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The predicates below form an experimental interface to provide more
reasoning inside the kernel of the rdb_db engine. Note that
transitive are not yet
supported by the rest of the engine. Also note that there is no relation
to defined RDF properties. Properties that have no triples are not
reported by this predicate, while predicates that are involved in
triples do not need to be defined as an instance of rdf:Property.
symmetric(true)is the same as
inverse_of(Predicate), i.e., creating a predicate that is the inverse of itself.
rdf_subject_branch_factorproperty, uniqueness of the object value is computed from the hash key rather than the actual values.
rdf_subject_branch_factor, but also considering triples of `subPropertyOf' this relation. See also rdf_has/3.
rdf_object_branch_factor, but also considering triples of `subPropertyOf' this relation. See also rdf_has/3.