Key legal question
Whether refusal to hear witnesses violated the right to be heard
Extracted holding
The complaint was not cognizable in constitutional proceedings because the alleged refusal concerned an issue that could have been raised as a violation of federal evidence law in an ordinary appeal.
Extracted reasoning
The cantonal court rejected the witnesses as unsuitable evidence; such a grievance, in a properly appealable dispute, had to be raised under Art. 8 ZGB rather than by constitutional complaint.