Disputes — Arbitration — Procedure — Competence — Iran-United States Claims Settlement Declaration — Forum selection clause — Contracts containing provisions for settlement of disputes by Iranian courts — Cases arising therefrom outside the jurisdiction of the Iran — United States Claims Tribunal — Interpretation — Choice of law clauses — Implied choice of forum — Choice of arbitration not equivalent to choice of Iranian courts — Enforceability of forum selection clauses — Whether Tribunal entitled to consider enforceability — The law and practice of the Iran-United States Claims Tribunal