{ { { UNTIL TIME | FROM TIME } [=] 'date_string'
  | { TIME BETWEEN 'date_string' AND
    | FROM TIME [=] 'date_string' UNTIL TIME [=]
    } 
    'date_string' 
  | UNTIL SCN [=] integer 
  | SCN BETWEEN integer AND integer 
  | FROM SCN [=] integer [UNTIL SCN [=] integer]
  }
  [THREAD [=] integer]
| { UNTIL SEQUENCE [=] integer
  | FROM SEQUENCE [=] integer [UNTIL SEQUENCE [=] integer] 
  | SEQUENCE [BETWEEN integer AND] integer
  }
  [THREAD [=] integer]
}