Quote:
Originally Posted by eschwartz
I don't think calibre updates fields to empty, since that could mean wiping data accidentally -- although some people control their db metadata well enough that it would be intentional. 
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If I clear Comments in a book and do a Polish then the resultant EPUB in the library has no Comments in it. If I delete a cover from a book and do a Polish the resultant EPUB has no cover on it.
But if I clear Publisher & Tags and do a Polish then the Publisher & Tags remain the same.

Hmmmm
BR