schema:about owl:equivalentProperty dct:subject

[chrpr]

https://github.com/dcmi/schema.org/blob/master/mappings_schema.org.xml#L57

Tom notes that "The relation should be subPropertyOf because the domain of schema:about is more restricted."

[bvatant]

Regarding domain we should be careful that schema.org itself does not attach properties to classes by a formal rdfs:domain declaration. This is the interpretation of schema.rdfs.org. See specific issue : "schema.org properties do not have formal domains"