmerk}
% The command |\uwkenmerk| can be used to show the reference of the
% letter to which your letter is an answer
% \begin{macrocode}
\newcommand*\uwkenmerk[1]{\@defrefveld{\@UK}{\uwkenmerktekst}{#1}}
\let\yourreference\uwkenmerk
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\onskenmerk}
% Store our reference in a box register.
% \begin{macrocode}
\newcommand*\onskenmerk[1]{\@defrefveld{\@OK}{\onskenmerktekst}{#1}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\datum}
% To store the date in a box register. When the user gives an empty
% argument no date will be printed. When he doesn't use |\datum| he
% will get today's date.
% \begin{macrocode}
\newcommand*\datum[1]{\def\@tempa{}\def\@tempb{#1}%
\ifx\@tempa\@tempb
\setbox\@Dt\hbox{ }%
\else
\@defrefveld{\@Dt}{\datumtekst}{#1}%
\fi}
\let\date\datum
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\referentieregel}
% This collects all the information for the reference line.
% \begin{macrocode}
\def\referentieregel{\hbox
{\hb@xt@\refveldbreedte{\copy\@UB\hfil}%
\hb@xt@\refveldbreedte{\copy\@UK\hfil}%
\hb@xt@\refveldbreedte{\copy\@OK\hfil}%
\hb@xt@\refveldbreedte{\copy\@Dt\hfil}\hss}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\vervolgreferentieregel}
% On the second and following pages a simple reference line can be
% printed. It contains the address information, the date and the
% page number.
% \begin{macro}{\@Ad}
% For this purpose we need to allocate another box register.
% \begin{macrocode}
\newbox\@Ad
% \end{macrocode}
% \end{macro}
%
% \begin{macrocode}
\def\vervolgreferentieregel{%
\hbox{%
\hb@xt@\refveldbreedte{\copy\@Ad\hfil}%
\hskip\refveldbreedte
\hb@xt@\refveldbreedte{\copy\@Dt\hfil}%
\@refveld{\bladnummertekst}{\thepage}\hss}}
% \end{macrocode}
% \end{macro}
%
% \subsubsection{The headers and footers}
%
% \begin{macro}{\briefhoofd}
% \begin{macro}{\vervolghoofd}
% The headings are empty by default.
% \begin{macrocode}
\newcommand*\briefhoofd{}
\newcommand*\vervolghoofd{\vbox{}}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\maakbriefhoofd}
% The usage of this command creates non-empty headers.
% \begin{macrocode}
\newcommand*\maakbriefhoofd
{\@ifstar {\@kortvervolgbriefhoofd}{\@langvervolgbriefhoofd}}
\let\makeheader\maakbriefhoofd
% \end{macrocode}
%
% \begin{macro}{\@kortvervolgbriefhoofd}
% This creates a shortened heading for following pages
% \begin{macrocode}
\newcommand*\@kortvervolgbriefhoofd[2]{%
\@maakbriefhoofd{#1}{#2}
\def\vervolghoofd{%
\vbox{\hsize=4\refveldbreedte
\hb@xt@\hsize{\Large \normalfont\sffamily #1\strut\hfil}
\hrule \kern2mm \vervolgreferentieregel}}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@langvervolgbriefhoofd}
% This creates a long heading for following pages by just using
% |\briefhoofd|.
% \begin{macrocode}
\newcommand*\@langvervolgbriefhoofd[2]{
\@maakbriefhoofd{#1}{#2}
\def\vervolghoofd{%
\vbox{\briefhoofd\vskip2mm
\vervolgreferentieregel
\vbox{}}}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@maakbriefhoofd}
% This was used in the two preceding macros; it defines
% |\briefhoofd|.
% \begin{macrocode}
\newcommand*\@maakbriefhoofd[2]{\def\briefhoofd{%
\vbox{\hsize=4\refveldbreedte
\hb@xt@\hsize{\Large \normalfont\sffamily #1\strut\hfil}
\hrule
\moveright 3\refveldbreedte\@refveld{\strut #2}{}
\vbox{}}}}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@voetruimte}
% A box to store the footer in.
% \begin{macrocode}
\newbox\@voetruimte
\setbox\@voetruimte=\hbox{}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@voetteller}
% We need to know how many items are placed in the footer.
% \begin{macrocode}
\newcount\@voetteller
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\voetregel}
% |\voetregel| just copies the box |\@voetruimte|.
% \begin{macrocode}
\newcommand*\voetregel{\copy\@voetruimte}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\voetitem}
% A command to add an information field to the footer.
% \begin{macrocode}
\newcommand*\voetitem[2]{%
\advance\@voetteller by 1
\setbox\@voetruimte\hb@xt@4\refveldbreedte{%
\unhbox\@voetruimte
\ifcase\@voetteller \relax \or \relax \or \hfil \else \hfill
\fi
\@refveld{#1}{#2}\hskip0\p@ \@plus 3\refveldbreedte}}
\let\footitem\voetitem
% \end{macrocode}
% \end{macro}
%
% \subsubsection{The little rules}
%
% \begin{macro}{\streepje}
% A shorthand for one little rule.
% \changes{v2.0q}{1997/09/09}{Make the `streepje's a little smaller}
% \begin{macrocode}
\newcommand*\streepje{\hb@xt@2mm{\rule{2mm}{.1pt}}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\streepjes}
% This prints the folding rules
% \begin{macrocode}
\newcommand*\streepjes[1]{%
\vbox to \z@{%
% \end{macrocode}
% We have to backup to a position 13mm below the edge of the paper.
