The KeySchema identifies the primary key as a one attribute primary key (hash) or a composite two attribute (hash-and-range) primary key.
            Single attribute primary keys have one index value: a HashKeyElement. A composite hash-and-range primary key contains two attribute
            values: a HashKeyElement and a RangeKeyElement.
             
            
 Declaration Syntax
 Declaration Syntax| C# | 
public KeySchema KeySchema { get; set; }