title: Swagger predefined return type values from enum
body: <p>I need to be able to tell Swagger API documentation that a certain API will return a subset of certain enum.</p>
  
  <p>Imagine I have an enum UserType { User_Not_Found, User_Blocked, User_Duplicated, User_Active ...and so on }.</p>
  
  <p>One api/users/search might return the user FullName in case it finds a match or "User_Not_Found" in case it doesn't. </p>
  
  <pre><code>return Request.CreateResponse(
         success ? HttpStatusCode.OK : HttpStatusCode.BadRequest, 
         success ? fullName : UserType.User_Not_Found.ToString());
  </code></pre>
  
  <p>Question: how do I tell swagger that on this specific API the return might return either a fullname if match is found or a "User_Not_Found" if match is not found?</p>