code: public String[] get_class_attribute_list(Database database, String classname, String wildcard) throws DevFailed {
          if (!database.isAccess_checked()) checkAccess(database);
  
          DeviceData argIn = new DeviceData();
          argIn.insert(ApiUtil.toStringArray(classname, wildcard));
          DeviceData argOut = command_inout(database, "DbGetClassAttributeList", argIn);
          return argOut.extractStringArray();
      }
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