rdf11:rdf_assert/3

rdf_assert(+S, +P, +O) is det
rdf_assert(+S, +P, +O, +G) is det: Assert a new triple. If O is a literal, certain Prolog terms are translated to typed RDF literals. These conversions are described with rdf_canonical_literal/2.
If a type is provided using Value^^Type syntax, additional conversions are performed. All types accept either an atom or Prolog string holding a valid RDF lexical value for the type and xsd:float and xsd:double accept a Prolog integer.