title: XSLT expression to check if variable belongs to set of elements
body: <p>I have code like this:</p>
  
  <pre><code>  &lt;xsl:if test="$k='7' or $k = '8' or $k = '9'"&gt;
  </code></pre>
  
  <p>Is there any way to put this expression in a form, like, for instance SQL</p>
  
  <pre><code>   k IN (7, 8, 9)
  </code></pre>
  
  <p>Ty :)</p>