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% needs 
%\usepackage{listings}
%\usepackage{tikz}
%\usetikzlibrary{fit,tikzmark}
%\usetikzlibrary{arrows.meta}
\lstset{basicstyle=\ttfamily,
        columns=flexible,
        escapechar=*,
        morecomment=[l]{\%},keepspaces=true,
        commentstyle=\color{green!50!black}\bfseries}
\tikzset{
  balloon/.style={
    draw,
    fill=blue!20,
    opacity=0.4,
    inner xsep=4pt,inner ysep=2pt,
    rounded corners=2pt,
    %minimum height=15pt
  },
  ref/.style={
  very thick, -Latex,red
  },
  iref/.style={
  thick,dashed, -Latex,red
  }
}
\NewDocumentCommand\balloon{m}{%
\node[fit={(pic cs:#1-first) (pic cs:#1-end)
([yshift=7pt]pic cs:#1-end)},balloon](#1){};}
\begin{tikzpicture}[overlay,remember picture]
\balloon{link}
\balloon{structparent}
\balloon{OBJR}
\balloon{linkref}
\balloon{structelem}
\balloon{kid}
\balloon{pnum}
\balloon{pref}
\draw[ref] (linkref)--(link);
\draw[ref] (link)--(structparent.170);
\draw[ref] (structparent.190)--(pnum);
\draw[ref] (pnum)--(pref);
\draw[ref] (pref)--(structelem);
\draw[ref] (structelem)--(kid);
\draw[ref] (kid)--(OBJR);
\draw[ref] (OBJR)--(linkref);
\end{tikzpicture}
\begin{lstlisting}[name=OBJR]
*\tikzmark{link-first}*18 0 obj*\tikzmark{link-end}*   %Link Object
<< /Type /Annot /Subtype/Link
   /Rect [ 196.109 494.573 399.167 506.831 ]
*\tikzmark{structparent-first}*/StructParent 16 *\tikzmark{structparent-end}*
 /A<</Type/Action /S/URI /URI(https://github.com/u-fischer/tagpdf)>>
 >>
endobj

*\tikzmark{OBJR-first}*19 0 obj*\tikzmark{OBJR-end}*   %Object reference (OBJR)
<</Type /OBJR /Obj *\tikzmark{linkref-first}*18 0 R*\tikzmark{linkref-end}* >>
endobj

*\tikzmark{structelem-first}*17 0 obj*\tikzmark{structelem-end}*   %Structure Element
<< /Type /StructElem /S /Link /P 11 0 R
/K [<</Type /MCR /Pg 8 0 R /MCID 6>> *\tikzmark{kid-first}*19 0 R*\tikzmark{kid-end}* ]>>
endobj};

5 0 obj   %Parenttree
<< /Nums
[... *\tikzmark{pnum-first}*16*\tikzmark{pnum-end}*     *\tikzmark{pref-first}*17 0 R*\tikzmark{pref-end}* ...] >>
endobj
\end{lstlisting}