protocol possibl court tribun efta state request court justic european commun decid interpret eea rule ec rule articl question interpret provis agreement ident substanc provis treati establish european commun amend supplement act adopt pursuanc thereof aris case pend court tribun efta state court tribun consid court justic european commun decid question articl efta state intend make protocol notifi depositari court justic european commun extent modal protocol appli court tribun articl depositari notifi contract parti notif articl