title: How does one do a null check for a Guid in xslt?
body: <p>I am trying to edit an xslt file.
  One line reads:</p>
  
  <pre><code>&lt;xsl:if test="number(./@LatestAuthor) &amp;gt; 0"&gt;
  </code></pre>
  
  <p>The issue I have is that latest author used to be of type int and is now a nullable Guid.  How can I edit the xslt file to check if @LatestAuthor is not null? Thanks.</p>