    # File lib/nokogiri/xml/node_set.rb, line 195
          def remove_class name = nil
            each do |el|
              if name
                classes = el['class'].to_s.split(/\s+/)
                if classes.empty?
                  el.delete 'class'
                else
                  el['class'] = (classes - [name]).uniq.join " "
                end
              else
                el.delete "class"
              end
            end
            self
          end