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diff --git a/lib/kernel/liturgical_day.mli b/lib/kernel/liturgical_day.mli
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+(** The single stable result schema (parent spec §2). *)
+type ('s, 'r) t = {
+  date : Date.t;
+  rite : string;
+  temporal : ('s, 'r) Temporal.t;
+      (** embedded, not flattened: it is already a coherent unit with its own
+          invariants, and re-listing season/week/weekday here would create two
+          places for them to disagree *)
+  observed : 'r Celebration.t;
+  commemorations : ('r Celebration.t * Precedence.privilege) list;
+  transferred_in : 'r Celebration.t option;
+      (** arrived here from an impeded day *)
+  transferred_out : Date.t option;
+      (** this day's celebration went there *)
+  citations : Citation.t list;  (** always empty until Plan 4 *)
+}
+[@@deriving sexp]