On 07/10/2023 15:21, Ihor Radchenko wrote:
> Maske<maske1foro@gmail.com>  writes:
>
>> The headings could be in different files, yes.
>>
>> AFAIK, citations don't link two exact points. Footnotes do.
> Do you mean that you also want to jump back-and-forth between footnote
> definition in the another file and its footnote references?


Right: With C-c.

And maybe there could work directly commands like "org-footnote-action", 
being unneeded to create new commands like "org-note-action" with almost 
the same functionality.


>
>> I don't understand the option of "include", but I think it wouldn't be
>> the case.
> Seehttps://orgmode.org/manual/Include-Files.html
Thanks, I save it.
>
>> I really think footnotes would be a particular case of this option.
>>
>> ** Reference in file A
>> :PROPERTIES:
>> :ID:       978-84-362-7195-9
>> :END:
>>
>> ...
>> A “comment line” starts with a hash character (#)
>> *[n:102@978-84-362-7195-9]* and either a whitespace character or the
>> immediate end of the line.
>> ...
>>
>>
>> ** Notes in file B
>>
>> *[n:102@978-84-362-7195-9]* The hash character is important in orgmode.
> May you explain the purpose of @978-84-... part?
> You seem to assume that a footnote always has a single reference,
> which may or may not be the case in practice.

If there would be more than one reference, a behavior like that of footnotes would be appropriate?

The purpose of the @978-84-... part:
@978-84-362-7195-9 would work like the ID for internal links: [[id:978-84-362-7195-9]]. That would allow jumping to the correct heading from any file.
I am not a programmer, so the syntax I am sure could be more solid.  Example:


** Reference in file A
:PROPERTIES:
:ID:       978-84-362-7195-9
:END:
...
A “comment line” starts with a hash character (#) [n:102@978-84-362-7195-9] and either a whitespace character or the immediate end of the line.
...


** Notes in file B
[[id:978-84-362-7195-9]]: Link to heading in file A

[n:102@978-84-362-7195-9]: Link to an exact point in file A. Where the point is defined by the LABEL 102, and the file can be find thanks to the ID 978-84-362-7195-9