1 . TAX PROVISIONS - HARMONIZATION OF LAWS - TURNOVER TAX - COMMON SYSTEM OF VALUE-ADDED TAX - EXEMPTIONS PROVIDED FOR BY THE SIXTH DIRECTIVE - EXEMPTION FOR THE SUPPLY OF BUILDINGS AND THE LAND ON WHICH THEY STAND - SERVICES PROVIDED IN CONNECTION THEREWITH - WHETHER TAXABLE ( COUNCIL DIRECTIVE NO 77/388 , ART . 2 ( 1 ), ART . 13 B ( G ) AND ART . 28 ( 3 ) ( B )) 2 . TAX PROVISIONS - HARMONIZATION OF LAWS - TURNOVER TAX - COMMON SYSTEM OF VALUE-ADDED TAX - IMPOSITION OF OTHER NATIONAL TAXES ON TRANSACTIONS ALREADY SUBJECT TO VAT - WHETHER PERMISSIBLE - CONDITIONS ( COUNCIL DIRECTIVE NO 77/388 , ART . 33 )