[ Version ( since = "0.4.0" ) ]
public string relation_type { get; set; }
Specifies the relationship between the containing entity and the contained person.
For example: gdata_gd_who_event_performer or gdata_gd_who_event_attendee .
For more information, see the <ulink type="http" url="http://code.google.com/apis/gdata/docs/2.0/elements.html#gdWho">GData specification</ulink>.