%%
%% The LaTeX Companion, 3ed
%%
%% Example 3-5-40 on page I-231 in "enotez --- Endnotes, an alternative to footnotes".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{135.0pt}

\setlength\parindent{0pt}

% for the book examples we shorten the vertical spaces
\makeatletter
\renewcommand\section{\@startsection{section}{1}{\z@}%
                                    {-1.25ex \@plus-1ex \@minus-.2ex}%
                                    {.5ex}%
                                    {\normalfont\large\bfseries}}
\makeatother

%StartShownPreambleCommands
\usepackage[inline]{enumitem}
  \setlist[itemize]{itemjoin=\hspace{1em plus 2pt}}

\usepackage{enotez}
  \setenotez{list-name={Section Notes}}
  \DeclareInstance{enotez-list}{inline}{list}
                  {list-type = itemize*}
  \AtEveryEndnotesList{General introductory text\ldots}
%StopShownPreambleCommands

\begin{document}
This is text.\endnote{The first\endnote{A nested
    note\ldots\endnote{\ldots which itself contains a
  note.}} endnote.\endnote{Another second-level note with
    more text to show its formatting in the note section.}}
And this is more text.\endnote{The third
  endnote.\endnote{Also with a second-level note.}}
\printendnotes[inline]
\end{document}