Judgment of the Court (Sixth Chamber) of 5 February 2004 in Case C-18/02 (Reference for a preliminary ruling from the Arbejdsret ): Danmarks Rederiforening v LO Landsorganisationen i Sverige (Brussels Convention — Article 5(3) — Jurisdiction in matters relating to tort, delict or quasi-delict — Place where the harmful event occurred — Measure taken by a trade union in a Contracting State against the owner of a ship registered in another Contracting State)