/usr/lib/ruby/vendor_ruby/nokogiri/xml/pp.rb is in ruby-nokogiri 1.6.8.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | require 'nokogiri/xml/pp/node'
require 'nokogiri/xml/pp/character_data'
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