{ "items" : [
    { "id" : "http://dbpedia.org/resource/Sludge"
      "properties" : {
        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "Sludge is a semi-solid slurry and can be produced as sewage sludge from wastewater treatment processes or as a settled suspension obtained from conventional drinking water treatment and numerous other industrial processes."] } } }
