*aListName = nsnull; switch (aIndex) { case NS_TABLE_FRAME_COLGROUP_LIST_INDEX: *aListName = nsLayoutAtoms::colGroupList; NS_ADDREF(*aListName); break; } return NS_OK;
return nsnull;
nsTableFrame::GetAdditionalChildListName(PRInt32   aIndex,                                         nsIAtom** aListName) const{  NS_PRECONDITION(nsnull != aListName, "null OUT parameter pointer");  if (aIndex < 0) {    return NS_ERROR_INVALID_ARG;  }  *aListName = nsnull;  switch (aIndex) {  case NS_TABLE_FRAME_COLGROUP_LIST_INDEX:    *aListName = nsLayoutAtoms::colGroupList;    NS_ADDREF(*aListName);    break;  }  return NS_OK;}