True when Predicate is a currently known predicate. Predicates
are created if a triples is created that uses this predicate or
a property of the predicate is set using rdf_set_predicate/2.
The predicate may (no longer) have triples associated with it.
Note that resources that have rdf:type
rdf:Property
are
not automatically included in the result-set of this predicate,
while all resources that appear as the second argument of a
triple are included.
- See also
- - rdf_predicate_property/2.