Previously we just expected 'title', 'subtitle', 'author', 'date'. Now we still support those, but also support the format recommended for epub metadata in the pandoc README: --- title: - type: main text: My Book - type: subtitle text: An investigation of metadata creator: - role: author text: John Smith - role: editor text: Sarah Jones identifier: - scheme: DOI text: doi:10.234234.234/33 publisher: My Press rights: (c) 2007 John Smith, CC BY-NC ...