```protobuf enum Order { ORDER_NONE = 0; ORDER_ASC = 1; // ascending ORDER_DECR = 2; // decreasing } ``` ## Example | Score| Desc | |--------|--------| | Map<int32, Item>\|{order:ORDER_INCR }| string| | Item's score| Item's desc | | 1| desc1 | | 5| desc5 | | 8| desc8 |