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(.module:
  [library
   [lux (#- Type)
    [abstract
     [equivalence (#+ Equivalence)]
     [monad (#+ do)]]
    [control
     ["<>" parser
      ["<.>" xml (#+ Parser)]
      ["<.>" text]]]
    [data
     ["." product]
     ["." text]
     [format
      ["." xml (#+ XML)]]]]]
  ["." /// #_
   ["#." type (#+ Type)]
   ["#." time (#+ Time)]])

(type: .public Version
  (Record
   {#extension Type
    #value Text
    #updated Time}))

(def: .public equivalence
  (Equivalence Version)
  ($_ product.equivalence
      text.equivalence
      text.equivalence
      ///time.equivalence
      ))

(template [<definition> <tag>]
  [(def: <definition> xml.Tag ["" <tag>])]

  [<extension> "extension"]
  [<value> "value"]
  [<updated> "updated"]

  [<snapshot_version> "snapshotVersion"]
  )

(def: (text_format tag value)
  (-> xml.Tag Text XML)
  (|> value #xml.Text list (#xml.Node tag xml.attributes)))

(def: .public (format (^slots [#extension #value #updated]))
  (-> Version XML)
  (<| (#xml.Node ..<snapshot_version> xml.attributes)
      (list (..text_format ..<extension> extension)
            (..text_format ..<value> value)
            (..text_format ..<updated> (///time.format updated)))))

(def: (text tag)
  (-> xml.Tag (Parser Text))
  (<| (<xml>.node tag)
      <xml>.text))

(def: .public parser
  (Parser Version)
  (<| (<xml>.node ..<snapshot_version>)
      ($_ <>.and
          (<xml>.somewhere (..text ..<extension>))
          (<xml>.somewhere (..text ..<value>))
          (<xml>.somewhere (<text>.then ///time.parser
                                        (..text ..<updated>)))
          )))