是否可以将下面 MWE 中第 2 和第 5 个脚注中的脚注符号从数字更改为星号、匕首等？换句话说，是否可以对特定脚注使用非数字脚注符号？
\setuplayout [height=10cm]
\startdocument
First sentence.\footnote{This is a footnote given with the number 1.}
Second sentence.\footnote{This footnote should be given with an asterisk, but it isn't.}
Third sentence.\footnote{This footnote should be given with the number 2, but it isn't.}
Fourth sentence.\footnote{This footnote should be given with the number 3, but it isn't.}
Fifth sentece.\footnote{This footnote should be given with a dagger, but it isn't.}
\stopdocument
答案1
我在 ConTeXt 邮件列表中提出了这个问题（https://mailman.ntg.nl/mailman/listinfo/ntg-context) 汉斯·哈根 (Hans Hagen) 很快给出了答案:) 这是我得到的答案，略作修改：
\setupindenting
[yes,small]
\defineconversion
[mymix]
[a,b,c]
\definenotation
[symfootnote]
[footnote]
[counter=]
\setupnotation
[footnote]
[align={hz,hanging},
indenting={yes,small,next}]
\setupnotation
[symfootnote]
[align={hz,hanging},
indenting={yes,small,next},
numberconversion=mymix,
way=bypage]
\startdocument
This is the first sentence with a footnote.\footnote{This is the first footnote and its mark is "1".}
This is the second sentence with a footnote.\symfootnote{This is the second footnote and its mark is "a". }
This is the third sentence with a footnote.\footnote{This is the third footnote and its mark is "2". }
This is the fourth sentence with a footnote.\footnote{This is the fourth footnote and its mark is "3". }
This is the fifth sentence with a footnote.\symfootnote{This is the fifth footnote and its mark is "b". }
\stopdocument
除了定义自定义转换（上例中的“mymix”），我们还可以使用预定义转换“set 2”，它为我们提供了星号、匕首等，如下所示：
\setupindenting
[yes,small]
\definenotation
[symfootnote]
[footnote]
[counter=]
\setupnotation
[footnote]
[align={hz,hanging},
indenting={yes,small,next}]
\setupnotation
[symfootnote]
[align={hz,hanging},
indenting={yes,small,next},
numberconversion=set 2,
way=bypage]
\startdocument
This is the first sentence with a footnote.\footnote{This is the first footnote and its mark is "1".}
This is the second sentence with a footnote.\symfootnote{This is the second footnote and its mark is "∗". }
This is the third sentence with a footnote.\footnote{This is the third footnote and its mark is "2". }
This is the fourth sentence with a footnote.\footnote{This is the fourth footnote and its mark is "3". }
This is the fifth sentence with a footnote.\symfootnote{This is the fifth footnote and its mark is "†". }
\stopdocument
希望能帮助到你。