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  <link action="<qd>action</qd>">a hyperlink</link>

  <case c="<qd>whichfile</qd>">
    <file1>
...
      <insertfile>file2.xml</insertfile>
    </file2>
  </case>

  (case c="(qd)whichfile(/qd)")
    <file1><insertfile>....
...

  <insertfile><qd>whichfile</qd>.xml</insertfile>