NS_IMETHOD GetAttribute(PRInt32 aNameSpaceID, nsIAtom *aAttribute, nsIAtom*& aPrefix, nsString &aResult) const {return NS_CONTENT_ATTR_NOT_THERE; }
NS_IMETHOD GetAttribute(PRInt32 aNameSpaceID, nsIAtom *aAttribute, nsIAtom*& aPrefix, nsAWritableString& aResult) const {return NS_CONTENT_ATTR_NOT_THERE; }
  NS_IMETHOD GetAttribute(PRInt32 aNameSpaceID, nsIAtom *aAttribute, nsIAtom*& aPrefix, nsString &aResult) const {return NS_CONTENT_ATTR_NOT_THERE; }