Judgment of the Court (Sixth Chamber) of 16 December 1999 in Case C-101/98 (reference for a preliminary ruling from the Bundesgerichtshof): Union Deutsche Lebensmittelwerke GmbH v Schutzverband gegen Unwesen in der Wirtschaft eV (Protection of designations used in marketing of milk and milk products — Regulation (EEC) No 1898/87 — Directive 89/398/EEC — Use of the designation cheese to describe a dietary product in which the natural fat has been replaced by vegetable fat)