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% Copyright (c) Markus Kohm, 2002-2019
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% Chapter about scrlttr2 of the KOMA-Script guide expert part
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% Kapitel ueber scrlttr2 im Experten-Teil der KOMA-Script-Anleitung
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\KOMAProvidesFile{scrlttr2-experts.tex}
                 [$Date: 2019-10-10 09:50:23 +0200 (Thu, 10 Oct 2019) $
                  KOMA-Script guide (chapter: scrlttr2 for experts)]

\translator{Harald Bongartz\and Georg Grandke\and Raimund Kohl\and Jens-Uwe
  Morawski\and Stephan Hennig\and Gernot Hassenpflug\and Markus Kohm\and
  Karl Hagen}

% Date of the translated German file: 2019-10-09

\chapter{Additional Information about the \Class{scrlttr2} Class and the
 \Package{scrletter} Package}
\labelbase{scrlttr2-experts}

\BeginIndexGroup
\BeginIndex{Class}{scrlttr2}
This chapter provides additional information about the \KOMAScript{} class
\Class{scrlttr2}. \iffree{Some parts of the chapter are found only in the
  German \KOMAScript{} book \cite{book:komascript}. This should not be a
  problem, because the}{The} average user, who only wants to use the class
or package, will not normally need this information. Part of this information
is addressed to users for whom the default options are insufficient. Thus,
for example, the first section describes in detail the pseudo-lengths that
specify the letterhead page and which can be used be used to modify the its
layout.%
\iffalse% Es wird Zeit das komplett rauszuwerfen!
  In addition, this chapter also describes features that exist only to
  provide compatibility with the deprecated \Class{scrlettr} class. It also
  explains in detail how to convert a document from this obsolete class
  to the current  class.
\fi

\BeginIndex{Package}{scrletter}%
Starting with \KOMAScript~3.15\ChangedAt[2014/11]{v3.15}{\Package{scrletter}},
you can use the \Package{scrletter} package with one of the \KOMAScript{}
classes \Class{scrartcl}, \Class{scrreprt}, or \Class{scrbook}. It provides
nearly all the features of \Class{scrlttr2} for those classes. There are,
however, a few differences described later in this chapter.%


\section{Pseudo-Lengths for Experienced Users}
\seclabel{pseudoLengths}
\BeginIndexGroup
\BeginIndex{}{pseudo-lengths}

\TeX{} works with a fixed number of registers. There are registers for tokens,
for boxes, for counters, for skips, and for dimensions. Overall there are 256
registers for each of these categories. For \LaTeX{} lengths, which are
defined with \Macro{newlength}, skip registers are used. Once all these
registers are in use, you can not define any more lengths. Both
\Class{scrlttr2} and \Package{scrletter} would normally use more than 20 of
these registers for the first page alone. \LaTeX{} itself already uses 40 of
these registers. The \hyperref[cha:typearea]{\Package{typearea}}%
\IndexPackage{typearea} package needs some of them too; thus, approximately a
quarter of these precious registers would already be in use. For this reason,
\KOMAScript{} stores letter-specific lengths in macros instead of lengths. The
drawback of this approach is that computations with macros are somewhat more
complicated than with real lengths.

Note\textnote{Attention!} that even though these pseudo-lengths are internally
implemented as macros, the commands for pseudo-length management expect only
the names of the pseudo-lengths not the macros representing the
pseudo-lengths. The names of pseudo-lengths are written without the initial
backslash, like the names of \LaTeX{} counters and unlike macros or \LaTeX{}
lengths.

Anyone who wants to argue that the recommended \LaTeX{} installation with
\eTeX{}, which is required for \KOMAScript{} anyway, no longer suffers from
the above-mentioned limitation would be right. However, that improvement came
too late for \Class{scrlttr2}. With \Package{scrletter}, the concept of
psuedo-lengths was adopted for reasons of compatibility.

The pseudo-lengths defined and uses by \KOMAScript{} are listed in
\autoref{tab:scrlttr2-experts.pseudoLength}, which also provides cross
references to the detailed descriptions of each pseudo-lengths in the
following sub-sections.

A schematic display of the most important distances of the letterhead page is
shown in \autoref{fig:scrlttr2-experts.pseudoLength} on
\autopageref{fig:scrlttr2-experts.pseudoLength}. In addition to the
pseudo-lengths for the configurable distances, some non-configurable lengths
are also shown in light gray. For the sake of clarity, however, some rarely
required pseudo-lengths have been omitted.
%
\begin{desclist}
  \renewcommand{\abovecaptionskipcorrection}{-\normalbaselineskip}%
  \desccaption{%
    Pseudo-lengths provided by \Class{scrlttr2} and \Package{scrletter}%
    \label{tab:scrlttr2-experts.pseudoLength}%
  }{%
    Pseudo-lengths provided by \Class{scrlttr2} and \Package{scrletter}
    (\emph{continued})%
  }%
  \pentry{backaddrheight}{%
    the height of the return address at the upper edge of the address field
    (\autoref{sec:scrlttr2-experts.addressee},
    \DescPageRef{scrlttr2-experts.plength.backaddrheight})%
  }%
  \pentry{bfoldmarklength}{%
    the length of the bottommost fold mark
    (\autoref{sec:scrlttr2-experts.foldmarks},
    \DescPageRef{scrlttr2-experts.plength.bfoldmarkvpos})%
  }%
  \pentry{bfoldmarkvpos}{%
    the vertical distance of the bottommost fold mark from the top edge of the
    paper (\autoref{sec:scrlttr2-experts.foldmarks},
    \DescPageRef{scrlttr2-experts.plength.bfoldmarkvpos})%
  }%
  \pentry{firstfoothpos}{%
    the horizontal distance of the letterhead page footer from the left edge
    of the paper; values greater than the width of the paper or less than the
    negative value of the width of the paper activate special handling %
    (\autoref{sec:scrlttr2-experts.firstFoot},
    \DescPageRef{scrlttr2-experts.plength.firstfoothpos})%
  }%
  \pentry{firstfootvpos}{%
    the vertical distance of letterhead page footer from the top edge of the
    paper (\autoref{sec:scrlttr2-experts.firstFoot},
    \DescPageRef{scrlttr2-experts.plength.firstfootvpos})%
  }%
  \pentry{firstfootwidth}{%
    the width of the letterhead page footer
    (\autoref{sec:scrlttr2-experts.firstFoot},
    \DescPageRef{scrlttr2-experts.plength.firstfootwidth})%
  }%
  \pentry{firstheadhpos}{%
    the horizontal distance of the letterhead from the left edge of the paper;
    values greater than the width of the paper or less than the negative value
    of the width of the paper activate special handling
    (\autoref{sec:scrlttr2-experts.firstHead},
    \DescPageRef{scrlttr2-experts.plength.firstheadhpos})%
  }%
  \pentry{firstheadvpos}{%
    the vertical distance of the letterhead from the top edge of the paper
    (\autoref{sec:scrlttr2-experts.firstHead},
    \DescPageRef{scrlttr2-experts.plength.firstheadvpos})%
  }%
  \pentry{firstheadwidth}{%
    the width of the letterhead (\autoref{sec:scrlttr2-experts.firstHead},
    \DescPageRef{scrlttr2-experts.plength.firstheadwidth})%
  }%
  \pentry{foldmarkhpos}{%
    the horizontal distance of the horizontal fold marks from the left edge of
    the paper (\autoref{sec:scrlttr2-experts.foldmarks},
    \DescPageRef{scrlttr2-experts.plength.foldmarkhpos})%
  }%
  \pentry{foldmarkvpos}{%
    the vertical distance of the vertical fold marks from the top edge of the
    paper (\autoref{sec:scrlttr2-experts.foldmarks},
    \DescPageRef{scrlttr2-experts.plength.foldmarkvpos})%
  }%
  \pentry{fromrulethickness}{%
    the thickness of an optional horizontal rule in the letterhead
    (\autoref{sec:scrlttr2-experts.firstHead},
    \DescPageRef{scrlttr2-experts.plength.fromrulethickness})%
  }%
  \pentry{fromrulewidth}{%
    the length of an optional horizontal rule in the letterhead
    (\autoref{sec:scrlttr2-experts.firstHead},
    \DescPageRef{scrlttr2-experts.plength.fromrulewidth})%
  }%
  \pentry{lfoldmarkhpos}{%
    the horizontal distance of the vertical fold mark from the left edge of
    the paper (\autoref{sec:scrlttr2-experts.foldmarks},
    \DescPageRef{scrlttr2-experts.plength.lfoldmarkhpos})%
  }%
  \pentry{lfoldmarklength}{%
    the length of the vertical fold mark
    (\autoref{sec:scrlttr2-experts.foldmarks},
    \DescPageRef{scrlttr2-experts.plength.lfoldmarklength})%
  }%
  \pentry{locheight}{%
    the height of the field containing the additional sender information if
    the value is not 0; if it is 0, \PLength{toaddrheight} is used instead
    (\autoref{sec:scrlttr2-experts.locationField},
    \DescPageRef{scrlttr2-experts.plength.locheight})%
  }%
  \pentry{lochpos}{%
    the horizontal distance of the field containing the additional sender
    information; if the value is positive, the distance is measured from the
    right paper edge; if negative, from the left paper edge; if 0, the
    negative value of \PLength{toaddrhpos} is used instead
    (\autoref{sec:scrlttr2-experts.locationField},
    \DescPageRef{scrlttr2-experts.plength.lochpos})%
  }%
  \pentry{locvpos}{%
    the vertical distance of the field containing the additional sender
    information from the top edge of the paper if the value is not 0; if it is
    0, \PLength{toaddrvpos} is used instead
    (\autoref{sec:scrlttr2-experts.locationField},
    \DescPageRef{scrlttr2-experts.plength.locvpos})%
  }%
  \pentry{locwidth}{%
    the width of the field containing the additional sender information; if it
    is 0, the width is calculated automatically based on the
    \DescRef{scrlttr2.option.locfield} option described in
    \autoref{sec:scrlttr2.firstpage}, \DescPageRef{scrlttr2.option.locfield} %
    (\autoref{sec:scrlttr2-experts.locationField},
    \DescPageRef{scrlttr2-experts.plength.locwidth})%
  }%
  \pentry{mfoldmarklength}{%
    the length of the middle horizontal fold mark
    (\autoref{sec:scrlttr2-experts.foldmarks},
    \DescPageRef{scrlttr2-experts.plength.mfoldmarklength})%
  }%
  \pentry{mfoldmarkvpos}{%
    the vertical distance of the middle horizontal fold mark from the top edge
    of the paper (\autoref{sec:scrlttr2-experts.foldmarks},
    \DescPageRef{scrlttr2-experts.plength.mfoldmarkvpos})%
  }%
  \pentry{pfoldmarklength}{%
    the length of the hole-punch mark
    (\autoref{sec:scrlttr2-experts.foldmarks},
    \DescPageRef{scrlttr2-experts.plength.pfoldmarklength})%
  }%
  \pentry{PPdatamatrixvskip}{%
    the vertical distance between the postpaid header and the data array with
    \OptionValueRef{scrlttr2}{addrfield}{PP}
    (\autoref{sec:scrlttr2-experts.addressee},
    \DescPageRef{scrlttr2-experts.plength.PPdatamatrixvskip})%
  }%
  \pentry{PPheadheight}{%
    the height of the postpaid header
    (\autoref{sec:scrlttr2-experts.addressee},
    \DescPageRef{scrlttr2-experts.plength.PPheadheight})%
  }%
  \pentry{PPheadwidth}{%
    the width of the left postpaid field with
    \OptionValueRef{scrlttr2}{addrfield}{PP}
    (\autoref{sec:scrlttr2-experts.addressee},
    \DescPageRef{scrlttr2-experts.plength.PPheadwidth})%
  }%
  \pentry{refaftervskip}{%
    vertical skip below reference-field line %
    (\autoref{sec:scrlttr2-experts.refLine},
    \DescPageRef{scrlttr2-experts.plength.refaftervskip})%
  }%
  \pentry{refhpos}{%
    the horizontal distance of reference-field line from the left
    edge of the paper; if the value is 0, the reference-field line is centred
    horizontally on the letterhead page
    (\autoref{sec:scrlttr2-experts.refLine},
    \DescPageRef{scrlttr2-experts.plength.refhpos})%
  }%
  \pentry{refvpos}{%
    the vertical distance of reference-field line from the top
    edge of the paper (\autoref{sec:scrlttr2-experts.refLine},
    \DescPageRef{scrlttr2-experts.plength.refvpos})%
  }%
  \pentry{refwidth}{%
    the width of the reference-field line
    (\autoref{sec:scrlttr2-experts.refLine},
    \DescPageRef{scrlttr2-experts.plength.refwidth})%
  }%
  \pentry{sigbeforevskip}{%
    the vertical skip between the closing and the signature
    (\autoref{sec:scrlttr2-experts.closing},
    \DescPageRef{scrlttr2-experts.plength.sigbeforevskip})%
  }%
  \pentry{sigindent}{%
    the indentation of the signature with respect to the text body
    (\autoref{sec:scrlttr2-experts.closing},
    \DescPageRef{scrlttr2-experts.plength.sigindent})%
  }%
  \pentry{specialmailindent}{%
    the left indentation of the delivery method within the address field
    (\autoref{sec:scrlttr2-experts.addressee},
    \DescPageRef{scrlttr2-experts.plength.specialmailindent})%
  }%
  \pentry{specialmailrightindent}{%
    the right indentation of the delivery method within the address field
    (\autoref{sec:scrlttr2-experts.addressee},
    \DescPageRef{scrlttr2-experts.plength.specialmailrightindent})%
  }%
  \pentry{subjectaftervskip}{%
    the vertical skip after the subject
    (\autoref{sec:scrlttr2-experts.subject},
    \DescPageRef{scrlttr2-experts.plength.subjectaftervskip})%
  }%
  \pentry{subjectbeforevskip}{%
    additional vertical skip before the subject
    (\autoref{sec:scrlttr2-experts.subject},
    \DescPageRef{scrlttr2-experts.plength.subjectbeforevskip})%
  }%
  \pentry{subjectvpos}{%
    the vertical distance of the subject from the top edge of the paper; if it
    is 0, the position is calculated based on the
    \DescRef{scrlttr2.option.subject} option
    (\autoref{sec:scrlttr2-experts.subject},
    \DescPageRef{scrlttr2-experts.plength.subjectaftervskip})%
  }%
  \pentry{tfoldmarklength}{%
    the length of the topmost horizontal fold mark
    (\autoref{sec:scrlttr2-experts.foldmarks},
    \DescPageRef{scrlttr2-experts.plength.tfoldmarklength})%
  }%
  \pentry{tfoldmarkvpos}{%
    the vertical distance of the topmost horizontal folding mark from the top
    edge of the paper (\autoref{sec:scrlttr2-experts.foldmarks},
    \DescPageRef{scrlttr2-experts.plength.tfoldmarkvpos})%
  }%
  \pentry{toaddrheight}{%
    the height of the address field (\autoref{sec:scrlttr2-experts.addressee},
    \DescPageRef{scrlttr2-experts.plength.toaddrheight})%
  }%
  \pentry{toaddrhpos}{%
    the horizontal distance of the address field from left edge of the paper,
    if the value is positive; if it is negative, the negative horizontal
    distance of the address field from the right edge of the paper
    (\autoref{sec:scrlttr2-experts.addressee},
    \DescPageRef{scrlttr2-experts.plength.toaddrhpos})%
  }%
  \pentry{toaddrindent}{%
    the left and right indentation of the address within the address field
    (\autoref{sec:scrlttr2-experts.addressee},
    \DescPageRef{scrlttr2-experts.plength.toaddrindent})%
  }%
  \pentry{toaddrvpos}{%
    the vertical distance of the address field from the the top edge of the
    paper (\autoref{sec:scrlttr2-experts.addressee},
    \DescPageRef{scrlttr2-experts.plength.toaddrvpos})%
  }%
  \pentry{toaddrwidth}{%
    the width of the address field %
    (\autoref{sec:scrlttr2-experts.addressee},
    \DescPageRef{scrlttr2-experts.plength.toaddrwidth})%
  }%
\end{desclist}

