(.using
 [library
  [lux (.full)
   [abstract
    [equivalence (.only Equivalence)]
    [monad (.only do)]]
   [control
    ["<>" parser
     ["<[0]>" xml (.only Parser)]
     ["<[0]>" text]]]
   [data
    [text
     ["%" format]]
    [format
     ["[0]" xml (.only 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))