In the RDF Schema Language Model everything is a resource rdfs Resource itself is some type of a Class (i.e. type of Class), but everything is subclass of Resource. rdfs:[Class](/blog/619/) itself is defined to be a rdfs:[Class](/blog/619/). rdfs:Literal and rdf:Property are both are Resource and a subclass of Class. Numerous other Properties are of type Property of course (.e.g. rdfs:range, rdfs:domain, rdfs:subPropertOf, rdfs:subClassOf, rdfs:comment, rdf:type).
sub - subclass relation
type - instance relation
