https://plus.cs.aalto.fi/CS-E4410/2021spring/exercise_set_1/03_creating_foaf/?hl=en
2.4 Creating a FOAF profile | Semantic Web | A+
semantic webcreatingfoafprofile
https://ontolearner.readthedocs.io/benchmarking/social_sciences/foaf.html
Friend of a Friend (FOAF) -
of afriendfoaf