Quote:
Originally Posted by jo_by
Any suggestions about what's wrong with that package element? (I have no idea what a prefix attribute is or what is should look like!) And how can I maintain the changes that Calibre seems to want to remove?
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Most commercial Apple Books-compatible books contain package tags like the following one:
Code:
<package version="3.0" unique-identifier="bookid" xmlns="http://www.idpf.org/2007/opf" prefix="schema: http://schema.org/ rendition: http://www.idpf.org/vocab/rendition/# ibooks: http://vocabulary.itunes.apple.com/rdf/ibooks/vocabulary-extensions-1.0/" xml:lang="en-US">
which should work for your book.
You also might want to have a look at the
Apple Books Asset Guide.