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