owl:Thing is not useful

All your classes are declared

    rdfs:subClassOf owl:Thing

What do you need this for? Please remove.

If a user needs OWL reasoning, the reasoner will infer owl:Thing for every resource
- (GraphDB has pairs of rulesets, eg OWL2 RL vs OWL2 RL Optimized, and the latter doesn't infer this useless class)
With mere RDFS inference, the reasoner will still infer owl:Thing, and that would be just useless baggage

gs1 / WebVoc