NS_IMETHOD AppendChildTo(nsIContent* aKid, PRBool aNotify) { return NS_OK;  }
NS_IMETHOD AppendChildTo(nsIContent* aKid, PRBool aNotify, PRBool aDeepSetDocument) { return NS_OK;  }
  NS_IMETHOD AppendChildTo(nsIContent* aKid, PRBool aNotify) { return NS_OK;  }