:- use_module(library(semweb/rdf_db)). [det]rdf_set_predicate(+Predicate, 
+Property)
[det]rdf_set_predicate(+Predicate, 
+Property)symmetric(true) is the same as inverse_of(Predicate), 
i.e., creating a predicate that is the inverse of itself.inverse_of([]).
The transitive property is currently not used. The symmetric 
and inverse_of properties are considered by rdf_has/3,4 
and
rdf_reachable/3.