\begin{figure}
  \centering
  \includegraphics{plenDIN}
  \caption{Schematic of the pseudo-lengths for a letter}
  \label{fig:scrlttr2-experts.pseudoLength}
\end{figure}


\begin{Declaration}
  \Macro{newplength}\Parameter{name}
\end{Declaration}
This\ChangedAt{v3.26}{\Class{scrlttr2}\and \Package{scrletter}} command
defines a new pseudo-length. The new pseudo-length is uniquely identified by
its \PName{name}. Each name can therefore be assigned only once. If you
attempt to redefine an existing pseudo-length, the commands exits with an
error message.

\BeginIndex{Cmd}{@newplength}%
Since the ordinary user does not normally need to define pseudo-lengths, this
command was not a user instruction until \KOMAScript~3.26. Before then,
\Macro{@newplength} existed with the same functionality. This instruction still
exists for package authors.%
\EndIndexGroup


\begin{Declaration}
  \Macro{Ifplength}\Parameter{pseudo-length}%
                   \Parameter{then-code}\Parameter{else-code}
\end{Declaration}
This\ChangedAt{v3.27}{\Class{scrlttr2}\and \Class{scrletter}} command can be
used to determine whether a \PName{pseudo-length} has been defined. The
\PName{then-code} is executed if the \PName{pseudo-length} is defined and not
\Macro{relax}. Otherwise the \PName{else-code} is executed.

% Note: In the English manual this information is not \iffree{}{...}!
\BeginIndex{Cmd}{if@plength}%
For reasons of consistency only, the internal command \Macro{if@plength},
with the identical meaning, exists for the use of package authors.%
\EndIndexGroup


\begin{Declaration}
  \Macro{setplength}%
    \OParameter{factor}\Parameter{pseudo-length}\Parameter{value}%
  \Macro{addtoplength}%
    \OParameter{factor}\Parameter{pseudo-length}\Parameter{value}
\end{Declaration}
Using \Macro{setplength}, you can assign the multiple of a
\PName{value} to a \PName{pseudo-length}. The \PName{factor} is given as an
optional argument (see also \DescRef{scrlttr2.cmd.setlengthtoplength},
\autoref{sec:scrlttr2.pseudoLength},
\DescPageRef{scrlttr2.cmd.setlengthtoplength}).

With \Macro{addtoplength} you can add the multiple of a \PName{value} to a
\PName{pseudo-length}. Again, you can pass a \PName{factor} as an optional
argument.

To assign or to add the multiple of one \PName{pseudo-length} to another
pseudo-length, use the \Macro{useplength} command (see
\autoref{sec:scrlttr2.pseudoLength}, \DescPageRef{scrlttr2.cmd.useplength})
within the \PName{value}. To subtract the value of one \PName{pseudo-length}
from another \PName{pseudo-length}, you use should use at the same time a
minus sign or \PValue{-1} as the \PName{factor}.

\BeginIndex{Cmd}{@setplength}%
\BeginIndex{Cmd}{@addtoplength}%
Since the ordinary user does not normally need to define pseudo-lengths, these
commands were not user instructions until \KOMAScript~3.26. Before then,
\Macro{@setplength} and \Macro{@addtoplength} existed with the
same functionality. These commands still exist for the use of package authors.%
\EndIndexGroup

\begin{Declaration}
  \Macro{setplengthtowidth}
    \OParameter{factor}\Parameter{pseudo-length}\Parameter{content}%
  \Macro{setplengthtoheight}
    \OParameter{factor}\Parameter{pseudo-length}\Parameter{content}%
  \Macro{setplengthtodepth}
    \OParameter{factor}\Parameter{pseudo-length}\Parameter{content}%
  \Macro{setplengthtototalheight}
    \OParameter{factor}\Parameter{pseudo-length}\Parameter{content}%
\end{Declaration}
The\ChangedAt{v3.26}{\Class{scrlttr2}\and \Package{scrletter}} first three
commands essentially correspond with \Macro{settowidth},
\Macro{settoheight}, and \Macro{settodepth} from the \LaTeX{} kernel, but set
\PName{pseudo-length}s instead of lengths. Like 
\DescRef{\LabelBase.cmd.setplength}, these commands extend their \LaTeX{}
kernel equivalents with an optional \PName{factor}. They set a
\PName{pseudo-length} to the natural width, height or depth of the given
\PName{content}, multiplied by the optional \PName{factor}. The additional
command \Macro{setplengthtototalheight} sets the \PName{pseudo-length} to the
sum of the height and depth of \PName{content} multiplied by the optional
\PName{factor}.%
\EndIndexGroup


\subsection{Fold Marks}
\seclabel{foldmarks}
\BeginIndexGroup
\BeginIndex{}{fold marks}%
\index{marks>folding|see{fold marks}}

Fold marks, or folding marks, are short horizontal lines at the left edge, and
short vertical lines at the upper edge of the paper. \KOMAScript{} currently
supports three configurable horizontal and one configurable vertical fold
marks. In addition, there is support for a hole-punch mark, or centre mark,
which cannot be shifted vertically.

\begin{Declaration}
  \PLength{tfoldmarkvpos}%
  \PLength{mfoldmarkvpos}%
  \PLength{bfoldmarkvpos}
\end{Declaration}
\KOMAScript{} recognises a total of three fold marks whose vertical position
can be configured. The distance of the top fold mark from the upper edge of
the paper is determined by the \PLength{tfoldmarkvpos} pseudo-length; the
distance of the middle fold mark, by the
\PLength{mfoldmarkvpos}\ChangedAt{v2.97e}{\Class{scrlttr2}} pseudo-length; the
distance of the bottommost fold mark, by \PLength{bfoldmarkvpos}
pseudo-length. With the addition of the hole-punch\Index{hole-punch mark} or
centre\Index{centre mark|see{hole-punch mark}} mark, there is yet a fourth
horizontal mark. This one is however always placed at the vertical centre of
the paper.
\iftrue% Umbruchkorrekturtext
There is no pseudo-length for this last mark because its vertical position is
not configurable.
\fi

The\textnote{Attention!} top and bottom fold marks do not serve to divide the
paper exactly into equal thirds. Instead, the paper should be folded with
their help such that the address field can be seen in a window envelope. The
settings are therefore different depending on the \File{lco} file chosen.
Several such files are available offering predefined formats. One format
particularly worth noting is \Option{DINmtext}. This format assumes an
envelope format of C6/5 (also known as ``C6 long''). Letters written with this
option are typically not suited for C5 or C4 envelopes.

