Not really. That stuff does relate to "semantics" in the "Semantic Markup" sense, but it doesn't actually have much to do with the "Semantic Web" per-se. I mean, yeah, there is a weak sort of connection there, but when people talk about the "Semantic Web" they are mostly talking about RDF, whether it's encoded using RDF/XML, N3, Turtle, JSON-LD, or "other". And along with RDF are related technologies like OWL, inference engines that reason over a triplestore, etc.