message: debug the json result
diff: @@ -247,7 +247,7 @@ ResultSet::to_JSON()
  string data_type = "http://www.w3.org/2001/XMLSchema#string-complete";
  string ans_str_new = ans_str.substr(1, pos - 1);
  _buf << "\"" + this->var_name[j].substr(1) + "\": { ";
  - _buf << "\"type\": \"" + ans_type + "\", \"datatype\": \"" + data_type + "\",\"oldvalue\":"+ Util::node2string((string("\"") + ans_str + "\"").c_str())+"\", \"value\": " + Util::node2string((string("\"") + ans_str_new + "\"").c_str()) + " }";
  + _buf << "\"type\": \"" + ans_type + "\", \"datatype\": \"" + data_type + "\",\"oldvalue\":"+ Util::node2string((string("\"") + ans_str + "\"").c_str())+", \"value\": " + Util::node2string((string("\"") + ans_str_new + "\"").c_str()) + " }";
  list_empty = false;
  }
  }
  