You are right meant to write NTriples not N3 but editing on the phone is such a disaster. N3 adds a rule language next to the data description over RDF. XML dis

You are right meant to write NTriples not N3 but editing on the phone is such a disaster. N3 adds a rule language next to the data description over RDF. XML disallows a few things that are possible in turtle but in practical terms there are very few cases where that could make a possible difference, e.g. who has a \beep code point in their normal text. OWL is powerfull but hard like all description logics, they ar e tools that very very few developers really master. Yet can be used for very interesting things. Validation is not the goal of OWL and is therefore not well supported. ShACL or whatever comes out of W3C for schema descriptions and constraints will be easier and more performant for this use case. On the last para: yes, yes and yes. Very mature stack with a lot of competition and innovation. Cheers!