OWL 2 format support

[XVilka]

https://www.w3.org/TR/owl2-overview/

[phillord]

In case you are interested:

https://github.com/phillord/horned-owl

This is a rather higher-level interface than an RDF based one would be based on the OWL2 structural specification.

It's about half done. Rather backward from normal coding practice, the first half has taken 90% of the time, I expect the last half to follow quickly. It doesn't parse RDF yet, though, which is why I was looking at this repository:-)