Statistics of RDF Schemas
Most of the ontologies were developed in breadth rather than in depth
- when a small number of classes is defined, the number of properties is relatively big and vice versa
The majority of ontologies do not use the subPropertyOf construct. In cases it is used:
- is used mainly for relations (range classes) rather than attributes (range literals)
- top-level properties are most of the times unconstrained (no domain/range restriction)
Multiple inheritance for classes is far more widely used than multiple inheritance for properties
- Multiple inheritance for properties appears only once in the set of the ontologies examined
Multiple classification of resources was used only once in the instance files of the ontologies examined
The only actually reused RDF Schema is Dublin Core