The middle fold mark is not normally required for Western letters. In Japan,
however, a larger number of envelope formats exists, requiring one more fold
mark (see the Japanese \File{lco} files). Note that the terms ``top'',
``middle'', and ``bottom'' fold marks only represent a naming convention. In
fact, it is not required that \PLength{tfoldmarkvpos} must be smaller than
\PLength{mfoldmarkvpos}, which in turn must be smaller than
\PLength{bfoldmarkvpos}. If, though, one of the pseudo-lengths is zero, then
the corresponding fold mark will not be set even if the
\DescRef{scrlttr2.option.foldmarks}\IndexOption{foldmarks~=\PName{setting}}%
\important{\DescRef{scrlttr2.option.foldmarks}} option (see
\autoref{sec:scrlttr2.firstpage}, \DescPageRef{scrlttr2.option.foldmarks}) is
explicitly activated.
%
\EndIndexGroup


\begin{Declaration}
  \PLength{tfoldmarklength}%
  \PLength{mfoldmarklength}%
  \PLength{bfoldmarklength}%
  \PLength{pfoldmarklength}
\end{Declaration}
These\ChangedAt{v2.97e}{\Class{scrlttr2}} four pseudo-lengths determine the
lengths of the four horizontal fold marks. One\textnote{Attention!} feature is
particularly worth noting. If the length is given as zero, then the three
vertically configurable pseudo-lengths \PLength{tfoldmarklength},
\PLength{mfoldmarklength} and \PLength{bfoldmarklength} are set to 2\Unit{mm}.
The length of the hole-punch mark, \PLength{pfoldmarklength}, however, is set
to 4\Unit{mm}.%
\EndIndexGroup


\begin{Declaration}
  \PLength{foldmarkhpos}
\end{Declaration}
This pseudo-length gives the distance of all horizontal fold marks from the
left edge of the paper. Normally, this is 3.5\Unit{mm}. You\textnote{Hint!}
can change this value in your own \File{lco} file if you are using a printer
that has a wider unprintable left margin. Whether the fold marks are typeset
at all depends on the option \DescRef{scrlttr2.option.foldmarks}%
\important{\DescRef{scrlttr2.option.foldmarks}}%
\IndexOption{foldmarks~=\PName{setting}} (see
\autoref{sec:scrlttr2.firstpage}, \DescPageRef{scrlttr2.option.foldmarks}).
%
\EndIndexGroup


\begin{Declaration}
  \PLength{lfoldmarkhpos}
\end{Declaration}
In\ChangedAt{v2.97e}{\Class{scrlttr2}} addition to the horizontal fold marks,
there is also a vertical fold mark. Its distance from the left margin is set
via the \PLength{lfoldmarkhpos} pseudo-length. This fold mark is used, for
example, in Japanese Chou- or You-format envelopes if you want to use them
with A4 paper. It can also be useful for envelopes in C6 format.%
\EndIndexGroup


\begin{Declaration}
  \PLength{lfoldmarklength}
\end{Declaration}
The\ChangedAt{v2.97e}{\Class{scrlttr2}} \PLength{lfoldmarklength}
pseudo-length determines the length of the vertical fold mark. Once again, a
feature worth noting is that if the length is given as zero, a length of
4\Unit{mm} is actually used.%
\EndIndexGroup


\begin{Declaration}
  \PLength{foldmarkvpos}
\end{Declaration}
This\ChangedAt{v2.97e}{\Class{scrlttr2}} pseudo-length determines the distance of
all vertical fold marks from the upper edge of the paper. Normally this is
3.5\Unit{mm}, but\textnote{Hint!} you can change the value in your own
\File{lco} file in case your printer has a wider unprintable
top margin. Whether or not the foldmarks are actually typeset depends on the 
\DescRef{scrlttr2.option.foldmarks}%
\important{\DescRef{scrlttr2.option.foldmarks}}%
\IndexOption{foldmarks~=\PName{setting}} option (see
\autoref{sec:scrlttr2.firstpage}, \DescPageRef{scrlttr2.option.foldmarks}).
\iffree{At present there is only one vertical fold mark, called the left
  vertical fold mark.}{}%
\EndIndexGroup


\begin{Declaration}
  \PLength{foldmarkthickness}
\end{Declaration}
This\ChangedAt{v2.97c}{\Class{scrlttr2}} pseudo-length determines the
thickness of all fold marks. The default is 0.2\Unit{pt}, in other words a
very thin hairline. In\textnote{Hint!} particular, if the colour of the fold
marks is changed, this may not be enough.%
\EndIndexGroup
%
\EndIndexGroup


\subsection{Letterhead}
\seclabel{firstHead}
\BeginIndexGroup
\BeginIndex{}{letterhead}%

The term letterhead refers here to all of the information concerning the
sender that appears above the recipient's address. Normally you would expect
that this information would be set through the page-style settings. In fact,
this was the case with the old letter class, \Class{scrlettr}.
But\textnote{Attention!} \Class{scrlttr2} and \Package{scrletter} output the
letterhead independently of the page style by means of the
\DescRef{scrlttr2.cmd.opening}\IndexCmd{opening} command.
% Fuellmaterial
\iftrue%
  The letterhead is positioned absolutely, so that it is independent of the
  type area. In fact, the first page of a letter, the page that holds the
  letterhead, is set using the page style
  \DescRef{scrlttr2.pagestyle.empty}\IndexPagestyle{empty}.%
\fi
% Ende des Fuellmaterials


\begin{Declaration}
  \PLength{firstheadvpos}
\end{Declaration}
The \PLength{firstheadvpos} pseudo-length gives the distance between the top
edge of the paper and the start of the letterhead. This value is set
differently in the various predefined
\File{lco} files\textnote{\File{lco} file}\Index{lco file=\File{lco} file}. A
typical value is 8\Unit{mm}.%
\EndIndexGroup


\begin{Declaration}
  \PLength{firstheadhpos}
\end{Declaration}
A positive value of the
\PLength{firstheadhpos}\ChangedAt{v3.05}{\Class{scrlttr2}} pseudo-length gives
the distance between the left edge of the paper and the start of the
letterhead. If\textnote{Attention!} the value is actually greater than or
equal to the paper width,
\Length{paperwidth}\important{\Length{paperwidth}}\IndexLength{paperwidth},
the letterhead will be centred horizontally on the letterhead paper. A
negative value gives the distance between the right edge of the paper and the
right edge of the letterhead. If the value actually less than or equal to the
negative value of the width of the paper, the letterhead is placed flush with
the left edge of the type area.

The default\textnote{Attention!} value is typically
\Length{maxdimen}\IndexLength{maxdimen}, which is the maximum allowed value of
a length. This results in horizontal centring.%
\EndIndexGroup


\begin{Declaration}
  \PLength{firstheadwidth}
\end{Declaration}
The \PLength{firstheadwidth} pseudo-length gives the width of the letterhead.
This value is set differently in the various predefined \File{lco}
files\textnote{\File{lco} file}\Index{lco file=\File{lco} file}. While this
value usually depends on the paper width and the distance between the left
edge of the paper and the recipient's address field, it was the width of the
type area in \Option{KOMAold} and has a fixed value of 170\Unit{mm} in
\Option{NF}.%
\EndIndexGroup


\begin{Declaration}
  \PLength{fromrulethickness}%
  \PLength{fromrulewidth}
\end{Declaration}
As mentioned in the explanation of the
\DescRef{scrlttr2.option.fromrule}\IndexOption{fromrule} option in
\autoref{sec:scrlttr2.firstpage}, \DescPageRef{scrlttr2.option.fromrule}, you
can put a horizontal rule within or below the sender's address in the
predefined letterheads. If\textnote{Attention!} the \PLength{fromrulewidth}
pseudo-length has a value of 0\Unit{pt}, which is the default in the
predefined \File{lco} files, the length of this rule is calculated
automatically taking into account, for example, letterhead width or an
optional logo. You can adjust rule length manually in your own \File{lco}
files by setting this pseudo-length to positive values using
\Macro{setplength} (see \DescPageRef{scrlttr2-experts.cmd.setplength}). The
default thickness of the line\ChangedAt{v2.97c}{\Class{scrlttr2}},
\PLength{fromrulethickness}, is 0.4\Unit{pt}.%
\EndIndexGroup
%
\EndIndexGroup


\subsection{Addressee}
\seclabel{addressee}%
\BeginIndexGroup
\BeginIndex{}{addressee}
\index{recipient|seealso{addressee}}

The term \emph{addressee} normally refers only to the recipient's name and
address, which are output in an address field. Additional information,
however, can be placed within this address field, including the delivery
method, for example registered mail or special delivery. For window envelopes,
the return address also counts as part of the address field, as it will be
displayed in the address window. The address field directly follows the
letterhead.

