Kernrechtsfrage
Whether the public-law appeal against the Basel domicile/taxation decisions was timely.
Extrahierter Entscheid
The appeal was late because the Basel assujettissement decision and the subsequent tax assessments were not challenged within the statutory time limits.
Extrahierte Begründung
The taxpayer let the Basel assujettissement decision enter into force and did not appeal either cantonal assessment; by remaining inactive despite knowing of the intercantonal conflict, she implicitly accepted both cantons' taxing powers.