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Advanced RDF
Resource Description Framework (RDF)–rich expressivity is achieved by means of an extendable set of terms grouped into vocabularies. However, the RDF core specifications include only a small number of general-purpose terms. Most RDF terms (including domain specific terms) are defined in third-party vocabularies by relevant standardization forums, organizations, or even individuals. Vocabularies define terms together with precise semantics for them. Users of a vocabulary are expected to understand the definitions and the semantics.*
RDF Schema and OWL
One of the most important vocabularies is the RDF Vocabulary Description Language (Brickley and Guha 2004), usually referred to as RDF schema (prefix rdfs:, namespace defined ...
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