gistfile1.rb

      def xml_equal?(*args)
        return nil if args.empty?
        docs = args.map do |xml|
          Nokogiri.XML(xml) { |config| config.strict }
        end
        signatures = docs.map do |doc|
          Lorax::Signature.new(doc.root).signature
        end
        signatures.uniq.length == 1
      end