ネストされたリストを参照する場合、項目とサブ項目のラベルの間にドットを配置するにはどうすればよいでしょうか。

Question

最初の項目への参照としてAiではなくAiを使用したい

\documentclass[twoside]{book}
\usepackage{enumerate}

\begin{document}  
\begin{enumerate}[A.]
  \item\label{FirstItem} First Item
  \begin{enumerate}[i.]
    \item\label{FirstSub} First Subitem
  \end{enumerate}
\end{enumerate}%[A.]
To reference the First Item,  \ref{FirstItem} and the first subitem, \ref{FirstSub}.
\end{document}

Answer 1

申し訳ありませんが、以前の回答は BS でした。これは有効です:

追加するだけ\makeatletter\renewcommand{\p@enumii}{\theenumi.}\makeatother

\documentclass[twoside]{book}
\usepackage{enumerate}
\makeatletter\renewcommand{\p@enumii}{\theenumi.}\makeatother
\begin{document}  
\begin{enumerate}[A.]
\item\label{FirstItem}
First Item
\begin{enumerate}[i.]
\item\label{FirstSub}
First Subitem
\end{enumerate}
\end{enumerate}%[A.]
To reference the First Item,  \ref{FirstItem} and the first subitem, \ref{FirstSub}.
\end{document}

---

古い回答:

追加するだけ\renewcommand{\labelenumii}{\theenumi.\theenumii}

\documentclass[twoside]{book}
\usepackage{enumerate}
\renewcommand{\labelenumii}{\theenumi.\theenumii}
\begin{document}  
\begin{enumerate}[A.]
\item\label{FirstItem}
First Item
\begin{enumerate}[i.]
\item\label{FirstSub}
First Subitem
\end{enumerate}
\end{enumerate}%[A.]
To reference the First Item,  \ref{FirstItem} and the first subitem, \ref{FirstSub}.
\bigskip
I want to have A.i instead of Ai.   I could put the dot myself if I could make the reference to the subitem just print i, which I also can't figure out.
\end{document}

Answer 2

enumitemの代わりに、次のキーを使用enumerateできますref:

\documentclass[twoside]{book}

\usepackage{enumitem}

\begin{document}  



\begin{enumerate}[label=\Alph*.]
\item\label{FirstItem}
First Item

\begin{enumerate}[label=\roman*.,ref=\theenumi\roman*]% \theenumi is the first level counter
\item\label{FirstSub}
First Subitem
\end{enumerate}

\end{enumerate}%[A.]


To reference the First Item,  \ref{FirstItem} and the first subitem,
\ref{FirstSub}.
\bigskip

I want to have A.i instead of Ai.   I could put the dot myself if I could make the reference to the subitem just print i, which I also can't figure out.



\end{document}