    # File lib/nokogiri/xml/node_set.rb, line 147
          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