EPUB (even v3) uses some Dublin Core metadata. Unlike the page the thread refers to it's presented as `<dc:title>` not `DC.Title` but other than that it's the

EPUB (even v3) uses some Dublin Core metadata. Unlike the page the thread refers to it's presented as `<dc:title>` not `DC.Title` but other than that it's the same thing. Only a handful of tags are used. https://idpf.org/epub/30/spec/epub30-publications.html#sec-metadata-elem