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FOAF (friend of a friend) protocol is an RDF-based schema that uses semantic Web syntax to describe individuals and social networks. Experts describe it as an "ontology" that helps to order digital representations of relationship models.
Part of the idea behind FOAF is that semantic Web technologies and new syntactical systems facilitate a kind of “revolution” in data connection. Internet guru Tim Berners-Lee has written about how technologies like FOAF will change the ordering of data systems. One example is the use of FOAF in JSON-LD, a resource for adding linked data to online data models.