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# RDF Schema (RDFS) * * * RDF Schema (RDFS) is an extension of RDF. * * * ## RDF Schema and Application-specific Classes RDF describes resources using classes, properties, and values. Moreover, RDF requires a method to define application-specific classes and properties. Application-specific classes and properties must be defined using extensions to RDF. RDF Schema serves exactly this purpose. * * * ## RDF Schema (RDFS) RDF Schema does not provide actual application-specific classes and properties; instead, it provides a framework for describing application-specific classes and properties. Classes in RDF Schema are very similar to classes in object-oriented programming languages. This enables resources to be defined as instances of classes and as subclasses of classes. * * * ## RDFS Example The following example demonstrates some capabilities of RDFS: In the above example, the resource "horse" is a subclass of the class "animal". * * * ## Abbreviated Example Since an RDFS class is itself an RDF resource, we can abbreviate the above example by replacing `rdf:Description` with `rdfs:Class` and omitting the `rdf:type` information: That's it!