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diff --git a/sandbox/sebastien/java/extend/samples/implementation-extension/src/test/java/sample/Xutil.java b/sandbox/sebastien/java/extend/samples/implementation-extension/src/test/java/sample/Xutil.java
new file mode 100644
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+++ b/sandbox/sebastien/java/extend/samples/implementation-extension/src/test/java/sample/Xutil.java
@@ -0,0 +1,142 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package sample;
+
+import java.io.StringWriter;
+
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.dom.DOMSource;
+import javax.xml.transform.stream.StreamResult;
+import javax.xml.xpath.XPath;
+import javax.xml.xpath.XPathConstants;
+import javax.xml.xpath.XPathExpressionException;
+import javax.xml.xpath.XPathFactory;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.Node;
+
+/**
+ * A little bit of magic code and utility functions to help work with DOM.
+ */
+class Xutil {
+    static class NodeBuilder {
+        String ns;
+        String name;
+        NodeBuilder[] children;
+        String text;
+    }
+
+    /**
+     * Convert a name and a list of children to a document element.
+     */
+    static Element dom(String ns, String name, final NodeBuilder... nodes) {
+        return (Element)node(elem(ns, name, nodes), db.newDocument());
+    }
+
+    /**
+     * Convert a name and children to an element.
+     */
+    static NodeBuilder elem(final String uri, final String n, final NodeBuilder... nodes) {
+        return new NodeBuilder() {
+            {
+                this.ns = uri;
+                this.name = n;
+                this.children = nodes;
+            }
+        };
+    }
+
+    static NodeBuilder elem(final String n, final NodeBuilder... nodes) {
+        return new NodeBuilder() {
+            {
+                this.name = n;
+                this.children = nodes;
+            }
+        };
+    }
+
+    /**
+     * Convert a string to a text element.
+     */
+    static NodeBuilder text(final String t) {
+        return new NodeBuilder() {
+            {
+                this.text = t;
+            }
+        };
+    }
+
+    private final static DocumentBuilder db = db();
+
+    private static DocumentBuilder db() {
+        try {
+            return DocumentBuilderFactory.newInstance().newDocumentBuilder();
+        } catch(ParserConfigurationException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private static Element link(final Element e, final Document doc, final NodeBuilder... nodes) {
+        for(final NodeBuilder c: nodes)
+            e.appendChild(node(c, doc));
+        return e;
+    }
+
+    private static Node node(NodeBuilder node, Document doc) {
+        if(node.text != null)
+            return doc.createTextNode(node.text);
+        return link(doc.createElementNS(node.ns, node.name), doc, node.children);
+    }
+
+    /**
+     * Convert an element to XML.
+     */
+    static TransformerFactory trf = TransformerFactory.newInstance();
+
+    static String xml(final Node node) {
+        try {
+            final StreamResult r = new StreamResult(new StringWriter());
+            trf.newTransformer().transform(new DOMSource(node), r);
+            return r.getWriter().toString();
+        } catch(TransformerException e) {
+            throw new RuntimeException(e);
+        }
+    }
+    
+    /**
+     * Evaluate an xpath expression.
+     */
+    private static XPathFactory xpf = XPathFactory.newInstance();
+
+    static String xpath(final String expr, final Node node) {
+        final XPath xp = xpf.newXPath();
+        try {
+            return (String)xp.evaluate(expr, node, XPathConstants.STRING);
+        } catch(XPathExpressionException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+}