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$result = $qd->{$data};

action.pl?action=test&a=b&b=c&c=42

listing of /actions/test/body.aXML 
...

<qd><qd><qd>a</qd></qd></qd>

0: <qd><qd><qd>a</qd></qd></qd>

1: <qd><qd>b</qd></qd>

2 : <qd>c</qd>

  <qd><qd><qd>a</qd></qd></qd>

 
listing of "/plugins/sayhello.aXMLpi"
...
  
 $result = "hello $data monks";

<sayhello>perl</sayhello>

  <sayhello>java</sayhello>

if our query data contains a key value pair 'who' => 'PERL'
and we include into the document;

  <sayhello><qd>who</qd></sayhello>