<?xml version=“1.0”?> <doc>

<parent>
  <discarded>discarded</discarded>
  <preserved/>
  This text node must be discarded
  <discarded>discarded</discarded>
  <preserved>
    content1
    <child1/>
    <child2>content2</child2>
    <preserved>too</preserved>
    <child2>content3</child2>
    <preserved/>
    <child2>content4</child2>
    <preserved/>
    <child2>content5</child2>
    content6
  </preserved>
  This text node must be discarded
  <discarded>discarded</discarded>
  This text node must be discarded
  <preserved/>
  This text node must be discarded
  <preserved/>
  This text node must be discarded
  <discarded>discarded</discarded>
  This text node must be discarded
</parent>

</doc>