Hello,
I use Sigil 1.9.30. In my content.opf file, I have added a collection tag to the package version="3.0" tag. When I save the file, the collection tag is removed and its link child elements are moved into the metadata tag.
If the collection tag is supported in Sigil, how to create it?
https://www.w3.org/publishing/epub/e...kg-collections