\begin{omgroup}[id=mcr]{Making Crossreferences}
\begin{omtext} 
 in the omgroup 
\end{omtext} 
\end{omgroup} 
\newpage
\begin{omgroup}[id=rad]{Referencing across Documents}
Now, we test the referencing mechanism
\begin{omtext}[title=Internal Referencing]
  First single refrences: \sref{mcr} (\spageref{mcr}) and \sref{rad} (\spageref{rad}),
  and then compound ones: \srefs{mcr}{rad}
\end{omtext}
 
\begin{omtext}[title=External Referencing]
  First single references: \extref{scr}{setup} (\extpageref{scr}{setup}) and
  \extref{scr}{testing} (\extpageref{scr}{testing})
\end{omtext}
\end{omgroup} 
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