% \begin{macrocode}
\kern-#1\relax
\hb@xt@\textwidth{%
% \end{macrocode}
% Then we can print a rule on the left side of the paper, half way
% down to align for a perforator.
% \begin{macrocode}
\llap{\perfstreepje\kern24mm}\hfill
% \end{macrocode}
% The folding rules are printed on the right hand side of the paper.
% \begin{macrocode}
\rlap{\kern24mm\vouwstreepjes}}
\vss}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\perfstreepje}
% Prints a |\streepje| halfway down the paper. A4 paper is 297 mm
% high; we start from a position 13mm below the edge of the paper.
% Hence the |\kern 135mm|.
% \begin{macrocode}
\newcommand*\perfstreepje{\vtop{\kern\z@ \kern 135mm \streepje}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\vouwstreepjes}
% This prints two folding rules.
% \changes{v2.0q}{1997/09/09}{Change the positioning of the
% `streepje's a little}
% \begin{macrocode}
\newcommand*\vouwstreepjes{%
\vtop{\kern\z@
\kern 95mm %% 108-13
\streepje %% denk maar dat dit geen dikte heeft
\kern 45mm %% 155-150
\streepje}}
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Page breaking control}
%
% \begin{macro}{\stopbreaks}
% \begin{macrocode}
\newcommand*\stopbreaks{\interlinepenalty \@M
\def\par{\@@par\nobreak}\let\\=\@nobreakcr
\let\vspace\@nobreakvspace}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@nobreakvspace}
% \changes{v2.0s}{2020/02/18}{Made robust (\LaTeX{} pr/2049)}
% \begin{macro}{\@nobreakvspacex}
% \begin{macro}{\@nobreakcr}
% \begin{macrocode}
\DeclareRobustCommand\@nobreakvspace
{\@ifstar{\@nobreakvspacex}{\@nobreakvspacex}}
% \end{macrocode}
%
% \begin{macrocode}
\def\@nobreakvspacex#1{%
\ifvmode
\nobreak\vskip #1\relax
\else
\@bsphack\vadjust{\nobreak\vskip #1}\@esphack
\fi}
% \end{macrocode}
%
% \changes{v2.0p}{1997/03/02}{Added setting of \cs{reserved@e} and
% \cs{reserved@f} as this is now needed for \LaTeX.}
% \begin{macrocode}
\def\@nobreakcr{%
\let\reserved@e\relax
\let\reserved@f\relax
\vadjust{\nobreak}\@ifstar{\@xnewline}{\@xnewline}}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\startbreaks}
% \begin{macrocode}
\def\startbreaks{\let\\=\@normalcr
\interlinepenalty 200\def\par{\@@par\penalty 200\relax}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\opening}
% Text is begun with the |\opening| command, whose argument
% generates the salutation, as in
%\begin{verbatim}
% \opening{Dear Henry,}
%\end{verbatim}
% This should produce everything up to and including the `Dear Henry,'
% and a \par command that follows. Since there's a |\vfil| at the
% bottom of every page, it can add vertical fil to position a
% short letter. It should use the following commands:
% \begin{itemize}
% \item |\toname| : name part of 'to' address.
% Will be one line long.
% \item |\toaddress| : address part of 'to' address.
% The lines separated by |\\|.
% \item |\fromname| : name of sender.
% \item |\fromaddress| : argument of current |\address|
% declaration--
% null if none. Should use standard institutional
% address if null.
% \item |\fromlocation| : argument of current |\location|
% declaration--null if none.
% \item |\telephonenum| : argument of current |\telephone|
% declaration--null if none.
% \end{itemize}
% \begin{macrocode}
\newcommand*\opening[1]{%
\thispagestyle{firstpage}%
\adresveld
\prevdepth=-1000\p@ \vskip-2\p@ %% ????
\referentieregel
\@dosubject #1\par\nobreak}
% \end{macrocode}
%
% \begin{macro}{\@dosubject}
% This prints the subject of the letter if one was specified.
% \begin{macrocode}
\def\@dosubject{%
\ifx\@empty\@subject
\else
\par\noindent
\parbox[t]{\textwidth}
{\@hangfrom{\refkopfont \betrefttekst \enspace}%
\normalfont\rmfamily\ignorespaces \@subject\strut}%
\par
\fi}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\afsluiting}
% \begin{macro}{\closing}
% The body of the letter follows, ended by a |\afsluiting| command,
% as in
%\begin{verbatim}
% \afsluiting{Yours truly,}
%\end{verbatim}
% This commands generates the closing matter, and the signature.
% An obvious thing to do is to use a |\parbox| for the closing
% and the signature. Should use the following:
% \begin{itemize}
% \item |\fromsig| : argument of current |\signature| declaration
% or, if null, the |\fromname|.
% \item |\stopbreaks| : a macro that inhibits page breaking.
% \end{itemize}
% \changes{v2.0k}{1995/06/01}{removed a \cs{noindent} which caused an
% anomalous space to appear in the output}
% \begin{macrocode}
\newcommand*\afsluiting[1]{\par\nobreak\vspace{\parskip}%
\stopbreaks
\ifx\@empty\fromsig
\def\ondertekening##1{\def\fromsig{##1}\@afsluiting{#1}}%
\else
\@afsluiting{#1}%
\fi}
\let\closing\afsluiting
\def\open@af{\vtop\bgroup\hsize.3\textwidth \raggedright}
% \end{macrocode}
% The internal command |\@afsluiting| takes care of printing the
% closing text.
