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diff --git a/lib/querypath/src/QueryPath/Extension/QPXSL.php b/lib/querypath/src/QueryPath/Extension/QPXSL.php
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+++ b/lib/querypath/src/QueryPath/Extension/QPXSL.php
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+<?php
+/** @file
+ * Provide QueryPath with XSLT support using the PHP libxslt module.
+ *
+ * This is called 'QPXSL' instead of 'QPXSLT' in accordance with the name
+ * of the PHP extension that provides libxslt support.
+ *
+ * You must have PHP XSL support for this to function.
+ *
+ * @author M Butcher <matt@aleph-null.tv>
+ * @license MIT
+ * @see QueryPath::Extension
+ * @see QueryPath::ExtensionRegistry::extend()
+ * @see QPXSL
+ * @see QPXML
+ */
+
+namespace QueryPath\Extension;
+
+/**
+ * Provide tools for running XSL Transformation (XSLT) on a document.
+ *
+ * This extension provides the {@link QPXSL::xslt()} function, which transforms
+ * a source XML document into another XML document according to the rules in
+ * an XSLT document.
+ *
+ * This QueryPath extension can be used as follows:
+ * <code>
+ * <?php
+ * require 'QueryPath/QueryPath.php';
+ * require 'QueryPath/Extension/QPXSL.php';
+ *
+ * qp('src.xml')->xslt('stylesheet.xml')->writeXML();
+ * ?>
+ *
+ * This will transform src.xml according to the XSLT rules in
+ * stylesheet.xml. The results are returned as a QueryPath object, which
+ * is written to XML using {@link QueryPath::writeXML()}.
+ * </code>
+ *
+ * @ingroup querypath_extensions
+ */
+class QPXSL implements \QueryPath\Extension {
+
+  protected $src = NULL;
+
+  public function __construct(\QueryPath\Query $qp) {
+    $this->src = $qp;
+  }
+
+  /**
+   * Given an XSLT stylesheet, run a transformation.
+   *
+   * This will attempt to read the provided stylesheet and then
+   * execute it on the current source document.
+   *
+   * @param mixed $style
+   *  This takes a QueryPath object or <em>any</em> of the types that the
+   *  {@link qp()} function can take.
+   * @return QueryPath
+   *  A QueryPath object wrapping the transformed document. Note that this is a
+   *  <i>different</em> document than the original. As such, it has no history.
+   *  You cannot call {@link QueryPath::end()} to undo a transformation. (However,
+   *  the original source document will remain unchanged.)
+   */
+  public function xslt($style) {
+    if (!($style instanceof QueryPath)) {
+      $style = \QueryPath::with($style);
+    }
+    $sourceDoc = $this->src->top()->get(0)->ownerDocument;
+    $styleDoc = $style->get(0)->ownerDocument;
+    $processor = new \XSLTProcessor();
+    $processor->importStylesheet($styleDoc);
+    return \QueryPath::with($processor->transformToDoc($sourceDoc));
+  }
+}