public interface AnInterfaceOperations
{
  ... AnOperation (...) throws ...;
}

public interface AnInterface extends AnInterfaceOperations ... { }

abstract public class AnInterfaceHelper
{
  public static void insert (Any a, AnInterface t) {...}
  public static AnInterface extract (Any a) {...}
  public static AnInterface read (InputStream is) {...}
  public static void write (OutputStream os, AnInterface val) {...}
  ...

  public static AnInterface narrow (org.omg.CORBA.Object obj) {...}
  public static AnInterface narrow (java.lang.Object obj) {...}
}

final public class AnInterfaceHolder implements Streamable
{
  public AnInterface value;
  public AnInterfaceHolder () { }
  public AnInterfaceHolder (AnInterface initial) {...}

  ...
}