code: public void delete_device_attribute(Database database, String deviceName, String attname) throws DevFailed {
          if (!database.isAccess_checked()) checkAccess(database);
  
          String[] array = new String[2];
          array[0] = deviceName;
          array[1] = attname;
          DeviceData argIn = new DeviceData();
          argIn.insert(array);
          command_inout(database, "DbDeleteDeviceAttribute", argIn);
      }
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