我有一份文件，每章前面都会显示一个摘要。摘要将列出后面段落中出现的重要点。
例如：
This chapter will talk about:
\printtopics
Section 1
Building a bridge is very easy. First start with some stones. Then,
\definetopic{How to build a temporary bridge from stones.}
find a narrow area in a river. Throw the stones into the river
until the river has completely stopped.
...
这将产生：
This chapter will talk about:
1. How to build a temporary bridge from stones.
2. How to hunt for rabbits.
3. How to find firewood.
Section 1
Building a bridge is very easy. First start with some stones. Then,
find a narrow area in a river. Throw the stones into the river
until the river has completely stopped.
...
使用\definetopic{How to build a temporary bridge from stones.}意味着将这些单词添加到列表中，并出现在章节开头的摘要中。
在 ConTeXt 中，如何定义要添加到列表中、出现在章节开头的项目，但在文档文本中定义它们？
答案1
您可以为此目的定义一个章节本地列表。
\definelist
[topics]
[criterium=chapter,
headnumber=always,
pagenumber=no]
\definecounter
[topic]
[way=bychapter]
\define[1]\definetopic{%
\incrementcounter[topic]%
\writetolist[topics]{\rawcountervalue[topic]}{#1}}
\starttext
\startchapter[title=Foo]
This chapter will talk about:
\placelist[topics]
\startsection[title=Bar]
\definetopic{How to build a temporary bridge from stones.}%
\input knuth
\definetopic{How to hunt for rabbits.}%
\input knuth
\definetopic{How to find firewood.}%
\input knuth
\stopsection
\stopchapter
\startchapter[title=Foo]
This chapter will talk about:
\placelist[topics]
\startsection[title=Bar]
\definetopic{How to hunt for rabbits.}%
\input knuth
\stopsection
\stopchapter
\stoptext
