Quote:
	
	
		
			
				
					Originally Posted by  ViktorShchedrin
					 
				 
				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. 
			
		 | 
	
	
 I had missed that new item. 

So I clicked it once: All those books have ISBN in the metadata.
I clicked it again (Red - )
Those did not have ISBN entries

 Doesn't anyont ever 'just try' somethin (Discovery process) anymore? Calibre does try and prevent total 'foot shooting' (Yes, I know someone who shot his own foot practicing 'quick draws' with a loaded gun)