?????????

REFERENCING
{
{ OLD | NEW } [ ROW ] [ AS ] correlation-Name [ { OLD | NEW } [ ROW ] [ AS ] correlation-Name ] | 
{ OLD TABLE | NEW TABLE } [ AS ] Identifier [ { OLD TABLE | NEW TABLE } [AS] Identifier ]  |
{ OLD_TABLE | NEW_TABLE } [ AS ] Identifier [ { OLD_TABLE | NEW_TABLE } [AS] Identifier ] 
}