https://cliopatria.swi-prolog.org/swish/pldoc/man?section=pengine-examples
SWI-Prolog -- Pengine by examples
swi prologpengineexamples
https://cliopatria.swi-prolog.org/browse/list_triples_with_object?l=literal(%27pengine_property/2%27)
Triples with object pengine_property/2
triplesobjectpengineproperty