{ "items" : [
    { "id" : "http://webisa.webdatacommons.org/314415775"
      "properties" : {
        "http://www.w3.org/1999/02/22-rdf-syntax-ns#type" : [ "http://www.w3.org/ns/prov#Entity" ] ,
        "http://www.w3.org/ns/prov#value" : [ "In fact it is mostly the system that support backward chaining that really use the &quot;null&quot; as a meta information stating that the value of a slot in not known." ] ,
        "http://www.w3.org/ns/prov#wasQuotedFrom" : [ "w3.org" ] } },

    { "id" : "http://webisa.webdatacommons.org/prov/498000376"
      "properties" : {
        "http://www.w3.org/ns/prov#wasDerivedFrom" : [ "http://webisa.webdatacommons.org/314415775"] } } }
