From semantic-mediawiki.org

RDF (Resource Description Framework) is a standard data model. It basically builds on anything being expressed as triples, i.e. statements of the form subject - predicate - object. An example is

<http://example.org/id/John> <http://example.org/id/Has_wife> <http://example.org/id/Mary>

saying that John has Mary as a wife (or, more exactly, that the property holds between the subject and the object).

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Further resources[edit]

(Wikidata Q54872).