title: XSLT Relative path from absolute path
body: <p>How do I extract the path to the root folder of a given file?</p>
  
  <p>I have the expression</p>
  
  <pre><code>path/to/one/of/my/file.xml
  </code></pre>
  
  <p>I must get</p>
  
  <pre><code>../../../../../
  </code></pre>
  
  <p>using XSLT/XPath ?</p>