示例代码：
\documentclass{amsart}
\begin{document}
\title[Short]{Long}
\maketitle
Hello
\end{document}
使用 tex4ebook 编译时， 的可选参数\title被错误地处理（标题为Short]Long）。
答案1
tex4ebook重新定义\title命令以将其内容保存在可用于元数据生成的宏中。标准类不使用可选参数\title，因此tex4ebook不要指望这一点。通常，使用不同数量的参数重新定义标准 LaTeX 宏并不是一个好主意。
无论如何，我已经更新tex4ebook以处理这种情况，这是更新后的tex4ebook.sty软件包：
% Package tex4ebook. Author Michal Hoftich <[email protected]>
% This package is subject of LPPL license, version 1.3
\ProvidesPackage{tex4ebook}[2016/03/31 version 0.1d]
\RequirePackage{etoolbox}
\RequirePackage{kvoptions}
\RequirePackage{graphicx}
% Command for generating NCX file. Hard work is odne in the file
% tex4ebook.4ht
\def\ncxtable{}
% Command for generating OPF file
\def\opftable{}
%Declare RFC3066 language code for babel language name
\def\DeclareLanguage#1#2{%
\csgdef{rfclang#1}{#2}%
}
\def\GetLanguage{%
\ifx\bbl@main@language\@undefined en-US%
\else%
\ifcsdef{rfclang\bbl@main@language}{\csuse{rfclang\bbl@main@language}}{}%
\fi%
}
\DeclareLanguage{UKenglish}{en-GB}
\DeclareLanguage{USenglish}{en-US}
\DeclareLanguage{acadian}{fr}
\DeclareLanguage{albanian}{sq}
\DeclareLanguage{american}{en-US}
\DeclareLanguage{amharic}{am}
\DeclareLanguage{arabic}{ar}
\DeclareLanguage{armenian}{hy}
\DeclareLanguage{australian}{en-US}
\DeclareLanguage{austrian}{de}
\DeclareLanguage{basque}{eu}
\DeclareLanguage{bengali}{bn}
\DeclareLanguage{brazilian}{pt}
\DeclareLanguage{brazil}{pt}
\DeclareLanguage{breton}{br}
\DeclareLanguage{british}{en-GB}
\DeclareLanguage{bulgarian}{bg}
\DeclareLanguage{canadian}{en-US}
\DeclareLanguage{canadien}{fr}
\DeclareLanguage{catalan}{ca}
\DeclareLanguage{croatian}{hr}
\DeclareLanguage{czech}{cs-CZ}
\DeclareLanguage{danish}{da}
\DeclareLanguage{divehi}{dv}
\DeclareLanguage{dutch}{nl}
\DeclareLanguage{english}{en}
\DeclareLanguage{esperanto}{eo}
\DeclareLanguage{estonian}{et}
\DeclareLanguage{finnish}{f\/i}
\DeclareLanguage{francais}{fr}
\DeclareLanguage{french}{fr}
\DeclareLanguage{galician}{gl}
\DeclareLanguage{germanb}{de}
\DeclareLanguage{german}{de}
\DeclareLanguage{greek}{el}
\DeclareLanguage{hebrew}{he}
\DeclareLanguage{hindi}{hi}
\DeclareLanguage{hungarian}{hu}
\DeclareLanguage{icelandic}{is}
\DeclareLanguage{interlingua}{ia}
\DeclareLanguage{irish}{ga}
\DeclareLanguage{italian}{it}
\DeclareLanguage{kannada}{kn}
\DeclareLanguage{khmer}{km}
\DeclareLanguage{korean}{ko}
\DeclareLanguage{lao}{lo}
\DeclareLanguage{latin}{la}
\DeclareLanguage{latvian}{lv}
\DeclareLanguage{lithuanian}{lt}
\DeclareLanguage{lowersorbian}{dsb}
\DeclareLanguage{magyar}{hu}
\DeclareLanguage{malayalam}{ml}
\DeclareLanguage{marathi}{mr}
\DeclareLanguage{naustrian}{de}
\DeclareLanguage{newzealand}{en}
\DeclareLanguage{ngerman}{de}
\DeclareLanguage{norsk}{no}
\DeclareLanguage{norwegiannynorsk}{nn}
\DeclareLanguage{nynorsk}{no}
\DeclareLanguage{occitan}{oc}
\DeclareLanguage{oldchurchslavonic}{cu}
\DeclareLanguage{persian}{fa}
\DeclareLanguage{polish}{pl-PL}
\DeclareLanguage{polutonikogreek}{el}
\DeclareLanguage{portuges}{pt}
\DeclareLanguage{portuguese}{pt}
\DeclareLanguage{romanian}{ro}
\DeclareLanguage{romansh}{rm}
\DeclareLanguage{russian}{ru}
\DeclareLanguage{samin}{se}
\DeclareLanguage{sanskrit}{sa}
\DeclareLanguage{scottish}{gd}
\DeclareLanguage{serbian}{sr}
\DeclareLanguage{serbo-croatian}{sh}
\DeclareLanguage{slovak}{sk}
\DeclareLanguage{slovene}{sl}
\DeclareLanguage{slovenian}{sl}
\DeclareLanguage{spanish}{es}
\DeclareLanguage{swedish}{sv}
\DeclareLanguage{tamil}{ta}
\DeclareLanguage{telugu}{te}
\DeclareLanguage{thai}{th}
\DeclareLanguage{tibetan}{bo}
\DeclareLanguage{turkish}{tr}
\DeclareLanguage{turkmen}{tk}
\DeclareLanguage{ukrainian}{uk}
\DeclareLanguage{uppersorbian}{hsb}
\DeclareLanguage{urdu}{ur}
\DeclareLanguage{vietnamese}{vi}
\DeclareLanguage{welsh}{cy}
\AtEndDocument{%
\ncxtable
\opftable
}
% Default empty values
\def\Title{Unnamed}
\def\Author{Anonymous}
% We need to save values of title, author etc.
\let\origtitle\title
% normal \title
\newcommand\tftitle[1]{%
\origtitle{#1}%
\let\Title\@title%
}
% \title with optional argument
\newcommand\tfopttitle[2][]{%
\origtitle[#1]{#2}%
\let\Title\@title%
}
% some classes (amsart) define \title command with optional argument
\renewcommand\title{%
\@ifnextchar[\tfopttitle\tftitle%
}
\let\origauthor\author
\renewcommand\author[1]{%
\origauthor{#1}%
\let\Author\@author
}
%\let\Author\@author
\let\Date\today
\let\origdate\date
\renewcommand\date[1]{%
\origdate{#1}%
\let\Date\@date%
}
%}
\newcommand\coverimage[2][]{\includegraphics[#1]{#2}}
