RDF Schema (variously abbreviated as RDFS, RDF(S), RDF-S, or RDF/S) is a set of classes with certain properties using the RDF extensible knowledge representation language, providing basic elements for the description of ontologies, otherwise called RDF vocabularies, intended to structure RDF resources. These resources can be saved in a triplestore to reach them with the query language SPARQL.

The first version was published by the World-Wide Web Consortium (W3C) in April 1998, and the finalW3C recommendation was released in February 2004. Many RDFS components are included in the more expressive language Web Ontology Language (OWL).

RDFS constructs are the RDFS classes, associated properties and utility properties built on the limited vocabulary of RDF.

A typical example of an rdfs:Class is foaf:Person in the Friend of a Friend (FOAF) vocabulary. An instance of foaf:Person is a resource that is linked to the class foaf:Person using the rdf:type property, such as in the following formal expression of the natural language sentence : 'John is a Person'.

James Brian "Jim" McCusker (born May 19, 1936 in Jamestown, New York) is a former professional American football defensive tackle in the National Football League (NFL) and the American Football League (AFL). He played for the NFL's Chicago Cardinals (1958), Philadelphia Eagles (1959–1962), and Cleveland Browns (1963) and the AFL's New York Jets (1964). He now owns a restaurant and bar called "The Pub" in his hometown of Jamestown, NY with his wife, Mary.