\begin{Declaration}
  \PLength{toaddrvpos}%
  \PLength{toaddrhpos}
\end{Declaration}
These pseudo-lengths define the vertical and horizontal distance of the
address field from the top-left corner of the paper. Values are set
differently in the various predefined \File{lco} files\textnote{\File{lco}
file}\Index{lco file=\File{lco} file}, according to standard envelope window
measures. For \PLength{toaddrhpos}, one property worth noting is that with
negative values, the offset is the distance from the right edge of the address
field to the right edge of the paper. You will find this, for instance, in
\Option{SN} or \Option{NF}. The smallest value of \PLength{toaddrvpos} is
found with \Option{DINmtext}. With this setting, the letterhead can easily
protrude into the address window. Whether the address field is output or not
depends on the \Option{addrfield} option (see
\autoref{sec:scrlttr2.firstpage}, \DescPageRef{scrlttr2.option.addrfield}).%
\EndIndexGroup


\begin{Declaration}
  \PLength{toaddrheight}
\end{Declaration}
This pseudo-length defines the height of the address field, including the
delivery method. Whether the name and address of the recipient are vertically
centred in the address field, taking into account the presence or absence of
the delivery method, depends on the \DescRef{scrlttr2.option.addrfield}
option.%
\EndIndexGroup
 

\begin{Declaration}
  \PLength{toaddrwidth}
\end{Declaration}
This pseudo-length defines the width of the address field. The various
predefined \File{lco} files\textnote{\File{lco} files}\Index{lco
file=\File{lco} files} use different settings according to the different
standards for window envelopes. Typical values are between 70\Unit{mm} and
100\Unit{mm}.
\begin{Example}
  Suppose your printer has very wide, non-printable left and right margins of 15\Unit{mm}.
  This means that the letterhead, the additional sender information, and the address field cannot
  be completely printed if you use the \Option{SN} option. You therefore
  create a new \File{lco} file with the following content:
\begin{lstcode}
  \ProvidesFile{SNmmarg.lco}
               [2002/06/04 v0.1 my lco]
  \LoadLetterOption{SN}
  \addtoplength{toaddrwidth}{%
    -\useplength{toaddrhpos}}
  \setplength{toaddrhpos}{-15mm}
  \addtoplength{toaddrwidth}{%
    \useplength{toaddrhpos}}
  \endinput
\end{lstcode}
  Then, until you can obtain a printer with smaller page margins, you
  simply use the option \Option{SNmmarg} instead of \Option{SN}.%
\end{Example}%
%
\EndIndexGroup


\begin{Declaration}
  \PLength{toaddrindent}
\end{Declaration}
Sometimes you do not want the address field to extend the full width of the
address window but to be indented a bit. You can set the amount of this
indentation with the \PLength{toaddrindent} pseudo-length. Typically, the
default value is 0\Unit{pt}.

For\textnote{Attention!} the\ChangedAt{v3.03}{\Class{scrlttr2}}
\OptionValueRef{scrlttr2}{addrfield}{PP}\important{%
  \OptionValueRef{scrlttr2}{addrfield}{PP}\\
  \OptionValueRef{scrlttr2}{addrfield}{image}\\
  \OptionValueRef{scrlttr2}{addrfield}{backgroundimage}
}\IndexOption{addrfield~=\textKValue{PP}},
\OptionValueRef{scrlttr2}{addrfield}{image}%
\IndexOption{addrfield~=\textKValue{image}}, and
\OptionValueRef{scrlttr2}{addrfield}{backgroundimage}%
\IndexOption{addrfield~=\textKValue{backgroundimage}} settings (see
\autoref{sec:scrlttr2.firstpage}, \DescPageRef{scrlttr2.option.addrfield}) a
value of 0\Unit{pt} will be replaced by a value of 8\Unit{mm}. If you really
do not want any indentation, you can use a value of 1\Unit{sp} to set a
negligibly small indentation. Furthermore, \PLength{toaddrindent} is also used
for the distance to the right edge of the address window with the these
\Option{addrfield} settings.%
\EndIndexGroup


\begin{Declaration}
  \PLength{backaddrheight}
\end{Declaration}
For window envelopes, the sender is often printed in a small font on one line
above the addressee. This sender information is called the return
address\textnote{return address}\Index{return address}, because it is visible
in the address window and will be used by the post office to return an
undeliverable letter to the sender. This return address, therefore, requires
only the information necessary for that purpose.

The height reserved for the return address within the address window is given
by the \PLength{backaddrheight} pseudo-length. This value is typically
5\Unit{mm} in the predefined \File{lco} files\textnote{\File{lco}
file}\Index{}{lco file=\File{lco} file}. Whether to print the return address
at all depends on the \Option{addrfield} (see
\autoref{sec:scrlttr2.firstpage}, \DescPageRef{scrlttr2.option.addrfield}) and
\DescRef{scrlttr2.option.backaddress} options (see
\autoref{sec:scrlttr2.firstpage}, \DescPageRef{scrlttr2.option.backaddress}).%
\EndIndexGroup


\begin{Declaration}
  \PLength{specialmailindent}%
  \PLength{specialmailrightindent}
\end{Declaration}
You can print an optional delivery method between the return address and the
recipient's address. This field is printed only if the
\DescRef{scrlttr2.variable.specialmail} variable has non-empty contents. Its
alignment is determined by the \PLength{specialmailindent} and
\PLength{specialmailrightindent} pseudo-lengths, which specify the left and
right indentation, respectively. In the predefined \File{lco}
files\textnote{\File{lco} file}\Index{lco file=\File{lco} file},
\PLength{specialmailindent} is set to rubber length \Macro{fill}, while
\PLength{specialmailrightindent} is set to 1\Unit{em}. Thus the delivery
method is set 1\Unit{em} from the address field's right margin.%
\EndIndexGroup


\begin{Declaration}
  \PLength{PPheadheight}%
  \PLength{PPheadwidth}
\end{Declaration}
The \PLength{PPheadheight}\ChangedAt{v3.03}{\Class{scrlttr2}} pseudo-length
specifies the height reserved for the postpaid header at the start of the
address field for the two options
\OptionValueRef{scrlttr2}{addrfield}{PP}\important{%
  \OptionValueRef{scrlttr2}{addrfield}{PP}\\
  \OptionValueRef{scrlttr2}{addrfield}{backgroundimage}}%
\IndexOption{addrfield~=\textKValue{PP}} and
\OptionValueRef{scrlttr2}{addrfield}{backgroundimage}%
\IndexOption{addrfield~=\textKValue{backgroundimage}}. The
\PLength{PPheadwidth} pseudo-length is used only with
\OptionValueRef{scrlttr2}{addrfield}{PP} (see
\autoref{sec:scrlttr2.firstpage}, \DescPageRef{scrlttr2.option.addrfield}) and
gives the width of the left-hand field within the postpaid header, which
contains the postpaid logo, the postal code, and the location. The width of
the right-hand field containing the sender's code and the priority is the
remaining width.

\KOMAScript{}\textnote{Attention!} automatically changes the default value of
0\Unit{mm} for the \PLength{PPheadheight} pseudo-length to 20.74\Unit{pt}, and
\PLength{PPheadwidth}'s default from 0\Unit{mm} to 42\Unit{mm}.%
%
\EndIndexGroup


\begin{Declaration}
  \PLength{PPdatamatrixvskip}
\end{Declaration}
This\ChangedAt{v3.03}{\Class{scrlttr2}} pseudo-length specifies the vertical
distance between the postpaid header and the data array used with
\OptionValueRef{scrlttr2}{addrfield}{PP}%
\important{\OptionValueRef{scrlttr2}{addrfield}{PP}}%
\IndexOption{addrfield~=\PValue{PP}} (see \autoref{sec:scrlttr2.firstpage},
\DescPageRef{scrlttr2.option.addrfield}). \KOMAScript{}\textnote{Attention!}
automatically changes the default value of 0\Unit{mm} to 9\Unit{mm}. The data
matrix is flush right within the postpaid header.%
\EndIndexGroup
%
\EndIndexGroup


\subsection{Extra Sender Information}
\seclabel{locationField}
\BeginIndexGroup
\BeginIndex{}{extra sender information}
\index{sender>extra information|see{extra sender information}}

Often, especially with business letters, there is not enough space in the
letterhead and footer to accommodate all the information about the sender that
you want to include. For such additional information, you can use the space
next to the addressee. In this manual, this field is called the
\emph{extra sender information}. In earlier versions of this manual, it
was called the \emph{sender's extension} or the \emph{location field}.

\begin{Declaration}
  \PLength{locheight}%
  \PLength{lochpos}%
  \PLength{locvpos}%
  \PLength{locwidth}
\end{Declaration}
The \PLength{locwidth} and
\PLength{locheight}\ChangedAt{v2.97d}{\Class{scrlttr2}} pseudo-lengths set the
width and height of the extra-sender-information field. The \PLength{lochpos}
and \PLength{locvpos} pseudo-lengths determine the distances from the
top-right edge of the paper. These values are typically set to 0\Unit{pt} in
the predefined \File{lco} files. These\textnote{Attention!} zero-length values
have a special meaning. They result in the actual values being set within
\DescRef{scrlttr2.cmd.opening} based on the paper width, the address-window
width, the address window's distance from the top-left edge of the paper, and
the \DescRef{scrlttr2.option.locfield} option (see
\autoref{sec:scrlttr2.firstpage}, \DescPageRef{scrlttr2.option.locfield}). As
is the case for \PLength{toaddrhpos}, negative values of \PLength{lochpos}
also take on a special meaning. Instead of referring to the distance from the
right edge of the paper, \PLength{lochpos} then refers to the distance from
the left edge of the paper. The meaning is thus the opposite of that of
\PLength{toaddrhpos} (see \autoref{sec:scrlttr2-experts.addressee},
\DescPageRef{scrlttr2-experts.plength.toaddrhpos}).%
\EndIndexGroup
%
\EndIndexGroup


\subsection{Reference Line}
\seclabel{refLine}%
\BeginIndexGroup
\BeginIndex{}{reference line}
\index{business line|see{reference line}}

The reference line can actually be longer than just one line. It is printed
only if at least one of variables for the reference line is not empty. Only
non-empty fields will be printed. To\textnote{Hint!} set a seemingly empty
field, you can provide content for the variable that appears empty, such as
\Macro{mbox}\Parameter{}. If the reference line is omitted, the description
and contents of the \DescRef{scrlttr2.variable.date} variable are printed in
its place. You can find information about adding variables to or removing them
from the reference line in \autoref{sec:scrlttr2-experts.variables},
\DescPageRef{scrlttr2-experts.cmd.removereffields}.


\begin{Declaration}
  \PLength{refvpos}
\end{Declaration}
This pseudo-length specifies the distance from the upper edge of the paper to
the reference line. Its value is set differently in the various predefined
\File{lco} files\textnote{\File{lco} file}\Index{lco file=\File{lco} file}.
Typical values are between 80.5\Unit{mm} and 98.5\Unit{mm}.%
\EndIndexGroup


\begin{Declaration}
  \PLength{refwidth}%
  \PLength{refhpos}
\end{Declaration}
The \PLength{refwidth} pseudo-length specifies the width available for the
reference line. Its value is typically set to 0\Unit{pt} in the predefined
\File{lco} files\textnote{\File{lco} file}\Index{lco file=\File{lco} file}.
This\textnote{Attention!} value has a special meaning. In no way does it
indicate that there is no available width for the reference line. Instead, it
indicates that the width will be calculated within the
\DescRef{scrlttr2.cmd.opening}\IndexCmd{opening} command. This calculated
width then depends on the value of the \DescRef{scrlttr2.option.refline}%
\important{\DescRef{scrlttr2.option.refline}}%
\IndexOption{refline~=\PName{setting}} options (see
\autoref{sec:scrlttr2.firstpage}, \DescPageRef{scrlttr2.option.refline}). At
the same time, \PLength{refhpos} will also be set according to this option.
With \OptionValueRef{scrlttr2}{refline}{wide}%
\IndexOption{refline~=\textKValue{wide}}, the reference fields line is
centred, while with \OptionValueRef{scrlttr2}{refline}{narrow}%
\IndexOption{refline~=\textKValue{narrow}} it is aligned flush left with the
type area.

