++++ 1 . PRIVILEGES AND IMMUNITIES - ECSC PROTOCOL - SINGLE PROTOCOL FOR THE THREE COMMUNITIES - PRELIMINARY RULING ON INTERPRETATION - IDENTICAL OBJECTIVE ( PROTOCOL ON THE PRIVILEGES AND IMMUNITIES OF THE ECSC, ARTICLE 16; PROTOCOL ON THE PRIVILEGES AND IMMUNITIES OF THE COMMUNITIES, ARTICLE 30; EEC TREATY, ARTICLE 177; EAEC TREATY, ARTICLE 150 ) 2 . AMENDMENT OF LEGISLATION - SILENCE OF THE LEGISLATURE - CONTINUITY OF LEGAL SYSTEM - PRINCIPLE COMMON TO THE LEGAL SYSTEMS OF MEMBER STATES 3 . OFFICIALS OF THE ECSC - PRIVILEGES AND IMMUNITIES - EXEMPTION FROM NATIONAL TAXES - EXTENT ( PROTOCOL ON THE PRIVILEGES AND IMMUNITIES OF THE ECSC, ARTICLE 11 ) 4 . OFFICIALS OF THE ECSC - PRIVILEGES AND IMMUNITIES - EXEMPTION FROM NATIONAL TAXES - CONTRIBUTION INTENDED TO FINANCE A SOCIAL SECURITY SCHEME - NO EXEMPTION ( PROTOCOL ON THE PRIVILEGES AND IMMUNITIES OF THE ECSC, ARTICLE 11 )