setup_next_element

# File lib/rss/parser.rb, line 510
    def setup_next_element(tag_name, klass, attributes)
      previous = @last_element
      next_element = klass.new(@do_validate, attributes)
      previous.set_next_element(tag_name, next_element)
      @last_element = next_element
      @last_element.parent = previous if klass.need_parent?
      @xml_child_mode = @last_element.have_xml_content?

      Proc.new do |text, tags|
        p(@last_element.class) if DEBUG
        if @xml_child_mode
          @last_element.content = @xml_element.to_s
          xml_setter = @last_element.class.xml_setter
          @last_element.__send__(xml_setter, @xml_element)
          @xml_element = nil
          @xml_child_mode = false
        else
          if klass.have_content?
            if @last_element.need_base64_encode?
              text = text.lstrip.unpack("m").first
            end
            @last_element.content = text
          end
        end
        if @do_validate
          @last_element.validate_for_stream(tags, @ignore_unknown_element)
        end
        @last_element = previous
      end
    end