Kernrechtsfrage
Whether the Federal Court could review the Aargau appellate court's order to take evidence on alleged prorogation facts.
Extrahierter Entscheid
The order was only an evidentiary decree and did not yet finally decide jurisdiction or compel the defendant to appear before the cantonal courts; therefore no basis for federal review existed at this stage.
Extrahierte Begründung
A mere order to prove disputed facts relevant to jurisdiction is not itself a decision asserting judicial competence. The constitutional complaint was premature because the defendant was not yet subject to an enforceable jurisdictional ruling.