[msavazzi]

Originally Posted by theducks

An empty book creates everything that any other format does EXCEPT there is no format file.

This is how I documented my Paper Library (note the only ting missing from this view is Book Formats)

You can even calibre search for these

formats:false

FWIW I have not tried to attach other 'data' files to one of these, simply because I don't use that feature ANYWHERE.

Sounds like what I want to do but I did not understood what im means "format:false" where you put it?
how you create the opf?

Thanks