Thanks for answer @hube2
Then I will adapt my question: in your opinion is it better name the fields like prefix_author, prefix_genre, prefix_book_year (where prefix is a unique prefix, that could be my name or the name of my client’s company) or book_author, book_genre, book_year (where book identifies the post type)?
In the first case I can fall in conflicts if I will need to add another fields group to the same target.
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