Extradition — Of nationals — Declaration by the Netherlands pursuant to the European Convention on Extradition, 1957, Article 6(b) — Declaration containing undertaking not to grant extradition requests in respect of “nationals” — Definition of nationals as including “foreigners integrated into the Dutch community” — Determination as to whether a particular individual is such a foreigner — Whether a matter for Executive or courts

Treaties — Application by municipal courts — Declaration made pursuant to treaty provisions — Declaration not incorporated into municipal law — Whether declaration may be enforced by municipal courts — The law of the Netherlands