title: Show and hide elements for different exporters
body: <p>How can I show and hide specific elements in a Jasper Reports template (JRXML)
  according the export type,  for example </p>
  
  <pre><code>&lt;reportElement x="0" y="70" width="342" height="90"&gt;
      &lt;printWhenExpression&gt;
          &lt;![CDATA[$V{IS_PDF}]]&gt;
      &lt;/printWhenExpression&gt;
  &lt;/reportElement&gt;
  
  &lt;reportElement x="0" y="70" width="342" height="90"&gt;
      &lt;printWhenExpression&gt;
          &lt;![CDATA[$V{IS_XSL}]]&gt;
      &lt;/printWhenExpression&gt;
  &lt;/reportElement&gt;
  </code></pre>
  
  <p>I don't want to pass the IS_PDF, or IS_XSL within the report parameters, I am asking if there is a way within the template it's self to indicate the export type</p>