```
% pandoc -t native
Note[^1].
[^1]: the first note.
[^2]: the second, unused, note.
^D
2> [WARNING] Note with key '2' defined at line 5 column 1 but not used.
[ Para
[ Str "Note"
, Note
[ Str "the" , Space , Str "first" , Space , Str "note." ]
]
, Str "."