问题描述

• 将ACM latex模板中的XML代码按说明替换为:

%% The code below is generated by the tool at http://dl.acm.org/ccs.cfm.
%% Please copy and paste the code instead of the example below.
%%

\begin{CCSXML}
  <ccs2012>
     <concept>
         <concept_id>XXXXX</concept_id>
         <concept_desc>XXXXX</concept_desc>
         <concept_significance>500</concept_significance>
         </concept>
     <concept>
         <concept_id>XXXXX</concept_id>
         <concept_desc>XXXXX</concept_desc>
         <concept_significance>500</concept_significance>
         </concept>
   </ccs2012>
   \end{CCSXML}

\ccsdesc[500]{Human-centered computing~Ubiquitous and mobile computing systems and tools}
\ccsdesc[500]{Computing methodologies~Machine learning approaches}

• 编译报错：

*geometry* driver: auto-detecting
*geometry* detected driver: pdftex
(d:/texlive/2022/texmf-dist/tex/latex/upquote/upquote.sty)
Excluding 'CCSXML' comment.)
Runaway argument?
! File ended while scanning use of \next.
<inserted text>
                \par
<*> sample-sigconf.tex

?
! Emergency stop.
<inserted text>
                \par
<*> sample-sigconf.tex

问题解决

• 经尝试，删掉\end{CCSXML}前的空格后，成功编译：

\begin{CCSXML}
  <ccs2012>
     <concept>
         <concept_id>10003120.10003138.10003140</concept_id>
         <concept_desc>Human-centered computing~Ubiquitous and mobile computing systems and tools</concept_desc>
         <concept_significance>500</concept_significance>
         </concept>
     <concept>
         <concept_id>10010147.10010257.10010293</concept_id>
         <concept_desc>Computing methodologies~Machine learning approaches</concept_desc>
         <concept_significance>500</concept_significance>
         </concept>
   </ccs2012>
\end{CCSXML}

原因分析

• acmart模板对\end{CCSXML}前的空格敏感。这种敏感性主要是由于\excludecomment{CCSXML}宏的实现：
  • 下面是acmart.cls中的相关代码

\RequirePackage{comment}
\excludecomment{CCSXML}

• 可见：

  • acmart模板使用了comment宏包，该宏包提供了\excludecomment命令，可以在编译时忽略特定环境中的内容。

  • 然而，comment宏包对于\begin{…}和\end{…}之间的内容的处理方式是基于逐行文本匹配的。换句话说，它会在文档中查找以\end{CCSXML}开头的行来确定环境的结束。如果在\end{CCSXML}之前存在空格，宏包将无法识别这一行作为CCSXML环境的结束。这就是为什么将\end{CCSXML}前的空格去掉后，编译将不再报错。

  • 具体见comment package的文档：https://mirror-hk.koddos.net/CTAN/macros/latex/contrib/comment/comment.pdf 第一页：