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

(type: #export Build
  Nat)

(def: #export equivalence
  (Equivalence Build)
  nat.equivalence)

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

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

(def: #export parser
  (Parser Build)
  (do <>.monad
    [_ (<xml>.node ..tag)]
    (<text>.embed (<>.codec nat.decimal
                            (<text>.many <text>.decimal))
                  (<xml>.children <xml>.text))))