OK this is strange. I've done many, many books with Sigil over the past couple of years, and have used the Metadata Editor function to add series and series index. Took it for granted that these entries were in there "out of the box".
Reading this, I went to look, opening Sigil with no book in place, and I find that in the "Add Metadata" panel there is no entry for series and series index.
So I loaded a book I've recently done, and there they are. But if you look inside the opf file itself, they appear like this example:
Code:
<meta name="calibre:series" content="Robert Macdonald" />
<meta name="calibre:series_index" content="16" />
I have made all these books starting with the ODT Import plugin. Does this plugin add the "calibre:series" and "calibre:series_index" to the basic metadata editor somehow? The "calibre" part is not seen in the Metadata Editor, just series and series index.
Curious! The entries in the above opf were entered as in this image: