(.module:
  [lux #*
   [abstract
    [equivalence (#+ Equivalence)]]
   [data
    ["." sum]
    ["." text]]
   [world
    [file (#+ Path)]
    [net (#+ URL)]]])

(type: #export Origin
  (#Local Path)
  (#Remote URL))

(def: #export equivalence
  (Equivalence Origin)
  ($_ sum.equivalence
      text.equivalence
      text.equivalence
      ))