Gets and sets the property Prefix. An optional string that you want CloudFront to
            prefix to the access log    filenames for this distribution, for example, myprefix/.
               If you want to enable logging, but you do not want to specify a prefix, you   
            still must include an empty Prefix element in the Logging element.
            
 Declaration Syntax
 Declaration Syntax| C# | 
public string Prefix { get; set; }