Internal and User Categories = Identifiers
Calibre left side vertical bar has Authors, Series, Formats, Rating, News, Tags, Identifiers, Genres (thanks to Charles !), Searches
What is Identifiers for ? can i delete identifier from the Indentifiers list (isbn for example) ? Can i manage Identifiers as Series or Publishers or Tags ?
Is Identifiers related to the book data ? if i see Identifier = "[5798] isbn" - does this mean that 5798 books have 5798 isbn into the book file structure ?
Thank you.
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