xsim and "conditional" printing

Question

I'd like to know if the following is possible with the xsim package:

• Could the space created by commands like \blank[width=4.8\linewidth,linespread=1.5]{} (as given in the manual) not be printed if solution/print is set to true?
• Could a part of the document that is not a question be printed only if a particular tag is selected?

In other words, I'd like to achieve the following:

\documentclass{article}
\usepackage{xsim}
\xsimsetup{
solution/print = true,
tags = A
}

\begin{document}

% This part would be printed only if the tag A was selected.    
\somecommand{Instruction for A} 

\begin{exercise}[tags={A, B}]
    Tell me your mood
% Those lines would *not* be printed if solution/print is set to true.
\blank[width=4.8\linewidth,linespread=1.5]{} 
\end{exercise}

\end{document}

I've read the documentation but can't figure out whenever this is possible or not.

Answer 1

There is currently no user command which checks if a tag has been set but it is easy to add one. I'll add something to the next release.

If you want to check if solutions are printed then use \IfSolutionPrintTF or one of its cousins:

\documentclass{article}
\usepackage{xsim}

\xsimsetup{
  solution/print = true,
  tags = A
}

\ExplSyntaxOn
% v0.11 will contain some command like this:
\NewDocumentCommand \IfTagSetTF {m+m+m}
  { \seq_if_in:NnTF \l__xsim_chosen_tags_tags_seq {#1} {#2} {#3} }
\NewDocumentCommand \IfTagSetT {m+m}
  { \IfTagSetTF {#1} {#2} {} }
\NewDocumentCommand \IfTagSetF {m+m}
  { \IfTagSetTF {#1} {} {#2} }
\ExplSyntaxOff

\begin{document}

\IfTagSetT{A}{Instruction for A} 

\begin{exercise}[tags={A, B}]
  Tell me your mood
  \IfSolutionPrintT{\par\blank[width=4.8\linewidth,linespread=1.5]{} }
\end{exercise}

\end{document}