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(.module:
  [library
   [lux "*"
    [abstract
     [equivalence {"+" Equivalence}]
     [monad {"+" do}]]
    [control
     ["<>" parser
      ["<[0]>" xml {"+" Parser}]
      ["<[0]>" text]]]
    [data
     [text
      ["%" format]]
     [format
      ["[0]" xml {"+" XML}]]]
    [math
     [number
      ["[0]" nat]]]]])

(type: .public Build
  Nat)

(def: .public equivalence
  (Equivalence Build)
  nat.equivalence)

(def: tag
  xml.Tag
  ["" "buildNumber"])

(def: .public format
  (-> Build XML)
  (|>> %.nat
       {xml.#Text}
       list
       {xml.#Node ..tag xml.attributes}))

(def: .public parser
  (Parser Build)
  (<| (<xml>.node ..tag)
      (<text>.then (<>.codec nat.decimal (<text>.many <text>.decimal)))
      <xml>.text))