Availability:
:- use_module(library(semweb/rdf11)).
[semidet]rdf_is_object(@Term)Success of this goal does not imply that the object term in well-formed or that it is present in the database (see rdf_object/1 for that).
Since any RDF term can appear in the object position, this is equaivalent to rdf_is_term/1.