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One more detail. I created two columns, one for books with one author and other for books more than 2 authors. These columns is to put the nationality of the author. So far it works for me. However there is one detail that makes interesting that the required fields be included. If I need filter by a country, I only write "#nacionalidad: Spanish" and all books will be listed in the "#nacionalidad" field have the "Spanish" value. Same for the "#nacionalidades" field, where I include more than one nationality usually (unless all authors are of the same nationality).
The problem is that so I'll just have a list of all the books filtered, but, what if you want to have only a list of authors of a nationality? That could be if there was a field exclusively for that data. That's the main reason of my request. The Evernote method or mine is not the same, because it does not allow to filter correctly.
I hope I made myself clear. I just wanted explain better my request.
Sorry my grammar.
Blessings
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