# File lib/pdf/writer/object/outlines.rb, line 22
22:   def to_s
23:     if @list.empty?
24:       "\n#{@oid} 0 obj\n<< /Type /Outlines >>\nendobj"
25:     else
26:       "\n#{@oid} 0 obj\n<< /Type /Outlines /First #{@list[0].oid} 0 R /Last
27:       #{@list[-1].oid} 0 R>>\nendobj"
28:     end
29:   end