2 files changed, 20 insertions, 0 deletions
diff --git a/lib/rites/rite_of/rite_of.ml b/lib/rites/rite_of/rite_of.ml
index 9eeb5ef..f45bf50 100644
--- a/lib/rites/rite_of/rite_of.ml
+++ b/lib/rites/rite_of/rite_of.ml
@@ -80,6 +80,19 @@ let context ~lectionary : (Vocab_of.season, Vocab_of.rank) Rite.t =
     season_runs = Vocab_of.[ Advent; Christmas; Ordinary_time; Lent; Easter; Ordinary_time ];
     transfer_target = Precedence_of.transfer_target;
     readings = Lectionary_of.readings ~lectionary ~year_start:Temporal_of.year_start;
+    (* Two well-formed shapes, not EF's one -- OLM 1981 Praenotanda n. 66.1
+       ("Quaelibet Missa tres exhibet lectiones": Sunday/solemnity Mass,
+       First from the OT, Second "ex Apostolo", Gospel) against n. 69.1
+       ("Quaelibet Missa duas exhibet lectiones": ferial Mass, First and
+       Gospel only), both page-image verified,
+       docs/research/of/olm-1981.pdf pp.32-33/"XXXII-XXXIII"; n. 84(b)/(c),
+       pp.37-38/"XXXVII-XXXVIII", extends the three-reading shape to every
+       solemnity of a particular calendar and confines feasts/memorials to
+       two. {!Rite.t.citation_shapes}'s own doc comment has the fuller
+       argument for why this is a rite-supplied field rather than a kernel
+       constant. *)
+    citation_shapes =
+      [ [ Citation.First; Citation.Gospel ]; [ Citation.First; Citation.Second; Citation.Gospel ] ];
     creed = Rubrics_of.creed;
     gloria = Rubrics_of.gloria;
     preface = Rubrics_of.preface }
diff --git a/lib/rites/rite_of/rite_of.mli b/lib/rites/rite_of/rite_of.mli
index eeb38d5..8124467 100644
--- a/lib/rites/rite_of/rite_of.mli
+++ b/lib/rites/rite_of/rite_of.mli
@@ -43,6 +43,13 @@ module Lectionary_of = Lectionary_of
       reading-cycle arithmetic's own Advent anchor) -- no [~commons]
       parameter, unlike EF: the OF lectionary chain has no Commons
       indirection to thread through.
+    - [citation_shapes]: TWO well-formed shapes, not EF's one --
+      [[First; Gospel]] on a feria, feast or memorial, and
+      [[First; Second; Gospel]] on a Sunday or solemnity (OLM 1981
+      Praenotanda n. 66.1/n. 69.1, n. 84(b)/(c)) -- see this file's own
+      [context] for the full citation and
+      {!Colitur_kernel.Rite.t.citation_shapes}'s own doc comment for why
+      this field is rite-supplied at all.
     - [creed], [gloria], [preface]: {!Rubrics_of}, IGMR n. 53/67-68/364-365.
 
     [~lectionary] is a caller-supplied parameter, not a value closed over an