gistfile1.rb

Open3.pipeline_r(
  %W[xmllint --xinclude --xmlout #{spine_file}],
  # In order to clean up extraneous namespace declarations we need a second
  # xmllint process
  %W[xmllint --format --nsclean --xmlout -]) do |output, wait_thr|
  open(codex_file, 'w') do |f|
    IO.copy_stream(output, f)
  end
end