If \PLength{refwidth} is not zero, the width of the reference line is not
determined by the  \DescRef{scrlttr2.option.refline} option, and so
\PLength{refhpos} specifies the distance of the reference line from the left
edge of the paper. If\textnote{Attention!} this distance is zero, the the
reference line is placed so that the ratio between its distances from the left
and right edges of the paper corresponds to the ratio of distance of the type
area from the left and right edges of the paper. Thus, for a type area
horizontally centred on the paper, the reference line will also be centred.

As a rule, these special cases are likely of little interest to the normal
user. The\textnote{Attention!} simplest rule is as follows: either
\PLength{refhpos} remains zero, and so the width and alignment of the
reference line are determined with the \DescRef{scrlttr2.option.refline}
option, or the user sets both \PLength{refwidth} and \PLength{refhpos}.%
\EndIndexGroup


\begin{Declaration}
  \PLength{refaftervskip}
\end{Declaration}
This pseudo-length specifies the vertical skip to be inserted beneath the
reference line. The value is set in the predefined \File{lco}
files\textnote{\File{lco} file}\Index{lco file=\File{lco} file}. It directly
affects the height of the text area on the first page. A typical value is
between one and two lines.%
\EndIndexGroup
%
\EndIndexGroup


\subsection{Subject}
\seclabel{subject}%
\BeginIndexGroup
\BeginIndex{}{subject}

Different countries have different conventions for placing the subject line of
a letter. Some place it before the opening phrase; others place it after. Some
professional groups even want it before the reference line.

\begin{Declaration}
  \PLength{subjectvpos}
\end{Declaration}
\ChangedAt{v3.01}{\Class{scrlttr2}}%
If\textnote{Attention!} the value of this pseudo-length is 0\Unit{pt}, the
\DescRef{scrlttr2.option.subject}\important{\DescRef{scrlttr2.option.subject}}%
\IndexOption{subject~=\PName{Einstellung}} option (see
\autoref{sec:scrlttr2.firstpage}, \DescPageRef{scrlttr2.option.subject})
determines the position of the subject. Any other value defines the distance
between the top edge of the paper and the subject. In this
case\textnote{Hint!}, you should ensure that there is enough space available
that overlapping with other elements is unlikely.
\begin{Example}
  A few professionals prefer to have the subject above the reference line. For
  this, you can specify the position as follows, which also changes the
  position of the reference line itself:
\begin{lstcode}
  \ProvidesFile{lawsubj.lco}
               [2008/11/03 lawyers lco file]
  \setplength{subjectvpos}{\useplength{refvpos}}
  \addtoplength{refvpos}{3\baselineskip}
  \endinput
\end{lstcode}
  If you want to leave at least one empty line between the subject and the
  reference, you have space for a maximum of two lines.
\end{Example}
\EndIndexGroup


\begin{Declaration}
  \PLength{subjectbeforevskip}%
  \PLength{subjectaftervskip}
\end{Declaration}
\ChangedAt{v3.01}{\Class{scrlttr2}}%
If the subject is placed not absolutely but before or after the salutation,
you can insert additional vertical space before and after the subject. The
space before the subject may interfere with other distances, such as the
automatic distance of one line after the title. Therefore the default is to
use no additional space here. The default of the class and the package for the
space after the subject is two lines.%
\EndIndexGroup
%
\EndIndexGroup


\subsection{Closing}
\seclabel{closing}
\BeginIndexGroup
\BeginIndex{}{closing}

The closing of a letter consists of three parts: In addition to the closing
phrase, there is a hand-written signature and a printed text such as a name,
which acts as a kind of explanation of the hand-written signature.

\begin{Declaration}
  \PLength{sigindent}%
  \PLength{sigbeforevskip}
\end{Declaration}
The closing phrase\Index{closing>phrase}\Index{signature} and signature
explanation are typeset in a box whose width is determined by the length of
the longest line of the closing phrase or explanation.

The box will be indented by the distance specified in the \PLength{sigindent}
pseudo-length. In the predefined \File{lco} files\textnote{\File{lco}
file}\Index{lco file=\File{lco} file}, this length is set to 0\Unit{mm}.

Between the closing phrase and the signature explanation, a vertical skip is
inserted whose height is defined in the \PLength{sigbeforevskip}
pseudo-length. In the predefined \File{lco} files\textnote{\File{lco}
file}\Index{lco file=\File{lco} file} this value is set to two lines. In this
space you can then write your signature.%
\iffalse% Umbruchkorrekturtext
\ If you decide to include a facsimile of your signature in the
\DescRef{scrlttr2.variable.signature}\IndexVariable{signature}%
\important{\DescRef{scrlttr2.variable.signature}} with the
\Package{graphicx}\IndexPackage{graphicx} package, it would be useful
to reduce the value of \PLength{sigbeforevskip} and thus the gap between
the closing phrase and the signature.%
\fi%
\EndIndexGroup
%
\EndIndexGroup


\subsection{Letterhead Page Footer}
\seclabel{firstFoot}%
\BeginIndexGroup
\BeginIndex{}{letterhead page>footer}%

The first page of a letter, the letterhead page, contains not just its own
header, the letterhead, but also its own footer\Index{footer>letterhead
page}\Index{footer}. Just like the letterhead, it will be set not by the page
style but directly within \DescRef{scrlttr2.cmd.opening}\IndexCmd{opening}%
\important{\DescRef{scrlttr2.cmd.opening}}.

\begin{Declaration}
  \PLength{firstfootvpos}
\end{Declaration}
This pseudo-length gives the distance from the top of the paper to the footer
of the letterhead page. It also ensures that the text area does not protrude
into the footer. To do so, the height of the text area on the first page will
be decreased, if necessary, using
\Macro{enlargethispage}\IndexCmd{enlargethispage}%
\important{\Macro{enlargethispage}}. The
\DescRef{scrlttr2.option.enlargefirstpage}%
\important{\DescRef{scrlttr2.option.enlargefirstpage}} option (see
\autoref{sec:scrlttr2.firstpage},
\DescPageRef{scrlttr2.option.enlargefirstpage}) can also ensure that the
height of the text area is increased, if necessary. Thus, the distance between
text area and the letterhead page footer can be reduced to the value of the
\Length{footskip}\IndexLength{footskip}\important{\Length{footskip}} length.

With\textnote{Attention!} the compatibility option
set\ChangedAt{v2.9t}{\Class{scrlttr2}} to versions up to
2.9t\IndexOption{version~=\PValue{2.9t}} (see
\DescRef{scrlttr2.option.version} in
\autoref{sec:scrlttr2.compatibilityOptions},
\DescPageRef{scrlttr2.option.version}) the footer is set independently of the
type area in all predefined \File{lco} files\textnote{\File{lco}
file}\Index{lco file=\File{lco} file} (see \autoref{sec:scrlttr2.lcoFile})
except for \Option{KOMAold} and \Option{NF}. Thus the
\DescRef{scrlttr2.option.enlargefirstpage}%
\important{\DescRef{scrlttr2.option.enlargefirstpage}} option has no effect.
From version 2.9u on, the footer is placed at the bottom edge of the paper.
Thus, the height of the letterhead page's type area may also depend on the
\DescRef{scrlttr2.option.enlargefirstpage} option.

If the letter footer is deactivated with the
\OptionValueRef{scrlttr2}{firstfoot}{false}%
\important{\OptionValueRef{scrlttr2}{firstfoot}{false}}%
\IndexOption{firstfoot~=\PValue{false}}\ChangedAt{v2.97e}{\Class{scrlttr2}}
option (see \autoref{sec:scrlttr2.firstpage},
\DescPageRef{scrlttr2.option.firstfoot}), the setting of
\PLength{firstfootvpos} is ignored, and instead
\Length{paperheight}\IndexLength{paperheight} is applied. There remains then a
minimum bottom margin of length \Length{footskip}\IndexLength{footskip}.%
\EndIndexGroup


\begin{Declaration}
  \PLength{firstfoothpos}
\end{Declaration}
\ChangedAt{v3.05}{\Class{scrlttr2}}%
A\textnote{Attention!} positive value of the \PLength{firstfoothpos}
pseudo-length specifies the distance from the left edge of the paper to the
letterhead page footer. If the value is greater than or equal to the paper
width, \Length{paperwidth}\IndexLength{paperwidth}, the footer is centred
horizontally on the letterhead page. But if the value is less than or equal to
the negative width of the paper, the footer is placed flush with the left edge
of the typing area.

The typical default for this value is \Length{maxdimen}\IndexLength{maxdimen},
which is the maximum possible value for a length. This results in horizontal
centring.%
\EndIndexGroup


\begin{Declaration}
  \PLength{firstfootwidth}
\end{Declaration}
This pseudo-length specifies the width of the footer of the first page of the
letter, that is the letterhead page. The value in the predefined \File{lco}
files\textnote{\File{lco} file}\Index{lco file=\File{lco} file} matches
\PLength{firstheadwidth}\important{\PLength{firstheadwidth}}%
\IndexPLength{firstheadwidth}.%
%
\EndIndexGroup
%
\EndIndexGroup
%
\EndIndexGroup


\section{Variables for Experienced Users}
\seclabel{variables}
\BeginIndexGroup
\BeginIndex{}{variables}

\KOMAScript{} provides commands not only to use predefined variables but also
to define new variables or to change their automatic use within the reference
line\Index{reference line}.

\begin{Declaration}
  \Macro{newkomavar}\OParameter{description}\Parameter{name}%
  \Macro{newkomavar*}\OParameter{description}\Parameter{name}%
  \Macro{removereffields}%
  \Macro{defaultreffields}%
  \Macro{addtoreffields}\Parameter{name}
\end{Declaration}
\Macro{newkomavar} defines a new variable. This variable is referenced as
\PName{name}. Optionally, you can define a \PName{description} for the
\PName{name} variable. Unlike the \PName{name}, the \PName{description} is not
used to reference a variable. Instead, the \PName{description} acts as a
supplement to the content of a variable that can be printed as a label along
with its content.

