# File lib/edi4r/edifact.rb, line 1518
    def to_s
      rt = self.root
      s = ''; skip_count = 0
      ce_sep = rt.una.ce_sep.chr
      each {|de| 
        if de.empty?
          skip_count += 1
        else
          if skip_count > 0
            s << ce_sep * skip_count
            skip_count = 0
          end
          s << de.to_s
          skip_count += 1
        end
      }
      s
    end