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

(type: .public Origin
  (#Local Path)
  (#Remote URL))

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