设置其他选择键的 LaTeX3 选择键

Question

我正在尝试设置可以隐式设置其他选择键的选择键。在“父”键和“从属”键中，选择集具有相同的值。

下面的代码或多或少满足了我的要求；如果我传递选项reset-question = section，那么每次开始新部分时，问题环境的计数器都会重置。但是，如果我给问题添加前缀（带question-prefix = section），它应该始终重置该级别的键，而不管键的值是什么reset-question（即，如果已定义，则覆盖该键）。

\documentclass{article}
\usepackage{xparse}
\usepackage{expl3}
\usepackage{l3keys2e}
\usepackage{chngcntr}

\setlength\parindent{0pt}

\begin{document}

\ExplSyntaxOn

\newcounter{question}
\keys_define:nn { teachingtools } {
    reset-question .default:n = section,
    reset-question .choices:nn = {
        part, chapter, section, subsection, subsubsection, paragraph, subparagraph
    }
    {
        \counterwithin*{question}{ \tl_to_str:N \l_keys_choice_tl }
    },
    reset-question / none .code:n = {
        \counterwithout*{question}{section}
    },
}

\tl_new:N \l_@@_question_prefix_tl
\keys_define:nn { teachingtools } {
    question-prefix .choice:, 
    question-prefix / part .code:n = {
        \tl_set:Nn \l_@@_question_prefix_tl { \arabic{part} }
        \keys_set:nn { teachingtools } { reset-question = part }
    },
    question-prefix / chapter .code:n = {
        \tl_set:Nn \l_@@_question_prefix_tl { \arabic{chapter} }
        \keys_set:nn { teachingtools } { reset-question = chapter }
    },
    question-prefix / section .code:n = {
        \tl_set:Nn \l_@@_question_prefix_tl { \arabic{section} }
        \keys_set:nn { teachingtools } { reset-question = section }
    },
    question-prefix / subsection .code:n = {
        \tl_set:Nn \l_@@_question_prefix_tl { \arabic{subsection} }
        \keys_set:nn { teachingtools } { reset-question = subsection }
    },
    question-prefix / subsubsection .code:n = {
        \tl_set:Nn \l_@@_question_prefix_tl { \arabic{subsubsection} }
        \keys_set:nn { teachingtools } { reset-question = subsubsection }
    },
    question-prefix / paragraph .code:n = {
        \tl_set:Nn \l_@@_question_prefix_tl { \arabic{paragraph} }
        \keys_set:nn { teachingtools } { reset-question = paragraph }
    },
    question-prefix / subparagraph .code:n = {
        \tl_set:Nn \l_@@_question_prefix_tl { \arabic{subparagraph} }
        \keys_set:nn { teachingtools } { reset-question = subparagraph }
    },
    question-prefix / none .code:n = {
        \tl_gclear:N \l_@@_question_prefix_tl 
    },
    question-prefix .default:n = none,
    question-prefix .initial:n = none,
}
\tl_put_right:Nn \l_@@_question_title_tl { \l_@@_question_prefix_tl }

\NewDocumentCommand \ttsetup { m } {
    \keys_set:nn { teachingtools } {#1}
}
\ExplSyntaxOff


\ttsetup{
  % reset-all = false,
  % reset-question = subsection,
    question-prefix = section
}


\end{document}

question-prefix尝试按照下一个代码示例来简化定义是行不通的。

\documentclass{article}
\usepackage{xparse}
\usepackage{expl3}
\usepackage{l3keys2e}
\usepackage{chngcntr}

\setlength\parindent{0pt}

\begin{document}

\ExplSyntaxOn

\newcounter{question}
\keys_define:nn { teachingtools } {
    reset-question .default:n = section,
    reset-question .choices:nn = {
        part, chapter, section, subsection, subsubsection, paragraph, subparagraph
    }
    {
        \counterwithin*{question}{ \tl_to_str:N \l_keys_choice_tl }
    },
    reset-question / none .code:n = {
        \counterwithout*{question}{section}
    },
}

\tl_new:N \l_@@_question_prefix_tl
\keys_define:nn { teachingtools } {
    question-prefix .choices:nn = { 
        part, chapter, section, subsection, subsubsection, paragraph, subparagraph
    }
    {
        \tl_set:Nn \l_@@_question_prefix_tl { \arabic{ \tl_to_str:N \l_keys_choice_tl } }
        \keys_set:nn { teachingtools } { reset-question = \tl_to_str:N \l_keys_choice_tl }
    },
    question-prefix / none .code:n = {
        \tl_gclear:N \l_@@_question_prefix_tl 
    },
    question-prefix .default:n = none,
    question-prefix .initial:n = none,
}
\tl_put_right:Nn \l_@@_question_title_tl { \l_@@_question_prefix_tl }

\NewDocumentCommand \ttsetup { m } {
    \keys_set:nn { teachingtools } {#1}
}
\ExplSyntaxOff


\ttsetup{
  % reset-all = false,
  % reset-question = subsection,
    question-prefix = section
}


\end{document}

相反，我收到以下错误消息：

|'''''''''''''''''''''''''''''''''''''''''''''''
| The key 'teachingtools/reset-question' only accepts predefined values, and
| 'section' is not one of these.
|...............................................

这没有意义，因为section是 的有效选择reset-section，所以有些东西没有以正确的格式传递。我在question-prefix .choices:nn代码块中尝试了各种方法，包括将选择值转换为字符串、获取其整数值以及直接传递令牌列表。我还没有尝试将reset-question和question-prefix 键分配给组。

为什么这不起作用？ 是否可以清理或优化第一部分中的代码？