I have many pdf with 100s of annotations/comments in them, created trought the free Adobe acrobat reader. By reading this official guide, and skimming trough related pages, I see that I can "export" the comments in FDF files or XFDF format.
However, this files can't be opened by themselves without the original, from the first link:
You cannot open and view FDF files or XFDF files on their own.
I would like to export the comments as a text file containing only the text of the comments. That is my request.