Fibered Manifolds, Natural Bundles, Structured Sets, G-Sets and all   that: The Hole Story from Space Time to Elementary Particles
  In this paper we review the hole argument for the space-time points and elementary particles and generalize the hole argument to include all geometric object fields and diffeomorphisms; and, by application of forgetful functors to abstract from differentiability and even continuity, the hole argument is applied to a much wider class of mathematical objects. We discuss the problem concerning the individuation of the objects in more general settings such that fibered manifolds, fibered sets and n-ary relations. 
J. Stachel, M. Iftime