How can I print exercise with ID in xsim?

Question

I have some exercises with ID.

\documentclass{report}
\usepackage[paperwidth=17cm, paperheight=24cm, left=2cm,right=2cm,top=2cm,bottom=2cm]{geometry}
\usepackage{fouriernc}
\usepackage{xsim,pgffor}
\usepackage{needspace}
\DeclareExerciseEnvironmentTemplate{runin}
{%
\par\vspace{\baselineskip}
\Needspace * {2\baselineskip}
\noindent
\textbf{\XSIMmixedcase{\GetExerciseName}~\GetExerciseProperty{counter}}%
\GetExercisePropertyT{subtitle}{ \textit{#1}} %
\GetExercisePropertyT{points}{%
\marginpar{%
\PropertyValue
\GetExercisePropertyT{bonus-points}{+\PropertyValue}%
\,\IfExerciseGoalSingularTF{points}
 {\XSIMtranslate{point}}
{\XSIMtranslate{points}}%
 }%
 }%
 }
 {}
\xsimsetup{
exercise/within=section ,
exercise/template=runin,
solution/template=runin,
solution/print = true,
exercise/the-counter = \thesection.\arabic{exercise}.}
\DeclareExerciseCollection{exam}

\begin{document}
\chapter{AAA}
\section{BBB}
\collectexercises{exam}
\begin{exercise}[ID=q1]
  1
\end{exercise}
\begin{solution}
  1
\end{solution}
\begin{exercise}[ID=q2]
  2
\end{exercise}
\begin{solution}
  2
\end{solution}
\begin{exercise}[ID=q3]
  3
\end{exercise}
\begin{solution}
  3
\end{solution}
\begin{exercise}[ID=q4]
  4
\end{exercise}
\begin{exercise}[ID=q5]
  5
\end{exercise}
\begin{exercise}[ID=q6]
  6
\end{exercise}
\begin{exercise}[ID=q7]
  7
\end{exercise}
\begin{exercise}[ID=q8]
  8
\end{exercise}
\begin{exercise}[ID=q9]
  9
\end{exercise}

\begin{exercise}[ID=q10]
  10
\end{exercise}
\printcollection{all exercises}
\section{Print with ID}
\printexercise{exercise}{q3}

\section{Answers}
\printsolutions
\end{document} 

Now I want to print one (or some) exercise. I tried

\printexercise{exercise}{q3}

or

\printexercise{exercise}{q1,q3,q5}

But I can't get the result. How can I get it?

Answer 1

I tried [...]

\printexercise{exercise}{q1,q3,q5}

That actually doesn't make much sense as it doesn't follow the command description of \printexercise (p.19 of the current manual):

• \printexercise{<type>}{<id>}
  Inserts the exercise of type <type> with the id <id>.

It is important to notice expects the id whereas in the question you tried to use the ID (p.10 of the current manual):

• id = {<integer>}
  Holds the internal id of an exercise. Cannot be set by the user.
• ID = {<text>}
  Holds the user id of an exercise if defined. Otherwise it is equal to id.

---

Here is a way that works:

\documentclass{article}
\usepackage{xsim}
\begin{document}

\begin{exercise}[ID=foo]
  bla bla
\end{exercise}

\XSIMexpandcode{\printexercise{exercise}{\GetExerciseIdForProperty{ID}{foo}}}

\end{document}

or probably better

\documentclass{article}
\usepackage{xsim}

\newcommand*\insertexercise[1]{%
  \XSIMexpandcode{\printexercise{exercise}{\GetExerciseIdForProperty{ID}{#1}}}%
}

\begin{document}

\begin{exercise}[ID=foo]
  bla bla
\end{exercise}

\insertexercise{foo}

\end{document}