% !Mode:: "TeX:DE:UTF-8:Main"
% !! needs lualatex
% this sets the hyphen used by automatic hyphenation to 00AD
% this improves copy&pasting
% the example gives aaaaaaa-aaaaaaaaaaaaa-aaaaaa Ministerpräsident
% when copied from adobe
% open problem: line ends are not copy&pasted as spaces.
% see also pull request #1, branch fake-space

\documentclass{book}

\usepackage[ngerman]{babel} %to get some hyphenation
\usepackage{tagpdf}
\tagpdfsetup{tabsorder=structure,
             activate-all, %deactivate to see the difference
             uncompress
             }
\usepackage{lipsum}%
\usepackage{fontspec}

\prehyphenchar`\^^ad

\pagestyle{empty}
\textwidth=1cm
\begin{document}
\tagstructbegin{tag=Document}
  \tagstructbegin{tag=P}
   \tagmcbegin{tag=P}
    aaaaaaa-aaaaaa aaaaaaa-aaaaaa
   \tagmcend
  \tagstructend

  \tagstructbegin{tag=P}
   \tagmcbegin{tag=P}
    Ministerpräsident
   \tagmcend
  \tagstructend
\tagstructend
\end{document}