However, for their own purposes schools can also use temporary local attendance codes which are only converted to the statutory codes during those annual data collections.
Fodd bynnag, at eu dibenion eu hunain gall ysgolion hefyd ddefnyddio codau presenoldeb lleol dros dro sydd ond yn cael eu trosi i'r codau statudol yn ystod y casgliadau data blynyddol hynny.