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(.using
 [library
  [lux (.except)
   [abstract
    [equivalence (.only Equivalence)]
    [monad (.only do)]]
   [control
    ["<>" parser (.only)
     ["<[0]>" xml (.only Parser)]]]
   [data
    ["[0]" text
     ["<[1]>" \\parser]]
    ["[0]" product]
    [format
     ["[0]" xml (.only XML)]]]]]
 ["[0]" //
  ["[1][0]" time (.only Time)]
  ["[1][0]" build (.only Build)]])

(type: .public Stamp
  (Record
   [#time Time
    #build Build]))

(def: .public equivalence
  (Equivalence Stamp)
  (all product.equivalence
       //time.equivalence
       //build.equivalence
       ))

(def: <timestamp>
  xml.Tag
  ["" "timestamp"])

(def: time_format
  (-> Time XML)
  (|>> //time.format
       {xml.#Text}
       list
       {xml.#Node ..<timestamp> xml.attributes}))

(def: .public (format (open "_[0]"))
  (-> Stamp (List XML))
  (list (..time_format _#time)
        (//build.format _#build)))

(def: time_parser
  (Parser Time)
  (<| (<xml>.node <timestamp>)
      (<text>.then //time.parser)
      <xml>.text))

(def: .public parser
  (Parser Stamp)
  (<>.and (<xml>.somewhere ..time_parser)
          (<xml>.somewhere //build.parser)))