{ "items" : [
    { "id" : "http://ns.inria.fr/covid19/PMC7094226#body_text"
      "properties" : {
        "http://purl.org/dc/terms/subject" : [ "Breast milk",
          "Breastfeeding",
          "Milk",
          "Infant feeding",
          "Publicly traded companies based in New York City",
          "Cities in Virginia"] } } }
