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% http://texwelt.de/wissen/fragen/23968/
\documentclass{article}
\usepackage{xsim}
% new property:
\DeclareExerciseProperty{shortsolution}
% new environment:
\NewDocumentEnvironment{shortsolution}{+b}
{\SetExerciseProperty{shortsolution}{#1}}
{}
% we'll use a description list for the list of short solutions:
\newcommand\printshortsolutions{%
\begin{description}
\ForEachUsedExerciseByType{%
\def\ExerciseType{##1}%
\def\ExerciseID{##2}%
\GetExercisePropertyT{shortsolution}
{%
\item[Short Solution ##3]
####1%
}%
}%
\end{description}
}
\begin{document}
\section{Problems}
% set shortsolution through option:
\begin{exercise}[subtitle=Pythagoras]
This is the first problem.
\end{exercise}
\begin{shortsolution}
This is a shortsolution to the first problem.
\end{shortsolution}
\begin{solution}
This is the solution to the first problem.
\end{solution}
\begin{exercise}[subtitle=Another Problem]
This is the second problem.
\end{exercise}
\begin{solution}
This is the solution to the second problem.
\end{solution}
% set shortsolution with custom command:
\begin{exercise}[subtitle=Yet Another Problem]
This is the third problem.
\end{exercise}
\begin{shortsolution}
This is a shortsolution to the third problem.
\end{shortsolution}
\begin{solution}
This is the solution to the third problem.
\end{solution}
\section{Shortsolutions}
\printshortsolutions
\section{Solutions}
\printsolutions[headings=false]
\end{document}
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