tag

# File lib/rss/rss.rb, line 978
    def tag(indent, additional_attrs={}, &block)
      next_indent = indent + INDENT

      attrs = collect_attrs
      return "" if attrs.nil?

      return "" unless have_required_elements?

      attrs.update(additional_attrs)
      start_tag = make_start_tag(indent, next_indent, attrs.dup)

      if block
        content = block.call(next_indent)
      else
        content = []
      end

      if content.is_a?(String)
        content = [content]
        start_tag << ">"
        end_tag = "</#{full_name}>"
      else
        content = content.reject{|x| x.empty?}
        if content.empty?
          return "" if attrs.empty?
          end_tag = "/>"
        else
          start_tag << ">\n"
          end_tag = "\n#{indent}</#{full_name}>"
        end
      end
      
      start_tag + content.join("\n") + end_tag
    end