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First released in 1999, [[Resource Description Framework |RDF]] was first intended to ''describe'' resources, in other words to declare [[metadata]] of resources in a standard way. A RDF description of a resource is a set of triples (''subject'', ''predicate'', ''object''), where ''subject'' represents the resource to be described, ''predicate'' a type of property relevant to this resource, whereas ''object'' can be data or another resource. The ''predicate'' itself is considered as a resource and identified by a URI. Hence, properties like "title", "author" are represented in RDF as resources, which can be used, in a recursive way, as ''subject'' of other triples.
Building on this recursive principle, RDF vocabularies, such as [[RDFS]], [[Web Ontology Language |OWL]], and [[SKOS]] will pile up definitions of abstract resources such as classes, properties, concepts, all identified by URIs.
RDF also specifies the definition of anonymous resources or [[Bnode | blank nodes]], which are not absolutely identified by URIs.
=== Using HTTP URIs to identify abstract resources ===
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