{ "items" : [
    { "id" : "http://dbpedia.org/resource/Deductive-nomological_model"
      "properties" : {
        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "The deductive-nomological model (DN model), also known as Hempel's model or Hempel–Oppenheim model or Popper–Hempel model, is a formal view of scientifically answering questions asking, \"Why...?\"."] } } }
