tag_start

# File lib/rss/parser.rb, line 299
    def tag_start(name, attributes)
      @text_stack.push('')

      ns = @ns_stack.last.dup
      attrs = {}
      attributes.each do |n, v|
        if /\Axmlns(?:\z|:)/ =~ n
          ns[$POSTMATCH] = v
        else
          attrs[n] = v
        end
      end
      @ns_stack.push(ns)

      prefix, local = split_name(name)
      @tag_stack.last.push([_ns(ns, prefix), local])
      @tag_stack.push([])
      if @xml_child_mode
        previous = @last_xml_element
        element_attrs = attributes.dup
        unless previous
          ns.each do |ns_prefix, value|
            next if ns_prefix == "xml"
            key = ns_prefix.empty? ? "xmlns" : "xmlns:#{ns_prefix}"
            element_attrs[key] ||= value
          end
        end
        next_element = XML::Element.new(local,
                                        prefix.empty? ? nil : prefix,
                                        _ns(ns, prefix),
                                        element_attrs)
        previous << next_element if previous
        @last_xml_element = next_element
        pr = Proc.new do |text, tags|
          if previous
            @last_xml_element = previous
          else
            @xml_element = @last_xml_element
            @last_xml_element = nil
          end
        end
        @proc_stack.push(pr)
      else
        if @rss.nil? and respond_to?("initial_start_#{local}", true)
          __send__("initial_start_#{local}", local, prefix, attrs, ns.dup)
        elsif respond_to?("start_#{local}", true)
          __send__("start_#{local}", local, prefix, attrs, ns.dup)
        else
          start_else_element(local, prefix, attrs, ns.dup)
        end
      end
    end