Questão jurídica principal
Whether the public-law appeal could challenge the cantonal court's denial of standing/interested party status for a declaratory action
Decisão extraída
The challenge was inadmissible because the question concerned federal law and had to be raised by reform appeal, not public-law appeal.
Fundamentação extraída
The existence of an interest to sue in a declaratory action governed by federal substantive law is a federal-law question; due to subsidiarity, public-law review is excluded.