title: Is there a reference for the SharePoint XSLT extension functions?
body: <p>There are a couple of different .NET XSLT functions that I see used in the out of the box SharePoint web parts (RSS Viewer and Data View web part).</p>
  
  <pre><code>&lt;xsl:stylesheet
      xmlns:ddwrt="http://schemas.microsoft.com/WebParts/v2/DataView/runtime"  
      xmlns:rssaggwrt="http://schemas.microsoft.com/WebParts/v3/rssagg/runtime"
      ...&gt;
      ...
      &lt;xsl:value-of select="rssaggwrt:MakeSafe($Html)"/&gt;  
      &lt;a href="{ddwrt:EnsureAllowedProtocol(string(link))}"&gt;More...&lt;/a&gt;
      ...
  &lt;/xsl:stylesheet&gt;
  </code></pre>
  
  <p>Where can I find a reference that describes all of the extension functions that SharePoint provides?</p>