% \changes{v2.0j}{1994/12/31}{Don't put an \cs{hbox} of \cs{textwidth}
% inside a \cs{parbox} of .5\cs{textwidth}}
% \changes{v2.0k}{1995/06/02}{inserted the \cs{noindent} which was
% removed from \cs{afsluiting}}
% \begin{macrocode}
\newcommand*\@afsluiting[1]{%
\def\en{\strut\egroup\open@af}%
\let\and\en
\noindent
\parbox{.5\textwidth}{%
\raggedright \ignorespaces #1\\[6\medskipamount]%
% \end{macrocode}
% \changes{v2.0q}{1997/09/09}{Added \cs{leavevmode} to get the
% signatures on one line}
% \begin{macrocode}
\leavevmode\open@af \fromsig \strut\egroup}}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\smallskipamount}
% \begin{macro}{\mdeskipamount}
% \begin{macro}{\bigskipamount}
% Of these three, only |\medskipmount| is actually used above.
% \begin{macrocode}
%\smallskipamount=.5\parskip
\medskipamount=\parskip
%\bigskipamount=2\parskip
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\betreft}
% \begin{macro}{\re}
% The command |\betreft| (|\re|) stores the subject of the letter.
% \changes{v2.0b}{1994/06/05}{Can't use (re)newcommand for
% \cs{@subject} as that breaks the test against \cs{@empty}}
% \begin{macrocode}
\newcommand*\betreft[1]{\def\@subject{#1}}
\let\onderwerp\betreft
\let\subject\betreft
\def\@subject{}
\let\re\betreft
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\cc}
% After the |\closing| you can put arbitrary stuff, which is typeset
% with zero |\parindent| and no page breaking. Commands designed
% for use after the closing are:
% \begin{verbatim}
% \cc{Tinker\\Evers\\Chance}
%\end{verbatim}
% which produces:\\
% \begin{tabular}{ll}
% cc: & Tinker\\
% & Evers\\
% & Chance
% \end{tabular}\\
% Note the obvious use of |\parbox|.
% \changes{v2.0l}{1995/08/10}{replace \cs{reset@font} with
% \cs{normalfont}; remove \cs{rm}}
% \begin{macrocode}
\newcommand*{\cc}[1]{\par\noindent
\parbox[t]{\textwidth}{\@hangfrom{\normalfont\ccname: }%
\ignorespaces #1\strut}\par}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\bijlage}
% \begin{macro}{\bijlagen}
% \begin{macro}{\encl}
%\begin{verbatim}
% \bijlagen{Foo(2)\\Bar}
%\end{verbatim}
% which produces:\\
% \begin{tabular}{ll}
% bijlagen: & Foo(2)\\
% & Bar
% \end{tabular}
% \changes{v2.0l}{1995/08/10}{replace \cs{reset@font} with
% \cs{normalfont}; remove \cs{rm}}
% \begin{macrocode}
\newcommand*\bijlage[1]{%
\par\noindent
\parbox[t]{\textwidth}{\@hangfrom{\normalfont\bijlagetekst\ }%
\ignorespaces #1\strut}\par}
\newcommand*\bijlagen[1]{%
\par\noindent
\parbox[t]{\textwidth}{\@hangfrom{\normalfont\bijlagentekst\ }%
\ignorespaces #1\strut}\par}
\let\encl\bijlagen
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\ps}
% The only thing |\ps| needs to do is call |\startbreaks|,
% which allows page breaking again.
% \begin{macrocode}
\newcommand*\ps{\par\startbreaks}
% \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\stopletter}
% The |\stopletter| command is called by |\endletter| to do the
% following:
% \begin{itemize}
% \item Add any desired fil or other material at the end of the
% letter.
% \item Define |\returnaddress| to be the return address for the
% mailing label.
% More precisely, it is the first argument of the |\mlabel|
% command described below. It should be defined to null if the
% return address doesn't appear on the labels. Any command,
% other than |\\|, that should not be expanded until the |\mlabel|
% command is actually executed must be preceded by |\protect|.
% Whenever possible, |\protect| commands in the definition of
% |\returnaddress|---it's much more efficient that way. In
% particular, when the standard return address is used, you
% should define |\returnaddress| to something like
% |\protect\standardreturnaddress|.
% \end{itemize}
% \begin{macrocode}
\newcommand*\stopletter{}
% \end{macrocode}
% \end{macro}
%
% \subsection{Customizing the labels}
%
% Commands for generating the labels are put on the .AUX file, which is
% read in and processed by the |\end{document}| command. You have to
% define the following two commands:
% \begin{itemize}
% \item
% |\startlabels| : Should reset the page layout parameters if
% necessary.
% \item
% |\mlabel|\marg{return address}\marg{to adress} : Command to
% generate a single label.
% \end{itemize}
%
%
%
% \begin{macro}{\returnaddress}
% \begin{macrocode}
\newcommand*\returnaddress{}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\labelcount}
% \begin{macrocode}
\newcount\labelcount
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\startlabels}
% The following |\startlabels| command sets things up for producing
% labels in two columns of five 2" $\times$ 4-1/4" labels each,
% suitable for reproducing onto Avery brand number 5352 address
% labels.