You can use the \Macro{addtoreffields} command to add the \PName{name}
variable to the reference line\Index{reference line} (see
\autoref{sec:scrlttr2.firstpage}, \DescPageRef{scrlttr2.option.refline}). The
\PName{description} and the content of the variable are added to the end of
the reference line. The starred version \Macro{newkomavar*} is similar to the
unstarred version but also calls the \Macro{addtoreffields} command. Thus, the
starred version automatically adds the variable to the reference line.
\begin{Example}
  Suppose you need an additional field for a telephone extension in the
  reference line. You can define this field with
\begin{lstcode}
  \newkomavar[Extension]{myphone}
  \addtoreffields{myphone}
\end{lstcode}
  or more concisely with
\begin{lstcode}
  \newkomavar*[Extension]{myphone}
\end{lstcode}
\end{Example}
When\textnote{Attention!} you define a variable for the reference line, you
should always give it a description.

You can use the \Macro{removereffields} command to remove all variables from
the reference field. This includes the predefined variables of the class. The
reference line is then empty. This can be useful, for example, if you wish to
change the order of the variables in the reference fields line.

The \Macro{defaultreffields} command resets the reference fields line to its
predefined format. In doing so, all custom-defined variables are removed from
the reference fields line.

You\textnote{Attention!} should not add the date to the reference line with
the \Macro{addtoreffields} command. Instead you should use the
\DescRef{scrlttr2.option.refline}%
\important{\OptionValueRef{scrlttr2}{refline}{dateleft}\\
\OptionValueRef{scrlttr2}{refline}{dateright}\\
\OptionValueRef{scrlttr2}{refline}{nodate}}%
\IndexOption{refline~=\textKValue{dateleft}}%
\IndexOption{refline~=\textKValue{dateright}}%
\IndexOption{refline~=\textKValue{nodate}} option to select whether the date
should appear on the left or right side of the reference line, or not at all.
These settings also affect the position of the date when no reference line is
used.%
%
\EndIndexGroup


\begin{Declaration}
  \Macro{usekomavar}\OParameter{command}\Parameter{name}%
  \Macro{usekomavar*}\OParameter{command}\Parameter{name}
\end{Declaration}
The \DescRef{scrlttr2.cmd.usekomavar} and \DescRef{scrlttr2.cmd.usekomavar*}
commands are, like all commands where a starred version exists or which can
take an optional argument, not fully expandable. Nevertheless, if you use them
within \DescRef{scrlttr2.cmd.markboth}\IndexCmd{markboth},
\DescRef{scrlttr2.cmd.markright}\IndexCmd{markright} or similar commands, you
need not insert \Macro{protect}\IndexCmd{protect} beforehand. Of course
this is also true for
\DescRef{scrlayer-scrpage.cmd.markleft}\IndexCmd{markleft} if you use the
\hyperref[cha:scrlayer-scrpage]{\Package{scrlayer-scrpage}}%
\IndexPackage{scrlayer-scrpage} package. These\textnote{Attention!} commands
cannot be used within commands that directly affect their argument, such as
\Macro{MakeUppercase}\important{\Macro{MakeUppercase}}%
\IndexCmd{MakeUppercase}. To avoid this problem you can use commands like
\Macro{MakeUppercase} as an optional argument to \Macro{usekomavar} or
\Macro{usekomavar*}. Then you will get the upper-case content of a variable
with
\begin{lstcode}[escapeinside=`']
  \usekomavar[\MakeUppercase]{`\PName{Name}'}
\end{lstcode}
%
\EndIndexGroup


\begin{Declaration}
  \Macro{ifkomavarempty}\Parameter{name}\Parameter{true}\Parameter{false}%
  \Macro{ifkomavarempty*}\Parameter{name}\Parameter{true}\Parameter{false}
\end{Declaration}
It is important to know that the content of the variable will be expanded as
far as this is possible with \Macro{edef}. If this results in spaces or
unexpandable macros like \Macro{relax}, the result will be not empty even
where the use of the variable would not result in any visible output.

Once\textnote{Attention!} again, this command cannot be used as the argument
of \Macro{MakeUppercase}\IndexCmd{MakeUppercase} or similar commands However,
it is robust enough to be used as the argument of
\DescRef{scrlttr2.cmd.markboth} or \DescRef{scrlttr2.cmd.footnote}, for
example.%
%
\EndIndexGroup


\begin{Declaration}
  \Macro{foreachkomavar}\Parameter{list of variables}\Parameter{command}
  \Macro{foreachnonemptykomavar}\Parameter{list of variables}\Parameter{command}
  \Macro{foreachemptykomavar}\Parameter{list of variables}\Parameter{command}
  \Macro{foreachkomavarifempty}\Parameter{list of variables}
                               \Parameter{then-code}\Parameter{else-code}
\end{Declaration}
The\ChangedAt{v3.27}{\Class{scrlttr2}\and \Package{scrletter}} 
\Macro{foreachkomavar} command executes the specified \PName{command} for each
variable in the comma-separated \PName{list of variables}. The name of each
variable is added as parameter to the \PName{command}.%

The \Macro{foreachnonemptykomavar} command does the same but only for those
variables that are not empty in sense of
\DescRef{\LabelBase.cmd.ifkomavarempty}. Empty variables in the \PName{list of
  variables} are ignored.

By contrast, the \Macro{foreachemptykomavar} command executes the
\PName{command} only for variables that are empty in sense of
\DescRef{\LabelBase.cmd.ifkomavarempty}. Accordingly, non-empty variables are
ignored.

The \Macro{foreachkomavarifempty} command is a kind of combination of the two
previously described commands. It executes the \PName{then-command} only for
those variables in the \PName{list of variables} that are empty, and the
\PName{else-command} for the non empty variables. As with \PName{command}, the
name of each variable is added as a parameter in both cases.%
\EndIndexGroup
%
\EndIndexGroup


\section{Additional Information about Page Styles}
\seclabel{pagestyleatscrletter}
\BeginIndexGroup
\BeginIndex{}{page>style}

\LoadNonFree{scrlttr2-experts}{0}%
\EndIndexGroup

\iffalse% Wurde bereits in Kapitel 4.21 behandelt
\section{Differences in How \Package{scrletter} Handles \File{lco} Files}
\seclabel{lcoatscrletter}
\BeginIndexGroup
\BeginIndex{File}{lco}
\BeginIndex{}{lco file=\File{lco} file}

As\ChangedAt{v3.15}{\Package{scrletter}} explained in
\autoref{sec:scrlttr2.lcoFile}, \Class{scrlttr2} can load \File{lco} files via
the optional argument of \Macro{documentclass}. The \Package{scrletter} package
does not support this.

\begin{Declaration}
  \Macro{LoadLetterOption}\Parameter{name}%
  \Macro{LoadLetterOptions}\Parameter{list of names}
\end{Declaration}
For \Class{scrlttr2}, load \File{lco} files with
\DescRef{scrlttr2.cmd.LoadLetterOption} or
\DescRef{scrlttr2.cmd.LoadLetterOptions} is only a recommendation. For
\Package{scrletter}, it is mandatory. Of course, you can only load the
\File{lco} files after you load \Package{scrletter}.
%
\EndIndexGroup
%
\EndIndexGroup
\fi


\section{\File{lco} Files for Experienced Users}
\seclabel{lcoFile}
\BeginIndexGroup
\BeginIndex{File}{lco}
\BeginIndex{}{lco file=\File{lco} file}

\BeginIndexGroup%
\BeginIndex{}{paper>format}%
Although you can use any paper size that the
\hyperref[cha:typearea]{\Package{typearea}}%
\IndexPackage{typearea} package can configure, the output of the letterhead
page may produce undesirable results with some formats. Unfortunately, there
are no general rules to calculate the position of the address fields and the
like for every available paper size. Instead, different parameter sets are
needed for different paper sizes.%

%\subsection{Verifying the Paper Size}
%\seclabel{papersize}

At present parameter sets and \File{lco} files exist only for A4-sized and
letter-sized paper. Theoretically, however, the \Class{scrlttr2} class can
support many more paper sizes. Therefore, it's necessary to verify that the
correct paper size is used. This is even more true if you use
\Package{scrletter}, since the paper size depends on the class you use.

\begin{Declaration}
  \Macro{LetterOptionNeedsPapersize}%
    \Parameter{option name}\Parameter{paper size}
\end{Declaration}
To provide at least a warning when another \PName{paper size} is used, you can
find a \Macro{LetterOptionNeedsPapersize} command in every \File{lco} file
distributed with {\KOMAScript}. The first argument is the name of the
\File{lco} file without the ``\File{.lco}'' suffix. The second argument is the
paper size for which the \File{lco} file is designed.

If several \File{lco} files are loaded in succession, a
\Macro{LetterOptionNeedsPapersize} command can be contained in each of them,
but the \DescRef{scrlttr2.cmd.opening} command will only check the last given
\PName{paper size}. As the following example shows, an experienced user can
thus easily write \File{lco} files with parameter sets for other paper sizes.
\iffalse% Umbruchoptimierung
If you do not plan to set up such \File{lco} files yourself, you can just
forget about this option and skip the example.%
\fi
\begin{Example}
  Suppose you use A5-sized paper in normal, that is upright or portrait,
  orientation for your letters. Let's assume that you want to put them into
  standard C6 window envelopes. In that case, the position of the address
  field would be the same as for a standard letter on A4-sized paper. The main
  difference is that A5 paper needs only one fold. So you want to disable the
  top and bottom fold marks. You can do this, for example, by placing the
  marks outside the paper area.
\begin{lstcode}
  \ProvidesFile{a5.lco}
               [2002/05/02 letter class option]
  \LetterOptionNeedsPapersize{a5}{a5}
  \setplength{tfoldmarkvpos}{\paperheight}
  \setplength{bfoldmarkvpos}{\paperheight}
\end{lstcode}
  Of course, it would be more elegant to deactivate the marks with the
  \DescRef{scrlttr2.option.foldmarks} option. In addition, you must adjust the
  position of the footer, that is, the \PLength{firstfootvpos} pseudo-length.
  I leave it to the reader to find an appropriate value. When using such an
  \File{lco} file, you must declare other \File{lco} file options like
  \File{SN} before you load ``\File{a5.lco}''.
\end{Example}
%
\EndIndexGroup%
\EndIndexGroup%
\vskip-\ht\strutbox% Wegen Beispiel am Ende der Erklaerung


%\subsection{Visualizing Positions}
%\seclabel{visualize}
%\BeginIndexGroup
\begin{Declaration}
  \File{visualize.lco}
\end{Declaration}
\BeginIndex{Option}{visualize}%
If you develop your own \File{lco} file, for example to modify the positions
of various fields on the letterhead page because your own desires or
requirements, it is helpful if you can make at least some elements directly
visible. The \File{lco} file
\File{visualize.lco}\ChangedAt{v3.04}{\Class{scrlttr2}} exists for this
purpose. You can load this file as you would any other \File{lco} file. But
this \emph{letter class options} file must be loaded in the document preamble,
and its effects cannot be deactivated. The \File{lco} file uses the
\Package{eso-pic}\IndexPackage{eso-pic}%
\important[i]{\Package{eso-pic}\\\Package{graphicx}} and
\Package{graphicx}\IndexPackage{graphicx} packages, which are not part of
\KOMAScript.


