Procedure — Competence — icsid arbitration — Whether competence of tribunal excludes jurisdiction of municipal courts to enforce a prior arbitration award

Recognition and enforcement — Attachment proceedings — icsid Convention, Article 26 — “Other remedy” — Definition — Whether attachment proceedings constitute “other remedy” — Whether submission to icsid arbitration excludes recourse to municipal courts for enforcement of prior arbitral award

Treaties — Interpretation — Powers of municipal courts — The law of Belgium