Multiple list of figures/tables for appendices with KOMA script

Question

I have two appendices. The first one contains only tables, while the second one has tables, figures and schemes. At the begin of each appendix I want the list of tables/figures to show up. I know how to do this, if there is only one list of tables/figures for the whole appendix. I followed Markus Kohm's guideline for that. This works fine with a single list, but not with my modifications for multiple lists. In addition for the second appendix, I want the tables, figures and schemes listed combined in one "appendix B list".

So, what I want it to look like is this:

Appendix A

Content

Table A.1 Table in Appendix A

Table A.2 Table in Appendix A

Appendix B

Content

Table B.1 Table in Appendix B

Figure B.1 Figure in Appendix B

Scheme B.1 Scheme in Appendix B

Table B.2 Table in Appendix B

This is what I thought should work, but which does not give the desired output:

\documentclass[listof=totoc]{scrbook}
\usepackage{tocbasic}
\newcommand{\entrynumberwithprefix}[2]{%
    \csname listof#1entryname\endcsname\ #2%
}%
\newlength{\loftnumwidth}
\setlength{\loftnumwidth}{5em}
\DeclareTOCStyleEntry[%
    entrynumberformat=\entrynumberwithprefix{lot},
    numwidth=\loftnumwidth,%
    indent=0pt,
]{tocline}{table}
\DeclareTOCStyleEntry[%
    entrynumberformat=\entrynumberwithprefix{lof},
    numwidth=\loftnumwidth,%
    indent=0pt,
]{tocline}{figure}
\DeclareNewTOC[%
    type=scheme,%
    types=schemes,%
    float,%
    floattype=4,% 
    name=Scheme,%
    tocentrynumberformat=\entrynumberwithprefix{los},
    tocentrynumwidth=\loftnumwidth,%
    tocentryindent=0pt,
]{los}
% new lists for appendices
\DeclareNewTOC[%
    listname={Content of Appendix A},%
]{lotA}
\DeclareNewTOC[%
    listname={Tables in Appendix B},%
]{lotB}
\DeclareNewTOC[%
    listname={Content of Appendix B},%
]{lofB}
\DeclareNewTOC[%
    listname={Schemes in Appendix B},%
]{losB}
\makeatletter
\newcommand{\useappendixtocs}{%
    \setcounter{figure}{0}%
    \setcounter{table}{0}%
    \KOMAoptions{listof=leveldown}
    \renewcommand{\ext@table}{lotA}%
    \renewcommand{\ext@figure}{lotB}%
    \renewcommand{\ext@figure}{lofB}%
    \renewcommand*{\ext@figure}{losB}%
}
\g@addto@macro\appendix{
    \useappendixtocs
}
\makeatother
\begin{document}
\tableofcontents
\listoffigures
\listoftables
\listofschemes
\chapter{Main Document}
\begin{table}
    \caption{Table in main document.}
\end{table}
\begin{figure}
    \caption{Figure in main document.}
\end{figure}
\begin{scheme}
    \caption{Scheme in main document.}
\end{scheme}
\appendix
\chapter{First appendix with tables only}
\listoftoc{lotA}
\begin{table}
    \caption{Table in appendix A.}
\end{table}
\chapter{Second appendix with figures, tables and schemes}
\listoftoc{lofB}%
\begin{table}
    \caption{Table in appendix B.}
\end{table}
\begin{figure}
    \caption{Figure in appendix B.}
\end{figure}
\begin{scheme}
    \caption{Scheme in appendix B.}
\end{scheme}
\begin{table}
    \caption{Table in appendix B.}
\end{table}
\end{document}

Answer 1

Here is a suggestion:

\documentclass[
  listof=totoc,
  listof=flat% <- added
]{scrbook}

\newcommand{\entrynumberwithprefix}[2]{%
    \csname listof#1entryname\endcsname\ #2%
}%

\DeclareTOCStyleEntry[
  entrynumberformat=\entrynumberwithprefix{lof}
]{tocline}{figure}
\DeclareTOCStyleEntry[
  entrynumberformat=\entrynumberwithprefix{lot}
]{tocline}{table}

\DeclareNewTOC[%
  type=scheme,%
  types=schemes,
  float,%
  floattype=4,%
  name=Scheme,%
  tocentryentrynumberformat=\entrynumberwithprefix{los},% <- option name changed
  counterwithin=chapter,% <- added
]{los}


\makeatletter
\newcommand\listofapp{%
  \DeclareNewTOC[%
    listname={Content of Appendix \thechapter},%
    setup=leveldown% <- needs KOMA-Script version 3.25
  ]{app\thechapter}%
  \unsettoc{app\thechapter}{totoc}%
  \renewcommand{\ext@figure}{app\thechapter}%
  \renewcommand{\ext@table}{app\thechapter}%
  \renewcommand{\ext@scheme}{app\thechapter}%
  \listoftoc{app\thechapter}%
}
\makeatother

\begin{document}
\tableofcontents
\listoffigures
\listoftables
\listofschemes

\chapter{Main Document}
\begin{table}
  \caption{Table in main document.}
\end{table}
\begin{figure}
  \caption{Figure in main document.}
\end{figure}
\begin{scheme}
  \caption{Scheme in main document.}
\end{scheme}

\appendix
\chapter{First appendix with tables only}
\listofapp
\begin{table}
  \caption{Table in appendix A.}
\end{table}

\chapter{Second appendix with figures, tables and schemes}
\listofapp
\begin{table}
  \caption{Table in appendix B.}
\end{table}
\begin{figure}
  \caption{Figure in appendix B.}
\end{figure}
\begin{scheme}
  \caption{Scheme in appendix B.}
\end{scheme}
\begin{table}
  \caption{Table in appendix B.}
\end{table}
\end{document}

Run three times to get:

Note that option setup for \DeclareNewTOC is introduced in KOMA-Script version 3.25. With former KOMA-Script versions you have to remove it and to add \setuptoc{app\thechapter}{leveldown}.