Contains a map of tables and their respective keys that were not processed with the current response, possibly due to reaching a limit on
            the response size. The UnprocessedKeys value is in the same form as a RequestItems parameter (so the value can be provided
            directly to a subsequent BatchGetItem operation). For more information, see the above RequestItems parameter.
             
            
Constraints:
 Declaration Syntax
 Declaration Syntax| C# | 
public Dictionary<string, KeysAndAttributes> UnprocessedKeys { get; set; }