Canonical IRIs from the RDF 1.1 vocabulary. See https://www.w3.org/TR/rdf11-concepts/.
rdf:type.
rdf:first (first element of an RDF list).
rdf:rest (tail of an RDF list).
rdf:nil (the empty RDF list).
rdf:langString (datatype for language-tagged literals).
rdf:Property (class of all RDF properties).
The RDF namespace IRI:
http://www.w3.org/1999/02/22-rdf-syntax-ns#.