Judgment of the Court of 4 July 2000 in Case C-424/97 (reference for a preliminary ruling from the Landgericht Düsseldorf): Salomone Haim v Kassenzahnärztliche Vereinigung Nordrhein (Member State liability in the event of a breach of Community law — Breaches attributable to a public-law body of a Member State — Conditions for the liability of the Member State and of a public-law body of that State — Compatibility of a language requirement with freedom of establishment)