# File lib/nokogiri/xml/node_set.rb, line 92
      def remove_class name = nil
        each do |el|
          next unless el.respond_to? :get_attribute
          if name
            classes = el.get_attribute('class').to_s.split(" ")
            el.set_attribute('class', (classes - [name]).uniq.join(" "))
          else
            el.remove_attribute("class")
          end
        end
        self
      end