{ "items" : [
    { "id" : "http://dbpedia.org/resource/Upgrader"
      "properties" : {
        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "An upgrader is a facility that upgrades bitumen (extra heavy oil) into synthetic crude oil.  Upgrader plants are typically located close to oil sands production, for example, the Athabasca oil sands in  Alberta, Canada or the Orinoco tar sands in Venezuela."] } } }
