Optional
Auto domains and categorical value order need the data. R-13.3 (round 21, 2026-08-05): optional, because a structural scene has no UGM. Resolvers fall back to explicit domains and overrides when it is absent.
Auto domains and categorical value order need the data. R-13.3 (round 21, 2026-08-05): optional, because a structural scene has no UGM. Resolvers fall back to explicit domains and overrides when it is absent.