Quote:
Originally Posted by Turtle91
From what I understand there is not a "spec" for epub metadata - other than the minimum Author, Title, Language - so I'm not sure why Sigil would bother deleting extra tags?
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There is a spec for metadata, including title, author, language, date, kewords (subject), description (summary)... It's just that unfortunately the series (and series number) metadata are sadly not included in the spec.
But the spec also allows for addition of arbitrary metada through <meta> tags, and that's how calibre adds series information, and how cover images (for thumbnails) are often specified. You probably can't add/edit these <meta> tags with Sigil's GUI, but you can edit the OPF file by hand.