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    <p>You need to pass in the extension using XsltArgumentList.</p> <p>As an example:</p> <pre><code>Dim xmlPath As String : xmlPath = sArgs(0) Dim xsltPath As String : xsltPath = sArgs(1) Dim dllFileName As String : dllFileName = sArgs(2) Dim xsltReader As XmlTextReader = New XmlTextReader(xsltPath) Dim xsltDoc As XslCompiledTransform = New XslCompiledTransform() xsltDoc.Load(xsltReader, New XsltSettings(), New XmlUrlResolver()) Dim xslArg As XsltArgumentList = New XsltArgumentList() Dim dll As Assembly = Assembly.LoadFrom(dllFileName) For Each objType As Type In dll.GetTypes() If objType.IsPublic Then Dim ext As Object = Activator.CreateInstance(objType) xslArg.AddExtensionObject("urn:" &amp; dllFileName &amp; "#" &amp; objType.Name, ext) End If Next Dim xpathDoc As XPathDocument = New XPathDocument(New XmlTextReader(xmlPath)) Dim outWriter As XmlWriter = XmlWriter.Create(Console.Out) xsltDoc.Transform(xpathDoc, xslArg, outWriter) outWriter.Flush() outWriter.Close() </code></pre> <p>My extension is in XsltExtensions.dll, within which I have:</p> <pre><code>Public Class Simple Public Function DateFormat(ByVal dateToParse As String, ByVal format As String) As String DateFormat = DateTime.Parse(dateToParse).ToString(format) End Function End Class </code></pre> <p>So putting it all together:</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" xmlns:my="urn:XsltExtensions.dll#Simple" exclude-result-prefixes="my"&gt; &lt;xsl:template match="/"&gt; &lt;root&gt; &lt;xsl:value-of select="my:DateFormat('3/9/2002', 'yyyy-MM-dd')"/&gt; &lt;/root&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre>
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