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Sorry, I know English is not your first language, but I'm having trouble understanding your description.
What are "tags"? Do you mean metadata? Or PDF bookmarks? Or something else?
What you describe about structured file names does not seem to have anything to do with recursion to me.
So, if I've got this right, what this program does, is take some files whose names are of a form like:
Charles Dickens - Oliver Twist.pdf
and edits the metadata of the file so that the author is "Charles Dickens" and the title is "Oliver Twist" -- is that right?
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