% \changes{v2.0l}{1995/08/10}{changed value of \cs{columnsep} by 1pt}
% \begin{macrocode}
\newcommand*\startlabels{\labelcount\z@
\pagestyle{empty}%
\let\@texttop\relax
\topmargin -50\p@
\headsep \z@
\oddsidemargin -35\p@
\evensidemargin -35\p@
\textheight 10in
\@colht\textheight \@colroom\textheight \vsize\textheight
\textwidth 550\p@
\columnsep 26\p@
\ifcase \@ptsize\relax
\normalsize
\or
\small
\or
\footnotesize
\fi
\baselineskip \z@
\lineskip \z@
\boxmaxdepth \z@
\parindent \z@
\twocolumn\relax}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@startlabels}
% |\@startlabels| is the command name that is written to the |.aux|
% file. It is a no-op at first, and defined to be the same as
% |\startlabels| in the |\begin{document}| hook.
% \begin{macrocode}
\let\@startlabels=\relax
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\mlabel}
% This command prints an address label; it is used when the user
% specified |\makelabels| in the preamble of his document. The
% command |\mlabel| takes two arguments; the second argument is
% supposed to be the address; the first argument can be used to
% print a return address. In this document class we ignore the
% first argument. Also the labels are supposed to be 2~inch high
% and 3.6~inch wide. When your address labels have a different
% width you will have to defined your own |\mlabel| command.
% \changes{v2.0g}{1994/12/23}{Redefined \cs{mlabel} to not use the
% \cs{setbox} primitive}
% \changes{v2.0l}{1995/08/10}{changed width of the labels slightly to
% prevent \LaTeX\ stuffing two on each line}
% \begin{macrocode}
\newcommand*\mlabel[2]{%
\parbox[b][2in][c]{262\p@}{\strut\ignorespaces #2}%
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@mlabel}
% |\@mlabel| is written to the \file{.aux} file in place of
% |\mlabel|. That allows to define it as a no-op per default, and
% activate it in the |\begin{document}| hook.
% \begin{macrocode}
\let\@mlabel=\@gobbletwo
% \end{macrocode}
% \end{macro}
%
%
% \subsection{Lists}
%
% \subsubsection{General List Parameters}
%
% The following commands are used to set the default values for the
% list environment's parameters. See the \LaTeX{} manual for an
% explanation of the meanings of the parameters. Defaults for the
% list environment are set as follows. First, |\rightmargin|,
% |\listparindent| and |\itemindent| are set to 0pt. Then, for a
% \texttt{K}th level list, the command |\@listK| is called, where
% `\texttt{K'} denotes `\texttt{i}', `\texttt{ii}', ... ,
% `\texttt{vi}'. (I.e., |\@listiii| is called for a third-level
% list.) By convention, |\@listK| should set |\leftmargin| to
% |\leftmarginK|.
%
% \begin{macro}{\leftmargin}
% \begin{macro}{\leftmargini}
% \begin{macro}{\leftmarginii}
% \begin{macro}{\leftmarginiii}
% \begin{macro}{\leftmarginiv}
% \begin{macro}{\leftmarginv}
% \begin{macro}{\leftmarginvi}
% For efficiency, level-one list's values are defined at top level,
% and |\@listi| is defined to set only |\leftmargin|.
% \begin{macrocode}
\setlength\leftmargini {2.5em}
% \end{macrocode}
% The following three are calculated so that they are larger than
% the sum of |\labelsep| and the width of the default labels (which
% are `(m)', `vii.' and `M.').
% \begin{macrocode}
\setlength\leftmarginii {2.2em}
\setlength\leftmarginiii {1.87em}
\setlength\leftmarginiv {1.7em}
\setlength\leftmarginv {1em}
\setlength\leftmarginvi {1em}
% \end{macrocode}
% Here we set the top level leftmargin.
% \begin{macrocode}
\setlength\leftmargin {\leftmargini}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\labelsep}
% \begin{macro}{\labelwidth}
% |\labelsep| is the distance between the label and the text of an
% item; |\labelwidth| is the width of the label.
% \begin{macrocode}
\setlength \labelsep {5\p@}
\setlength \labelwidth{\leftmargini}
\addtolength\labelwidth{-\labelsep}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\partopsep}
% When the user leaves a blank line before the environment an extra
% vertical space of |\partopsep| is inserted, in addition to
% |\parskip| and |\topsep|.
% \begin{macrocode}
\setlength\partopsep{0\p@}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\topsep}
% Extra vertical space, in addition to |\parskip|, added above and
% below list and paragraphing environments.
% \begin{macrocode}
\setlength\topsep{.4em}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@beginparpenalty}
% \begin{macro}{\@endparpenalty}
% These penalties are inserted before and after a list or paragraph
% environment. They are set to a bonus value to encourage page
% breaking at these points.
% \begin{macro}{\@itempenalty}
% This penalty is inserted between list items.
% \begin{macrocode}
\@beginparpenalty -\@lowpenalty
\@endparpenalty -\@lowpenalty
\@itempenalty -\@lowpenalty
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@listI}
% \begin{macro}{\@listi}
% |\@listI| defines top level and |\@listi| values of
% |\leftmargin|, |\parsep|, |\topsep|, and |\itemsep|
%
% These values have been taken from the ones in the document class
% \cls{artikel3}.
% \begin{macrocode}
\def\@listI{\leftmargin\leftmargini
\labelsep.5em%
\labelwidth\leftmargin
\advance\labelwidth-\labelsep
\topsep .5\parskip \@plus \p@
\parsep \z@
\itemsep\parsep}
\let\@listi\@listI
% \end{macrocode}
% We have to initialise these parameters.
