Summary
RDFS is the schema language for RDF; it describes constructs for types of objects (Classes), relating types to one another (subClasses), properties that describe objects (Properties), and relationships between them (subProperty). The Class system in RDFS includes a simple and elegant notion of inheritance, based on set inclusion; one class is a subclass of another means that instances of the one are also instances of the other.
The RDFS language benefits from the distributed nature of RDF by being expressed in RDF itself. All schema information (classes, subclasses, subproperties, domain, range, etc.) is expressed in RDF triples. In particular, this makes schema information, as well as data, subject to the AAA slogan: Anyone can say Anything ...
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