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<link action="<qd><qd arg="(qd)ref3(/qd)">ref2</qd></qd>">[qd]ref[/qd]
+</link>

<link action="someaction">a link</link>

  <link action="<qd>ref3</qd>"><qd>ref</qd></link>

  <qd>ref3</qd>  ...  
     result ; <link action="someaction"><qd>ref</qd></link>
...

  <link  ... 
     result ; <a href="action.pl?action=someaction">a link</a>