Questione giuridica chiave
Whether the appeal by B.________ was admissible although he had not participated in the cantonal proceedings.
Decisione estratta
No. Only parties who participated in the cantonal proceedings, or should have done so, may appeal; that condition was not shown for B.________.
Motivazione estratta
The federal court held that B.________ lacked standing because he did not establish participation in the cantonal case.