% \begin{macrocode}
\@listi
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@listii}
% \begin{macro}{\@listiii}
% \begin{macro}{\@listiv}
% \begin{macro}{\@listv}
% \begin{macro}{\@listvi}
% Here are the same macros for the higher level lists.
% \begin{macrocode}
\def\@listii {\leftmargin\leftmarginii
\labelsep .5em%
\labelwidth\leftmarginii
\advance\labelwidth-\labelsep
\topsep -.5\parskip \@plus \p@
\parsep \z@
\itemsep\parsep}
\def\@listiii{\leftmargin\leftmarginiii
\labelsep .5em%
\labelwidth\leftmarginiii
\advance\labelwidth-\labelsep
\topsep -.5\parskip \@plus \p@
\parsep \z@
\partopsep \z@
\itemsep \topsep}
\def\@listiv {\leftmargin\leftmarginiv
\labelsep .5em%
\labelwidth\leftmarginiv
\advance\labelwidth-\labelsep
\topsep -.5\parskip \@plus \p@}
\def\@listv {\leftmargin\leftmarginv
\labelsep .5em%
\labelwidth\leftmarginv
\advance\labelwidth-\labelsep
\topsep -.5\parskip \@plus \p@}
\def\@listvi {\leftmargin\leftmarginvi
\labelsep .5em%
\labelwidth\leftmarginvi
\advance\labelwidth-\labelsep
\topsep -.5\parskip \@plus \p@}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \subsubsection{Enumerate}
%
% The enumerate environment uses four counters: \Lcount{enumi},
% \Lcount{enumii}, \Lcount{enumiii} and \Lcount{enumiv}, where
% \Lcount{enumN} controls the numbering of the Nth level
% enumeration.
%
% \begin{macro}{\theenumi}
% \begin{macro}{\theenumii}
% \begin{macro}{\theenumiii}
% \begin{macro}{\theenumiv}
% The counters are already defined in in the \LaTeX{} kernel
% (\file{ltlists.dtx}), but their representation is changed here.
%
% \begin{macrocode}
\renewcommand*\theenumi {\@arabic\c@enumi}
\renewcommand*\theenumii {\@alph\c@enumii}
\renewcommand*\theenumiii{\@roman\c@enumiii}
\renewcommand*\theenumiv {\@Alph\c@enumiv}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\labelenumi}
% \begin{macro}{\labelenumii}
% \begin{macro}{\labelenumiii}
% \begin{macro}{\labelenumiv}
% The label for each item is generated by the commands
% |\labelenumi| ... |\labelenumiv|.
% \begin{macrocode}
\newcommand*\labelenumi {\theenumi.}
\newcommand*\labelenumii {(\theenumii)}
\newcommand*\labelenumiii{\theenumiii.}
\newcommand*\labelenumiv {\theenumiv.}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\p@enumii}
% \begin{macro}{\p@enumiii}
% \begin{macro}{\p@enumiv}
% The expansion of |\p@enumN||\theenumN| defines the output of a
% |\ref| command when referencing an item of the Nth level of an
% enumerated list.
% \begin{macrocode}
\renewcommand*\p@enumii {\theenumi}
\renewcommand*\p@enumiii{\theenumi(\theenumii)}
\renewcommand*\p@enumiv {\p@enumiii\theenumiii}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \subsubsection{Itemize}
%
% \begin{macro}{\labelitemi}
% \begin{macro}{\labelitemii}
% \begin{macro}{\labelitemiii}
% \begin{macro}{\labelitemiv}
% Itemization is controlled by |\labelitemi|, |\labelitemii|,
% |\labelitemiii|, and |\labelitemiv|, which define the labels of
% the various itemization levels: the symbols used are bullet, bold
% en-dash, asterisk and centred dot.
%
% \changes{v2.0d}{1994/07/11}{renamed \cs{labelitemiiii} to
% \cs{labelitemiii}}
% \changes{v2.0o}{1996/09/23}{Changed \texttt{-{}-} to \cs{textendash}
% following \file{classes.dtx}}
% \changes{v2.0o}{1996/09/23}{Did similar for the bullet and centered
% dot.}
% \changes{v2.0p}{1997/03/02}{Now also \cs{textasteriskcentered}}
% \begin{macrocode}
\newcommand*\labelitemi {\labelitemfont \textbullet}
\newcommand*\labelitemii {\labelitemfont \bfseries \textendash}
\newcommand*\labelitemiii{\labelitemfont \textasteriskcentered}
\newcommand*\labelitemiv {\labelitemfont \textperiodcentered}
% \end{macrocode}
%
% \begin{macro}{\labelitemfont}
% The default definition for \cs{labelitemfont} is to reset the
% font to \cs{normalfont} so that always the same symbol is
% produced regardless of surrounding conditions.
%
% \changes{v2.0s}{2020/02/18}{Normalize label fonts}
% A possible alternative would be
%\begin{verbatim}
%\renewcommand\labelitemfont{%
% \fontseries\seriesdefault
% \fontshape\shapedefault\selectfont}
%\end{verbatim}
% which resets series and shape doesn't touch the family.
% \begin{macrocode}
\newcommand\labelitemfont{\normalfont}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \subsubsection{Description}
%
% \begin{environment}{description}
% The description environment is defined here -- while the itemize
% and enumerate environments are defined in the \LaTeX{} kernel
% (\file{ltlists.dtx}).
