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Semantic Web - Data
URIs are used to identify resources,not just things that exists on the Web, e.g. Tim Berners-Lee
RDF is used to make statements about resources in the form of triples
With RDFS, resources can belong to classes (my Mercedes belongs to the class of cars) and classes can be subclasses or superclasses of other classes (vehicles are a superclass of cars, cabriolets are a subclass of cars)