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If you can do it in a plugin, that would be wonderful!
Please note that calibre:series and calibre:series_index have modern epub3 variants that should be properly supported in Sigil's built-in epub3 metadata editor and my ePub3-tizer plugin should happily convert them over.
Also note, any epub2 meta name and content metadata found in the epub3 should be automatically retained in the opf metadata by the Sigil epub3 metadata editor which only allows the user to change correct/known metadata and so will not show or remove the older meta tags, i.e., it follows the epub3 spec to ignore them.
The accessibility schema info from ACE should also be recognized by Sigil's builtin-in epub3 metadata editor. If not, that is a bug that I should fix.
Thanks!
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