++++ 1 . SOCIAL POLICY - COMMON VOCATIONAL TRAINING POLICY - VOCATIONAL TRAINING - MEANING OF TERM - UNIVERSITY STUDIES IN VETERINARY MEDICINE - INCLUDED ( EEC TREATY, ART . 128 ) 2 . COMMUNITY LAW - PRINCIPLES - EQUAL TREATMENT - DISCRIMINATION ON GROUNDS OF NATIONALITY - UNIVERSITY STUDIES IN A MEMBER STATE PREPARING FOR A QUALIFICATION FOR AN OCCUPATION - ENROLMENT FEE OR "MINERVAL" PAYABLE ONLY BY NATIONALS OF OTHER MEMBER STATES - PROHIBITION - PRELIMINARY RULING - INTERPRETATION NOT APPLICABLE TO APPLICATIONS FOR ADMISSION TO UNIVERSITY PRIOR TO DELIVERY OF JUDGMENT ( EEC TREATY, ARTS 7 AND 177 ) 3 . REFERENCES FOR A PRELIMINARY RULING - INTERPRETATION - EFFECT RATIONE TEMPORIS OF JUDGMENTS INTERPRETING COMMUNITY LAW - RETROACTIVE EFFECT - LIMITS - LEGAL CERTAINTY - DISCRETION OF THE COURT ( EEC TREATY, ART . 177 )