# File lib/asciidoctor/section.rb, line 154
  def sectnum(delimiter = '.', append = nil)
    append ||= (append == false ? '' : delimiter)
    if !@level.nil? && @level > 1 && @parent.is_a?(Section)
      "#{@parent.sectnum(delimiter)}#{@index + 1}#{append}"
    else
      "#{@index + 1}#{append}"
    end
  end