Hello, I need to explain the function of the two files, with metadata. The directory author / book name I have books in ePub format. Here is a set metadata.opf where they are properly stored information about the genre of the book. After unpacking epub file contents.opf here is where the data is wrong, or before. When I corrected the genre, so I did not get it. Book reader takes infoemace just content.opf from the file, so there are inaccuracies. how it can be solved? Thank you all for your feedback.