Art. 5 of the Federal Act on Personal Capacity; admissibility of a federal appeal against a cantonal guardianship decision based on cantonal law. A filing styled as an appeal to the Federal Court is not a state-law recourse unless it alleges a breach of federal law. Where the cantonal judgment is founded exclusively on cantonal law, and the cited federal provision operates only as a constraint on cantonal lawmakers and courts rather than as a substantive decision norm, no federal appeal lies. The Federal Court will accordingly refuse to enter into the matter (consid. 1).