element bib {
    fs:item-sequence-to-node-sequence(
      for $b in
        fs:distinct-docorder-or-atomic-sequence(
          let $fs:sequence :=
            fs:node-sequence(
              fs:distinct-docorder-or-atomic-sequence(
                let $fs:sequence :=
                  fs:node-sequence(
                    let $fs:v1 :=
                      fs:promote-to-anystring(
                        fs:convert-simple-operand(fn:data("bib.xml"), "")
                      )
                    return doc($fs:v1)
                  ),
                    $fs:last := fn:count($fs:sequence)
                for $fs:dot at $fs:position in $fs:sequence
                return child::bib
              )
            ),
              $fs:last := fn:count($fs:sequence)
          for $fs:dot at $fs:position in $fs:sequence
          return child::book
        )
      order by
        fn:data(
          fs:distinct-docorder-or-atomic-sequence(
            let $fs:sequence := fs:node-sequence($b),
                $fs:last := fn:count($fs:sequence)
            for $fs:dot at $fs:position in $fs:sequence
            return attribute::year
          )
        ) descending empty greatest
      return
        element book {
          fs:item-sequence-to-node-sequence(
            attribute newyear {
              fn:data(text {""}),
               fn:data(
                 fs:item-sequence-to-untypedAtomic(
                   fs:distinct-docorder-or-atomic-sequence(
                     let $fs:sequence := fs:node-sequence($b),
                         $fs:last := fn:count($fs:sequence)
                     for $fs:dot at $fs:position in $fs:sequence
                     return attribute::year
                   )
                 )
               )
            },
            fs:distinct-docorder-or-atomic-sequence(
              let $fs:sequence := fs:node-sequence($b),
                  $fs:last := fn:count($fs:sequence)
              for $fs:dot at $fs:position in $fs:sequence
              return child::title
            )
          )
        }
    )
  }