Nationality — As Affected by Territorial Changes — Incorporation of Austria into German Reich — Acquisition of German Nationality by Austrian Citizens — Subsequent Severance of Austria from German Reich and Reconstitution of Austrian State — Re-Acquisition of Austrian Nationality by Former Austrian Citizens — Whether Re-Acquisition of Austrian Nationality Results in Loss of German Nationality — Relevance of Residence of Person at Date of Re-Acquisition of Austrian Nationality — The Law of Germany.