1 <root>
   2      t
   3 t   
   4     <child1/>
   5     t
   6     <child2/>
   7     <child3/>
   8     <child4/>
   9     <child5>
  10         t
  11         <child51>
  12             <child511>t</child511>
  13         </child51>
  14         t
  15     </child5>
  16     <!-- test comment -->
  17     <!-- -->
  18     <?target1 test?>
  19 </root>