\begin{Declaration}
  \Macro{showfields}\Parameter{field list}
\end{Declaration}
This command makes the space occupied by the fields on the letterhead page
visible. The \PName{field list} argument is a comma-separated list of fields
to be shown. The following fields are supported:
\begin{labeling}[~--]{\PValue{location}}
\item[\PValue{test}] is a 10\Unit{cm} by 15\Unit{cm} test field, 1\Unit{cm}
  from the top and left edges of the paper. This field exists for debugging.
  You can use it as a benchmark to check whether the measurements have been
  distorted during the creation of the document.
\item[\PValue{head}] is the header area of the letterhead page. This field
  is open at the bottom.
\item[\PValue{foot}] is the footer area of the letterhead page. This field is
  open at the top.
\item[\PValue{address}] is the address window area used by window envelopes.
\item[\PValue{location}] is the field for the extra sender information.
\item[\PValue{refline}] is the reference line. This field is open at the
  bottom.
\end{labeling}%
\BeginIndex{FontElement}{field}\LabelFontElement{field}%
You can change the colour of the visualisation with
the\DescRef{scrlttr2.cmd.setkomafont} and \DescRef{scrlttr2.cmd.addtokomafont}
(see \autoref{sec:scrlttr2.textmarkup},
\DescPageRef{scrlttr2.cmd.setkomafont}) commands using the
\FontElement{field}\important{\FontElement{field}} element. The default is
\Macro{normalcolor}.%
\EndIndex{FontElement}{field}%
%
\EndIndexGroup


\begin{Declaration}
  \Macro{setshowstyle}\Parameter{style}%
  \Macro{edgesize}
\end{Declaration}
By default, \File{visualize.lco} indicates the individual areas with
frames\important{\PValue{frame}}, which corresponds to the \PName{style}
\PValue{frame}. Areas open at top or bottom are not completely framed but have
an open edge with with small arrows pointing up or down.
Alternatively\important{\PValue{rule}}, you can use the \PName{style}
\PValue{rule}. In this case, the area is highlighted by a background colour.
It isnot possible to distinguish open and closed areas. Instead a minimal
height will be used for open areas. The third\important{\PValue{edges}}
available \PName{style} is \PValue{edges}, which shows the corners of the
areas. The corner marks at the open edge of open areas will be omitted. The
size of two edges of the corner marks are given by the \Macro{edgesize} macro
with a default of 1\Unit{ex}.%
\EndIndexGroup


\begin{Declaration}
  \Macro{showenvelope}\AParameter{width\textup{,}height}%
                      \AParameter{h-offset\textup{,}v-offset}%
                      \OParameter{instructions}%
  \Macro{showISOenvelope}\Parameter{format}\OParameter{instructions}%
  \Macro{showUScommercial}\Parameter{format}\OParameter{instructions}%
  \Macro{showUScheck}\OParameter{instructions}%
  \Macro{unitfactor}
\end{Declaration}
If you have loaded \File{visualize.lco}, you can use these commands to output
a page with a drawing of an envelope. The envelope drawing is always rotated
by 90\textdegree{} on a separate page and printed in 1:1~scale. The addressee
window is generated automatically from the current data for the address
position of the letterhead page: \PLength{toaddrvpos}, \PLength{toaddrheight},
\PLength{toaddrwidth}, and \PLength{toaddrhpos}. To do so requires knowing how
much smaller the folded letter pages are than the width and height of the
envelope. If you do not specify these two values, \PName{h-offset} and
\PName{v-offset}, when calling \Macro{showenvelope}, they are calculated from
the fold marks and the paper size itself.

The \Macro{showISOenvelope}, \Macro{showUScommercial}, and \Macro{showUScheck}
commands are based on \Macro{showenvelope}. With \Macro{showISOenvelope}, you
can create ISO-envelopes in C4, C5, C5/6, DL (also known as C5/6) or C6
\PName{format}. With \Macro{showUScommercial}, you can create a US commercial
envelope in the 9 or 10 \PName{format}. You can use \Macro{showUScheck} for
envelopes in US check format.

\BeginIndex{FontElement}{letter}\LabelFontElement{letter}%
The position of the letterhead page inside the envelope is indicated with
dashed lines. You can change the colour of these lines with the
\DescRef{scrlttr2.cmd.setkomafont} and \DescRef{scrlttr2.cmd.addtokomafont}
(see \autoref{sec:scrlttr2.textmarkup},
\DescPageRef{scrlttr2.cmd.setkomafont}) using the
\FontElement{letter}\important{\FontElement{letter}} element. The default is
\Macro{normalcolor}.%
\EndIndex{FontElement}{letter}%

\BeginIndex{FontElement}{measure}\LabelFontElement{measure}%
The envelope drawing will be provided with dimensions automatically. You can
change the colour of these dimension labels with the commands
\DescRef{scrlttr2.cmd.setkomafont} and \DescRef{scrlttr2.cmd.addtokomafont}
(see \autoref{sec:scrlttr2.textmarkup},
\DescPageRef{scrlttr2.cmd.setkomafont}) using the
\FontElement{measure}\important{\FontElement{measure}} element. The default is
\Macro{normalcolor}. The dimensions are given in multiples of
\Length{unitlength}, with an accuracy of $1/\Macro{unitfactor}$, where the
accuracy of \TeX{} arithmetic is the actual limits. The default is 1. You can
redefine \Macro{unitfactor} using \Macro{renewcommand}.%
\EndIndex{FontElement}{measure}%

\begin{Example}
  You are generating a sample letter using the ISO-A4 format. The supported
  fields should be marked with yellow borders to check their position.
  Furthermore, the position of the window for a DL-size envelope should be
  checked with drawing. The dimension lines in this drawing should be red, and
  the numbers should use a smaller font, with the dimensions printed in cm
  with an accuracy of 1\Unit{mm}. The dashed letterhead page in the envelope
  should be coloured green.
\begin{lstcode}
  \documentclass[visualize]{scrlttr2}
  \usepackage{xcolor}
  \setkomafont{field}{\color{yellow}}
  \setkomafont{measure}{\color{red}\small}
  \setkomafont{letter}{\color{green}}
  \showfields{head,address,location,refline,foot}
  \usepackage[british]{babel}
  \usepackage{lipsum}
  \begin{document}
  \setkomavar{fromname}{Joe Public}
  \setkomavar{fromaddress}{2 Valley\\
                           SAMPLEBY\\
                           ZY32 1XW}
  \begin{letter}{%
      1 Hillside\\
      SAMPLESTEAD\\
      WX12 3YZ%
    }
  \opening{Hello,}
  \lipsum[1]
  \closing{Good bye}
  \end{letter}
  \setlength{\unitlength}{1cm}
  \renewcommand*{\unitfactor}{10}
  \showISOenvelope{DL}
  \end{document}
\end{lstcode}
  This will show the letterhead page as the first page and the drawing of the
  envelope on the second page.
\end{Example}

Note that poorly chosen combinations of \Length{unitlength} and
\Macro{unitfactor} can quickly lead to a \TeX{} \emph{arithmetic overflow}
error. The dimension numbers shown may also differ slightly from the actual
values. Neither are errors in \Option{visualize} but merely implementation
limitations of \TeX.
%
\EndIndexGroup
%
\EndIndexGroup
%
\EndIndexGroup


\section{Language Support}
\seclabel{languages}%
\BeginIndexGroup
\BeginIndex{}{languages}%

The \Class{scrlttr2} class and the \Package{scrletter} package support many
languages. These include German\Index{language>German} (\PValue{german} for
the old German orthography, \PValue{ngerman} for the new orthography;
\PValue{austrian} for Austrian with the old German orthography,
\PValue{naustrian}\ChangedAt{v3.09}{\Class{scrlttr2}} for Austrian with the
new orthography; and \PValue{nswissgerman}\ChangedAt{v3.13}{\Class{scrlttr2}}
for Swiss German with the new orthogrphy, \PValue{swissgerman} for Swiss
German with the old orthography), English\Index{language>English} (among
others, \PValue{english} without specification as to whether American or
British should be used, \PValue{american} and \PValue{USenglish} for American
English, and \PValue{british} and \PValue{UKenglish} for British English),
French\Index{language>French}, Italian\Index{language>Italian},
Spanish\Index{language>Spanish}, Dutch\Index{language>Dutch},
Croatian\Index{language>Croatian}, Finnish\Index{language>Finnish},
Norwegian\Index{language>Norwegian}\ChangedAt{v3.02}{\Class{scrlttr2}},
Swedish\Index{language>Swedish}\ChangedAt{v3.08}{\Class{scrlttr2}},
Polish\ChangedAt{v3.13}{\Class{scrlttr2}},
Czech\ChangedAt{v3.13}{\Class{scrlttr2}}, and Slovak.

You can switch languages using the \Package{babel}\IndexPackage{babel} package
(see \cite{package:babel}) with the \Macro{selectlanguage}\Parameter{language}
command.  Other packages like \Package{german}\IndexPackage{german} (see
\cite{package:german}) and \Package{ngerman}\IndexPackage{ngerman} (see
\cite{package:ngerman}) also define this command.  As a rule though, the
language selection occurs immediately as a direct consequence of loading such
a package.
\iffalse% Umbruchkorrekturtext
For details, please refer to the documentation of the relevant packages.
\fi

There\textnote{Attention!} is one more point to note about language-switching
packages. The
\Package{french}\IndexPackage{french}\important{\Package{french}} package (see
\cite{package:french}) makes changes well beyond redefining the terms in
\autoref{tab:scrlttr2-experts.languageTerms}. For instance, it redefines the
\DescRef{scrlttr2.cmd.opening} command, since the package simply assumes that
\DescRef{scrlttr2.cmd.opening} is always defined as it is in the standard
\Class{letter} class. This, however, is not the case with \KOMAScript{}. The
\Package{french} package thus overwrites the definition and does not work
correctly with \KOMAScript. I regard this as a fault in the \Package{french}
package which, although reported decades ago, was unfortunately never
eliminated.

