Theory
owl:equivalentClass is mutual subclassing — every instance of A is an instance of B and vice versa. Useful when bridging two vocabularies that name the same concept differently.
How it compares to its weaker sibling, rdfs:subClassOf:
| Construct | Direction | Use it when… |
|---|---|---|
rdfs:subClassOf | one-way (A → B) | A is a kind of B but B may be broader |
owl:equivalentClass | two-way (A ↔ B) | A and B are the same set under two names |
owl:sameAs | two-way, instances | Two IRIs refer to the same individual |