All things being described by ResourceDescriptionFramework expressions are called RDF resources. A resource may be a WikiPage. A resource may also be an object that is not directly accessible via the Web; e.g. a printed book. Resources are always named by UniformResourceIdentifier plus optional anchor ids. 

See also: http://www.w3.org/TR/REC-rdf-syntax/#basic | ResourceDescriptionFramework | SemanticWikiWikiWeb | ...
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CategorySemanticWeb