# File lib/maruku/toc.rb, line 61
    def numerate(a = [])
      self.section_number = a
      self.section_children.each_with_index {|c, i| c.numerate(a + [i + 1])}
      if h = self.header_element
        h.attributes[:section_number] = self.section_number
      end
    end