Kernrechtsfrage
Whether Zurich had jurisdiction under Art. 5 No. 1 LugÜ based on the place of performance.
Extrahierter Entscheid
No jurisdiction was shown because no contractual place of performance in Switzerland was proven and the relevant obligation was to be performed in Germany under the applicable law.
Extrahierte Begründung
The place of performance is determined by the law applicable to the contractual obligation, not autonomously under LugÜ. The alleged agreement on a Swiss performance place was not established on the facts binding on appeal.