'Declaration

Public Property Subtype As System.String

public System.String Subtype { get; set; }

public: __property System.String get_Subtype();
public: __property void set_Subtype(
   System.String value
);

public:
property System.String Subtype {
   System.String get();
   void set(System.String value);
}

The value of this property must be a first-class name, as defined in PDF Reference Appendix E. Names without a registered prefix must conform to the MIME media type names defined in Internet RFC 2046, Multipurpose Internet Mail Extensions (MIME), Part Two: Media Types, with the provision that characters not allowed in names must use the 2-character hexadecimal code format.