If you use the \Package{babel}\IndexPackage{babel} package to switch to
\PValue{french}, problems can occasionally occur. With \Package{babel},
however, you can usually deactivate changes to a language in a targeted
manner.%
\iffalse% This is actually outdated!
\ If the package \Package{french} is not installed, the problem with
  \Package{babel} does not arise. Similarly, the problem usually does not
  exist when you use \Package{babel} with other varieties of French such as
  \PValue{acadian}, \PValue{canadien}, \PValue{francais} or \PValue{frenchb}
  instead of \PValue{french}.
\fi

\iffalse% This is also outdated!
  However, with \Package{babel} version 3.7j and above, this problem only occurs
  if the option explicitly indicates that \Package{babel} should use the
  \Package{french} package.
%
\iftrue
  If you cannot be sure you are not using an old version of \Package{babel}, I
  recommend you use
\begin{lstcode}
  \usepackage[...,frenchb,...]{babel}
\end{lstcode}
  to select French.
    \iffalse %
      If necessary, you can still switch to French with
      \Macro{selectlanguage}\PParameter{french}.%
    \fi%
\fi 
\fi  

\iftrue
  It cannot be ruled out that similar problems will not occur with other
  languages or packages. For German and English, however, there are currently
  no known problems with the \Package{babel} package.
\fi


\begin{Declaration}
  \Macro{yourrefname}%
  \Macro{yourmailname}%
  \Macro{myrefname}%
  \Macro{customername}%
  \Macro{invoicename}%
  \Macro{subjectname}%
  \Macro{ccname}%
  \Macro{enclname}%
  \Macro{headtoname}%
  \Macro{headfromname}%
  \Macro{datename}%
  \Macro{pagename}%
  \Macro{mobilephonename}%
  \Macro{phonename}%
  \Macro{faxname}%
  \Macro{emailname}%
  \Macro{wwwname}%
  \Macro{bankname}
\end{Declaration}
These commands contain the language-dependent terms. These\important[i]{%
  \DescRef{scrbase.cmd.newcaptionname}\\
  \DescRef{scrbase.cmd.renewcaptionname}\\
  \DescRef{scrbase.cmd.providecaptionname}} definitions can be
modified to support a new language or for your private customization, as
described in
\autoref{sec:scrbase.languageSupport}. \KOMAScript{} sets these terms only in
\Macro{begin}\PParameter{document}. Therefore they are not available in the
preamble and cannot be redefined there. The default settings for
\Option{english} and \Option{ngerman} are listed in
\autoref{tab:scrlttr2-experts.languageTerms}.%
\EndIndexGroup
%\iffree{}{\clearpage}% Siehe Kommentar zur Tabelle

\begin{Declaration}
  \Macro{captionsacadian}
  \Macro{captionsamerican}
  \Macro{captionsaustralien}
  \Macro{captionsaustrian}
  \Macro{captionsbritish}
  \Macro{captionscanadian}
  \Macro{captionscanadien}
  \Macro{captionscroatian}
  \Macro{captionsczech}
  \Macro{captionsdutch}
  \Macro{captionsenglish}
  \Macro{captionsfinnish}
  \Macro{captionsfrancais}
  \Macro{captionsfrench}
  \Macro{captionsgerman}
  \Macro{captionsitalian}
  \Macro{captionsnaustrian}
  \Macro{captionsnewzealand}
  \Macro{captionsngerman}
  \Macro{captionsnorsk}
  \Macro{captionsnswissgerman}
  \Macro{captionspolish}
  \Macro{captionsslovak}
  \Macro{captionsspanish}
  \Macro{captionsswedish}
  \Macro{captionsswissgerman}
  \Macro{captionsUKenglish}
  \Macro{captionsUSenglish}
\end{Declaration}
If you change the language of a letter, the language-dependent terms listed in
\autoref{tab:scrlttr2-experts.languageTerms},
\autopageref{tab:scrlttr2-experts.languageTerms} are redefined using these
commands. If your language-switching package does not support this, you can
also use the above commands directly.
%
\begin{table}
  \begin{minipage}{\textwidth}
  \centering
%    \KOMAoptions{captions=topbeside}%
%    \setcapindent{0pt}%
   \caption[{%
        Defaults for language-dependent terms
      }]{%
        Defaults for language-dependent terms for the languages
        \Option{english} and \Option{ngerman}, if they are not already defined
        by the packages used for language switching%
        \label{tab:scrlttr2-experts.languageTerms}%
      }[l]
      \begin{tabular}[t]{lll}
        \toprule
        Command         & \Option{english} & \Option{ngerman} \\
        \midrule
        \Macro{bankname}     & Bank account   & Bankverbindung \\
        \Macro{ccname}\footnotemark[1]       & cc             & Kopien an \\
        \Macro{customername} & Customer no.   & Kundennummer \\
        \Macro{datename}     & Date           & Datum \\
        \Macro{emailname}    & Email          & E-Mail \\
        \Macro{enclname}\footnotemark[1]     & encl           & Anlagen \\
        \Macro{faxname}      & Fax            & Fax \\
        \Macro{headfromname} & From           & Von \\
        \Macro{headtoname}\footnotemark[1]   & To             & An \\
        \Macro{invoicename}  & Invoice no.    & Rechnungsnummer \\
        \Macro{myrefname}    & Our ref.       & Unser Zeichen \\
        \Macro{pagename}\footnotemark[1]     & Page           & Seite \\
        \Macro{mobilephonename} & Mobile phone & Mobiltelefon \\
        \Macro{phonename}    & Phone          & Telefon \\
        \Macro{subjectname}  & Subject        & Betrifft \\
        \Macro{wwwname}      & Url            & URL \\
        \Macro{yourmailname} & Your letter of & Ihr Schreiben vom\\
        \Macro{yourrefname}  & Your ref.      & Ihr Zeichen \\
        \bottomrule
      \end{tabular}
      \deffootnote{1em}{1em}{1\ }% brutal aber effektiv
      \footnotetext[1000]{Normally these terms are defined by language
        packages like \Package{babel}. In this case, \KOMAScript{} does not
        redefine them. The actual wording may therefore differ and can
        be found in the documentation for the language package used.}
%    \end{captionbeside}
  \end{minipage}
\end{table}
%
\EndIndexGroup
\iffree{}{\clearpage}% Umbruchkorrektur

\begin{Declaration}
  \Macro{dateacadian}
  \Macro{dateamerican}
  \Macro{dateaustralien}
  \Macro{dateaustrian}
  \Macro{datebritish}
  \Macro{datecanadian}
  \Macro{datecanadien}
  \Macro{datecroatian}
  \Macro{dateczech}
  \Macro{datedutch}
  \Macro{dateenglish}
  \Macro{datefinnish}
  \Macro{datefrancais}
  \Macro{datefrench}
  \Macro{dategerman}
  \Macro{dateitalian}
  \Macro{datenaustrian}
  \Macro{datenewzealand}
  \Macro{datengerman}
  \Macro{datenorsk}
  \Macro{datenswissgerman}
  \Macro{datepolish}
  \Macro{dateslovak}
  \Macro{datespanish}
  \Macro{dateswedish}
  \Macro{dateswissgerman}  
  \Macro{dateUKenglish}
  \Macro{dateUSenglish}
\end{Declaration}
Depending on the language used, the numerical representation of the date\Index{date} (see option
\DescRef{scrlttr2.option.numericaldate} in \autoref{sec:scrlttr2.firstpage},
\DescPageRef{scrlttr2.option.numericaldate}) is formatted in various ways.
The exact format can be found in \autoref{tab:date}.%
\EndIndexGroup
%
\EndIndexGroup
\iffree{}{\clearpage}% Umbruchkorrektur zwecks Ausgabe der Tabellen

\begin{table}[!tp]% Umbruchoptimierung
%  \centering
  \KOMAoptions{captions=topbeside}%
  \setcapindent{0pt}%
%  \caption
  \begin{captionbeside}{Language-dependent forms of the date}[l]
  \begin{tabular}[t]{ll}
    \toprule
    Command & Date Example \\
    \midrule
      \Macro{dateacadian}   & 24.\,12.\,1993\\
      \Macro{dateamerican}  & 12/24/1993\\
      \Macro{dateaustralien}& 24/12/1993\\
      \Macro{dateaustrian}  & 24.\,12.\,1993\\
      \Macro{datebritish}   & 24/12/1993\\
      \Macro{datecanadian}  & 1993/12/24\\
      \Macro{datecanadien}  & 1993/12/24\\
      \Macro{datecroatian}  & 24.\,12.\,1993.\\
      \Macro{dateczech}     & 24.\,12.\,1993\\
      \Macro{datedutch}     & 24.\,12.\,1993\\
      \Macro{dateenglish}   & 24/12/1993\\
      \Macro{datefinnish }  & 24.12.1993.\\
      \Macro{datefrancais}  & 24.\,12.\,1993\\
      \Macro{datefrench}    & 24.\,12.\,1993\\
      \Macro{dategerman}    & 24.\,12.\,1993\\
      \Macro{dateitalian}   & 24.\,12.\,1993\\
      \Macro{datenaustrian} & 24.\,12.\,1993\\
      \Macro{datenewzealand}& 24/12/1993\\
      \Macro{datengerman}   & 24.\,12.\,1993\\
      \Macro{datenorsk}     & 24.12.1993\\
      \Macro{datenswissgerman}   & 24.\,12.\,1993\\
      \Macro{datepolish}    & 24.\,12.\,1993\\
      \Macro{dateslovak}    & 24.\,12.\,1993\\
      \Macro{datespanish}   & 24.\,12.\,1993\\
      \Macro{dateswedish}   & 24/12 1993\\
      \Macro{dateswissgerman}    & 24.\,12.\,1993\\
      \Macro{dateUKenglish} & 24/12/1993\\
      \Macro{dateUSenglish} & 12/24/1993\\
    \bottomrule
  \end{tabular}
  \end{captionbeside}
  \label{tab:date}
\end{table}
%
\section{Obsolete Commands in \Class{scrlttr2}}
\seclabel{obsolete}
\BeginIndexGroup

\LoadNonFree{scrlttr2-experts}{1}
\EndIndexGroup
%
\iffalse% Es wird Zeit das komplett rauszuwerfen!
\section{From Obsolete \Class{scrlettr} to Current \Class{scrlttr2}}
\seclabel{fromscrlettr}

With\textnote{Attention!} the 2002 release of \Class{scrlttr2} (see
\autoref{cha:scrlttr2}), the old letter class, \Class{scrlettr}, became
obsolete, and it is no longer part of \KOMAScript. If you still need the class
or information about it, you will find it in
\cite{package:koma-script-obsolete}.

To facilitate the transition to the new class, there is the compatibility
option \Option{KOMAold}. Basically, all the older functionality still
exists in the new class.  Without \Option{KOMAold}, however, the user
interface and the defaults are different. More details on
this option are provided in \autoref{sec:scrlttr2.lcoFile},
\autoref{tab:lcoFiles}.

\LoadNonFree{scrlttr2-experts}{2}
%
\EndIndexGroup
\fi
%
\EndIndexGroup

\endinput

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