aFragment.mFragmentIdentifier |= mFragmentIdentifierMask;
aFragment.mFragmentIdentifier = NS_REINTERPRET_CAST(void*, NS_REINTERPRET_CAST(PRUint32, aFragment.mFragmentIdentifier) | mFragmentIdentifierMask);
      SetRightStringInFragment( nsReadableFragment<CharT>& aFragment ) const        {          aFragment.mFragmentIdentifier |= mFragmentIdentifierMask;          return kRightString;        }