aName = nsnull; aPrefix = nsnull;
*aNameSpaceID = kNameSpaceID_None; *aName = nsnull; *aPrefix = nsnull;
  NS_IMETHOD GetAttrNameAt(PRInt32 aIndex,                           PRInt32& aNameSpaceID,                            nsIAtom*& aName,                           nsIAtom*& aPrefix) const    {      aName = nsnull;      aPrefix = nsnull;      return NS_ERROR_ILLEGAL_VALUE;    }