%
% \begin{macrocode}
\newenvironment{description}
{\list{}{\labelwidth\z@ \itemindent-\leftmargin
\let\makelabel\descriptionlabel}}
{\endlist}
% \end{macrocode}
% \end{environment}
%
% \begin{macro}{\descriptionlabel}
% To change the formatting of the label, you must redefine
% |\descriptionlabel|.
%
% \begin{macrocode}
\newcommand*\descriptionlabel[1]{\hspace\labelsep
\normalfont\bfseries #1}
% \end{macrocode}
% \end{macro}
%
% \subsection{Defining new environments}
%
% \subsubsection{Verse}
%
% \begin{environment}{verse}
% The verse environment is defined by making clever use of the
% list environment's parameters. The user types |\\| to end a line.
% This is implemented by |\let|'ing |\\| equal |\@centercr|.
%
% \begin{macrocode}
\newenvironment{verse}
{\let\\=\@centercr
\list{}{\setlength\itemsep{\z@}%
\setlength\itemindent{-15\p@}%
\setlength\listparindent{\itemindent}%
\setlength\rightmargin{\leftmargin}%
\addtolength\leftmargin{15\p@}}%
\item[]}
{\endlist}
% \end{macrocode}
% \end{environment}
%
% \subsubsection{Quotation}
%
% \begin{environment}{quotation}
% The quotation environment is also defined by making clever use of
% the list environment's parameters. The lines in the environment
% are set smaller than |\textwidth|. The first line of a paragraph
% inside this environment is indented.
%
% \begin{macrocode}
\newenvironment{quotation}
{\list{}{\setlength\listparindent{1.5em}%
\setlength\itemindent{\listparindent}%
\setlength\rightmargin{\leftmargin}}%
\item[]}
{\endlist}
% \end{macrocode}
% \end{environment}
%
% \subsubsection{Quote}
%
% \begin{environment}{quote}
% The quote environment is like the quotation environment except
% that paragraphs are not indented.
%
% \begin{macrocode}
\newenvironment{quote}
{\list{}{\setlength\rightmargin{\leftmargin}}%
\item[]}
{\endlist}
% \end{macrocode}
% \end{environment}
%
% \subsubsection{Theorem}
%
% This document class does not define it's own theorem environemts,
% the defaults, supplied by \LaTeX{} kernel (\file{ltthm.dtx}) are
% available.
%
% \subsection{Setting parameters for existing environments}
%
% \subsubsection{Array and tabular}
%
% \begin{macro}{\arraycolsep}
% The columns in an array environment are separated by
% 2|\arraycolsep|.
% \begin{macrocode}
\setlength\arraycolsep{5\p@}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\tabcolsep}
% The columns in an tabular environment are separated by
% 2|\tabcolsep|.
% \begin{macrocode}
\setlength\tabcolsep{6\p@}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\arrayrulewidth}
% The width of vertical rules in the array and tabular environments
% is given by |\arrayrulewidth|.
% \begin{macrocode}
\setlength\arrayrulewidth{.4\p@}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\doublerulesep}
% The space between adjacent rules in the array and tabular
% environments is given by |\doublerulesep|.
% \begin{macrocode}
\setlength\doublerulesep{2\p@}
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Tabbing}
%
% \begin{macro}{\tabbingsep}
% This controls the space that the |\'| command puts in. (See
% \LaTeX{} manual for an explanation.)
% \begin{macrocode}
\setlength\tabbingsep{\labelsep}
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Minipage}
%
% \begin{macro}{\@minipagerestore}
% The macro |\@minipagerestore| is called upon entry to a minipage
% environment to set up things that are to be handled differently
% inside a minipage environment. In the current styles, it does
% nothing.
% \end{macro}
%
% \begin{macro}{\@mpfootins}
% Minipages have their own footnotes; |\skip||\@mpfootins| plays
% same r\^ole for footnotes in a minipage as |\skip||\footins| does
% for ordinary footnotes.
%
% \begin{macrocode}
\skip\@mpfootins = \skip\footins
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Framed boxes}
%
% \begin{macro}{\fboxsep}
% The space left by |\fbox| and |\framebox| between the box and the
% text in it.
% \begin{macro}{\fboxrule}
% The width of the rules in the box made by |\fbox| and |\framebox|.
% \begin{macrocode}
\setlength\fboxsep{3\p@}
\setlength\fboxrule{.4\p@}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsubsection{Equation and eqnarray}
%
% \begin{macro}{\theequation}
% The equation counter will be typeset using arabic numbers.
% \begin{macrocode}
\renewcommand*\theequation{\@arabic\c@equation}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\jot}
% |\jot| is the extra space added between lines of an eqnarray
% environment. The default value is used.
% \begin{macrocode}
% \setlength\jot{3pt}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@eqnnum}
% The macro |\@eqnnum| defines how equation numbers are to appear in
% equations. Again the default is used.
%
% \begin{macrocode}
% \def\@eqnnum{(\theequation)}
% \end{macrocode}
% \end{macro}
%
% \subsection{Font changing}
%
% Here we supply the declarative font changing commands that were
% common in \LaTeX\ version 2.09 and earlier. These commands work
% in text mode \emph{and} in math mode. They are provided for
% compatiblity, but one should start using the |\text...| and
% |\math...| commands instead. These commands are redefined using
% |\@renewfontswitch|, a command with three arguments: the user
% command to be defined; \LaTeX\ commands to execute in text mode
% and \LaTeX\ commands to execute in math mode.
%
% \begin{macro}{\rm}
% \begin{macro}{\tt}
% \begin{macro}{\sf}
% The commands to change the family.
