prop 与 clist ： prop_get 返回 clist，而 prop_map_inline 不返回？

Question

我确信我遗漏了一些琐碎的东西（仍在学习 LaTeX3），但这看起来很奇怪：prop_map_inline 不会将值返回为 clist，即使它们是？

\documentclass{article}

\begin{document}

\ExplSyntaxOn
\prop_new:N \someProp

% put some data into prop:
\clist_set:Nn \l_tmpa_cl {a,b,c}
\clist_use:Nn \l_tmpa_cl {\ ---\ }
\prop_put:NnV \someProp {keyA} {\l_tmpa_cl}
\par

\clist_set:Nn \l_tmpa_cl {u,v,w,x,y,z}
\clist_use:Nn \l_tmpa_cl {\ ---\ }
\prop_put:NnV \someProp {keyB} {\l_tmpa_cl}
\par

% Direct access works fine; I get back a clist:
\prop_get:NnN \someProp {keyA} \l_tmpb_cl
\clist_use:Nn \l_tmpb_cl {\ ---\ }
\par 

% When iterating over property, value is no longer
% a clist, but just a string? 
\prop_map_inline:Nn \someProp { Key\ #1; \ 
  Values\ list:\ \clist_use:Nn #2 {\ ---\ } 
  \par } 

\prop_log:N \someProp

\ExplSyntaxOff

\end{document}

日志档案：

The property list \someProp contains the pairs (without outer braces):
>  {keyA}  =>  {a,b,c}
>  {keyB}  =>  {u,v,w,x,y,z}.

这似乎理应如此。??

Answer 1

您所需要的\clist_use:nn不是#2变量（如\l_tmpa_clist），而只是一个标记列表（a,b,c）。

\documentclass{article}

\begin{document}

\ExplSyntaxOn
\prop_new:N \l_karl_some_prop

% put some data into prop:
\clist_set:Nn \l_tmpa_clist {a,b,c}
\clist_use:Nn \l_tmpa_clist {\ ---\ }
\prop_put:NnV \l_karl_some_prop {keyA}\l_tmpa_clist
\par

\clist_set:Nn \l_tmpa_clist {u,v,w,x,y,z}
\clist_use:Nn \l_tmpa_clist {\ ---\ }
\prop_put:NnV \l_karl_some_prop {keyB}\l_tmpa_clist
\par


\prop_map_inline:Nn \l_karl_some_prop 
 { 
   Key\ #1; \ 
   Values\ list:\  \clist_use:nn {#2} {\ ---\ } 
   \par 
 } 

\ExplSyntaxOff

\end{document}