Definition section_disp_data : UU := ∑ (Fob : forall x:C, D x), (forall (x y:C) (f:x --> y), Fob x -->[f] Fob y).
Require Import UniMath.Foundations.Sets. Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.DisplayedCats.Core.