% \begin{macrocode}
\DeclareOldFontCommand{\rm}{\normalfont\rmfamily}{\mathrm}
\DeclareOldFontCommand{\sf}{\normalfont\sffamily}{\mathsf}
\DeclareOldFontCommand{\tt}{\normalfont\ttfamily}{\mathtt}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\bf}
% The command to change to the bold series. One should use
% |\mdseries| to explicitly switch back to medium series.
% \begin{macrocode}
\DeclareOldFontCommand{\bf}{\normalfont\bfseries}{\mathbf}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\sl}
% \begin{macro}{\it}
% \begin{macro}{\sc}
%
% And the commands to change the shape of the font. The slanted and
% small caps shapes are not available by default as math alphabets,
% so those changes do nothing in math mode. One should use
% |\upshape| to explicitly change back to the upright shape.
% \begin{macrocode}
\DeclareOldFontCommand{\it}{\normalfont\itshape}{\mathit}
\DeclareOldFontCommand{\sl}{\normalfont\slshape}{\relax}
\DeclareOldFontCommand{\sc}{\normalfont\scshape}{\relax}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\cal}
% \begin{macro}{\mit}
%
% The commands |\cal| and |\mit| should only be used in math mode,
% outside math mode they have no effect. Currently the New Font
% Selection Scheme defines these commands to generate warning
% messages. Therefore we have to define them `by hand'.
% \changes{v2.0g}{1994/12/23}{Now define \cs{cal} and \cs{mit} using
% \cs{DeclareRobustCommand*}}
% \begin{macrocode}
\DeclareRobustCommand*{\cal}{\@fontswitch{\relax}{\mathcal}}
\DeclareRobustCommand*{\mit}{\@fontswitch{\relax}{\mathnormal}}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsection{Footnotes}
%
% \begin{macro}{\footnoterule}
% Usually, footnotes are separated from the main body of the text
% by a small rule. This rule is drawn by the macro |\footnoterule|.
% We have to make sure that the rule takes no vertical space (see
% \file{plain.tex}) so we compensate for the natural heigth of the
% rule of 0.4pt by adding the right amount of vertical skip.
%
% To prevent the rule from colliding with the footnote we first add
% a little negative vertical skip, then we put the rule and make
% sure we end up at the same point where we begun this operation.
% \begin{macrocode}
\renewcommand*\footnoterule{%
\kern-\p@
\hrule \@width .4\columnwidth
\kern .6\p@}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c@footnote}
% Footnotes are numbered within chapters in the report and book
% document styles.
% \begin{macrocode}
% \newcounter{footnote}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@makefntext}
% The footnote mechanism of \LaTeX{} calls the macro |\@makefntext|
% to produce the actual footnote. The macro gets the text of the
% footnote as its argument and should use |\@makefnmark| to produce
% the mark of the footnote. The macro |\@makefntext| is called when
% effectively inside a |\parbox| of width |\columnwidth| (i.e.,
% with |\hsize| = |\columnwidth|).
%
% An example of what can be achieved is given by the following piece
% of \TeX\ code.
% \begin{verbatim}
% \long\def\@makefntext#1{%
% \@setpar{\@@par
% \@tempdima = \hsize
% \advance\@tempdima-10pt
% \parshape \@ne 10pt \@tempdima}%
% \par
% \parindent 1em\noindent
% \hb@xt@\z@{\hss\@makefnmark}#1}
% \end{verbatim}
% The effect of this definition is that all lines of the footnote
% are indented by 10pt, while the first line of a new paragraph is
% indented by 1em. To change these dimensions, just substitute the
% desired value for `10pt' (in both places) or `1em'. The mark is
% flushright against the footnote.
%
% In these document classes we use a simpler macro, in which the
% footnote text is set like an ordinary text paragraph, with no
% indentation except on the first line of a paragraph, and the
% first line of the footnote. Thus, all the macro must do is set
% |\parindent| to the appropriate value for succeeding paragraphs
% and put the proper indentation before the mark.
%
% \changes{v2.0q}{1997/09/08}{As we want to have different appearances
% of the footnotemarker in the text and in the footnotes, we can't
% use \cs{@makefnmark} here}
% \begin{macrocode}
\long\def\@makefntext#1{%
\noindent\hb@xt@\leftmargini{\normalfont\@thefnmark.\hfil}#1}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@makefnmark}
% The footnote markers that are printed in the text to point to the
% footnotes should be produced by the macro |\@makefnmark|.
% \changes{v2.0l}{1995/08/10}{No longer use hidden math}
% \changes{v2.0q}{1997/09/08}{Use the default definition for
% \cs{@makefnmark}}
% \begin{macrocode}
% \def\@makefnmark{\hb@xt@\leftmargini{\normalfont\@thefnmark.\hfil}}
% \end{macrocode}
% \end{macro}
%
% \subsection{Words}
%
% This document class supports a number of languages. All words
% that will be printed byu the class code are stored in commands
% which can be redefined if you want to use a different language.
%
% \begin{macro}{\dutchbrief}
% This stores dutch strings.
% \begin{macrocode}
\newcommand*\dutchbrief{%
\def\uwbrieftekst{Uw brief van}
\def\uwkenmerktekst{Uw kenmerk}
\def\onskenmerktekst{Ons kenmerk}
\def\datumtekst{Datum}
\def\geadresseerdetekst{Geadresseerde}
\def\bladnummertekst{Bladnummer}
\def\vandaag{\number\day~\ifcase\month\or
januari\or februari\or maart\or april\or mei\or juni\or juli\or
augustus\or september\or oktober\or november\or december\fi
\space \number\year}
\def\betrefttekst{Onderwerp:}
\def\ccname{cc}
\def\bijlagetekst{Bijlage:}
\def\bijlagentekst{Bijlagen:}
\def\telefoontekst{telefoon}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\englishbrief}
% This stores English strings.
