A Complete Course of the Raku programming language(course.raku.org)

    def format({:ok, %HTTPoison.Response{body: body, status_code: 200}}) do
      body
      |> Meeseeks.parse(:xml)
      |> Meeseeks.all(xpath("/*"))
      |> Enum.map(&Meeseeks.tree/1)
      |> _format
    end

    defp _format([{"current_observation", _version, current_observation}]) do
      current_observation
      |> Enum.map(&_format/1)
      |> Enum.filter(& &1)
      |> Enum.into(Map.new())
      |> Poison.encode!()
    end

    defp _format({"credit", _, [credit]}) do
      {:credit, credit}
    end

    defp _format({"credit_URL", _, [credit_url]}) do
      {:credit_url, credit_url}
    end