An opaque string that indicates the position at which the virtual tapes that were fetched for description ended. Use this marker in your
            next request to fetch the next set of virtual tapes in the virtual tape shelf (VTS). If there are no more virtual tapes to describe, this
            field does not appear in the response.
             
            
Constraints:
 Declaration Syntax
 Declaration Syntax| C# | 
public string Marker { get; set; }