title: css in xsl document
body: <p>how do i implement css in xsl file? i tried this: </p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt;
  &lt;link rel="stylesheet" type="text/css" href="dxsl.css"/&gt;
  &lt;xsl:output method="html" /&gt;
  </code></pre>
  
  <p>but it threw the error:</p>
  
  <pre><code>XSLTProcessor::importStylesheet(): Found a top-level element link with null namespace URI 
  </code></pre>
  
  <p>and</p>
  
  <pre><code>Warning: XSLTProcessor::transformToXml(): No stylesheet associated to this object 
  </code></pre>