{ "items" : [
    { "id" : "http://ns.inria.fr/covid19/PMC4619528#body_text"
      "properties" : {
        "http://purl.org/dc/terms/subject" : [ "Potatoes",
          "Molecular biology",
          "Water desalination",
          "British black-and-white films",
          "Genes"] } } }