% \changes{v2.0i}{1994/12/30}{Repaired typo}
% \begin{macrocode}
\newcommand*\englishbrief{%
\def\uwbrieftekst{Your letter of}
\def\uwkenmerktekst{Your reference}
\def\onskenmerktekst{Our reference}
\def\datumtekst{Date}
\def\geadresseerdetekst{To}
\def\bladnummertekst{Page}
\def\vandaag{\ifcase\day\or
1st\or 2nd\or 3rd\or 4th\or 5th\or
6th\or 7th\or 8th\or 9th\or 10th\or
11th\or 12th\or 13th\or 14th\or 15th\or
16th\or 17th\or 18th\or 19th\or 20th\or
21st\or 22nd\or 23rd\or 24th\or 25th\or
26th\or 27th\or 28th\or 29th\or 30th\or
31st\fi~\ifcase\month\or
January\or February\or March\or April\or May\or June\or
July\or August\or September\or October\or November\or December\fi
\space \number\year}
\def\betrefttekst{Re:}
\def\ccname{cc}
\def\bijlagetekst{Enclosure:}
\def\bijlagentekst{Enclosures:}
\def\telefoontekst{telephone}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\americanbrief}
% This stores American english strings
% \begin{macrocode}
\newcommand*\americanbrief{%
\def\uwbrieftekst{Your letter of}
\def\uwkenmerktekst{Your reference}
\def\onskenmerktekst{Our reference}
\def\datumtekst{Date}
\def\geadresseerdetekst{To}
\def\bladnummertekst{Page}
\def\vandaag{\ifcase\month\or
January\or February\or March\or April\or May\or June\or
July\or August\or September\or October\or November\or December\fi
\space\number\day, \number\year}
\def\betrefttekst{Re:}
\def\ccname{cc}
\def\bijlagetekst{Enclosure:}
\def\bijlagentekst{Enclosures:}
\def\telefoontekst{telephone}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\germanbrief}
% This stores the German versions of the strings.
% \begin{macrocode}
\newcommand*\germanbrief{%
\def\uwbrieftekst{Ihr Brief vom}
\def\uwkenmerktekst{Ihr Zeichen}
\def\onskenmerktekst{Unser Zeichen}
\def\datumtekst{Datum}
\def\geadresseerdetekst{An}
\def\bladnummertekst{Seite}
\def\vandaag{\number\day.~\ifcase\month\or
Januar\or Februar\or M\"arz\or April\or Mai\or Juni\or
Juli\or August\or September\or Oktober\or November\or Dezember\fi
\space\number\year}
\def\betrefttekst{Betrifft:}
\def\ccname{Kopien an}
\def\bijlagetekst{Anlage:}
\def\bijlagentekst{Anlagen:}
\def\telefoontekst{Telefon}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\frenchbrief}
% And finally to store the french strings
% \begin{macrocode}
\newcommand*\frenchbrief{%
\def\uwbrieftekst{Votre lettre du}
\def\uwkenmerktekst{Vos r\'ef\'erences:}
\def\onskenmerktekst{Nos r\'ef\'erences:}
\def\datumtekst{Date:}
\def\geadresseerdetekst{\`A l'attention de}
\def\bladnummertekst{Page}
\def\vandaag{\number\day\ifnum\day=1$^{er}$\fi
~\ifcase\month\or janvier\or
f\'evrier\or mars\or avril\or mai\or juin\or
juillet\or ao\^ut\or septembre\or octobre\or
novembre\or d\'ecembre\fi \space \number\year}
\def\betrefttekst{Objet:}
\def\ccname{Copie \`a}
\def\bijlagetekst{Pi\`ece jointe:}
\def\bijlagentekst{Pi\`eces jointes:}
\def\telefoontekst{T\'el\'ephone:}}
% \end{macrocode}
% \end{macro}
%
% \subsection{Two column mode}
%
% \begin{macro}{\columnsep}
% This gives the distance between two columns in two column mode.
% \begin{macrocode}
\setlength\columnsep{10\p@}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\columnseprule}
% This gives the width of the rule between two columns in two
% column mode. We have no visible rule.
% \begin{macrocode}
\setlength\columnseprule{0\p@}
% \end{macrocode}
% \end{macro}
%
% \subsection{The page style}
% We have \pstyle{headings} pages in this document class by
% default. We use arabic pagenumbers.
% \begin{macrocode}
\pagestyle{headings}
\pagenumbering{arabic}
% \end{macrocode}
%
% \subsection{Single or double sided printing}
%
% We don't try to make each page as long as all the others.
% \begin{macrocode}
\raggedbottom
% \end{macrocode}
%
% \begin{macro}{\@texttop}
% The document class \cls{letter} sets |\@texttop| to |\vskip| 0pt
% \texttt{plus} .00006fil on the first page of a letter, which
% centers a short letter on the page. This class however doesn't
% want the letter to be centered on the page.
% \begin{macrocode}
\let\@texttop\relax
% \end{macrocode}
% \end{macro}
%
% We always start in one column mode.
% \begin{macrocode}
\onecolumn
%</brief>
% \end{macrocode}
%
%
%
% \Finale
%
\endinput