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我可以在索引中添加脚注（或一段文字）吗？

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我可以在索引中添加脚注（或一段文字）吗？

在撰写关于现象 X 的文章时，我在整个文档中使用了太多次首字母缩略词 X。我还使用了许多其他首字母缩略词。似乎我不应该为首字母缩略词 X 包含一长串页码，而是可以在索引上方的一段话中说明，但最好在索引的脚注中说明类似“由于文档的主题是 X，并且提到次数太多，因此未将其包含在索引中”的内容。

希望能够帮助更改下面的 MWE，以便在索引下方打印脚注（首选），或在索引上方打印一段文本。

\documentclass{memoir}
\usepackage{makeidx}
\makeindex
\begin{document}

This document is about X. But it also mentions Y\index{Y}, Z\index{Z}, as well as A\index{A}, B\index{B} and C\index{C}.

% As this document is about X and it is used too many times throughtout the text, it is not included in the index.
\printindex
\end{document}

答案1

有一个钩子\preindexhook，可以重新定义为在索引标题和索引条目之间插入内容：

\documentclass{memoir}
\usepackage{makeidx}
\makeindex
\begin{document}

This document is about X. But it also mentions Y\index{Y}, Z\index{Z}, as
well as A\index{A}, B\index{B} and C\index{C}.

\renewcommand*{\preindexhook}{%
  As this document is about X and it is used too many times throughout the
  text, it is not included in the index.\par
  \indexspace
}
\printindex
\end{document}

结果

我认为索引附加文本的最佳位置是索引标题和条目之间。作为脚注，文本只会扰乱条目列表。

由于默认索引使用双列布局，因此脚注有点棘手。以下示例将脚注作为单列脚注放在索引的第一页上。双列条目由multicols具有平衡列的环境设置：

\documentclass[a5paper]{memoir}

\usepackage{multicol}

\makeatletter
\newif\ifindex@multicols
\renewenvironment{theindex}{%
  \clearforchapter
  \if@twocolumn
    \@restonecolfalse
  \else
    \@restonecoltrue
  \fi
  \ifonecolindex
    \onecolumn
    \chapter*{\indexname}
    \preindexhook
  \else
    \setlength{\columnseprule}{\indexrule}%
    \setlength{\columnsep}{\indexcolsep}%
    %\twocolumn[
      \@makeschapterhead{\indexname\footnotemark}%
      \footnotetext{\indexfootnotetext}%
      \preindexhook
    %]
    \index@multicolstrue 
    \begin{multicols}{2}%
  \fi
  \indexmark
  \ifnoindexintoc\else
    \phantomsection
    \addcontentsline{toc}{chapter}{\indexname}%
  \fi
  \thispagestyle{indextitlepagestyle}\parindent\z@
  \parskip\z@ \@plus .3\p@\relax
  \let\item\@idxitem
}{%
  \ifindex@multicols
    \end{multicols}%
  \else
    \if@restonecol\onecolumn\else\twocolumn\fi
  \fi
}
\makeatother

\makeindex
\newcommand*{\indexfootnotetext}{%
  As this document is about X and it is used too many times throughout the
  text, it is not included in the index.%
}

\begin{document}
  \chapter{First chapter}
  This document is about X. But it also mentions Y\index{Y}, Z\index{Z}, as
  well as A\index{A}, B\index{B} and C\index{C}.

  \printindex
\end{document}

结果脚注

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