Quote:
Originally Posted by crutledge
The means of adding semantics, e.g. Start Reading, not presently listed in Sigil.
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"Semantics" is a word I picked for the feature of adding whatever semantic information could be added to a file in the BB. The only "semantics" that exist are the ones I make up

. For instance, some of the semantic actions map to OPF <guide> element types, some map to special meta elements (like what's used to mark an image as the cover for iBooks etc.). Future one's could map to something else entirely. So when you ask me for "semantics" not present in Sigil but present elsewhere, that doesn't make any sense to me.
If you're talking about about different OPF <guide> element types like the ones used in mobi (I think this is what you're asking for), then no. The ones that are on offer are the ones that are listed in the epub spec.