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diff --git a/sandbox/sebastien/java/wrapped/unreleased/samples/implementation-sample-async/src/test/java/sample/Xutil.java b/sandbox/sebastien/java/wrapped/unreleased/samples/implementation-sample-async/src/test/java/sample/Xutil.java
new file mode 100644
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--- /dev/null
+++ b/sandbox/sebastien/java/wrapped/unreleased/samples/implementation-sample-async/src/test/java/sample/Xutil.java
@@ -0,0 +1,225 @@
+/*
+ * 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 java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+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;
+import org.w3c.dom.NodeList;
+
+/**
+ * Just for fun, a little bit of magic code and utility functions to help work with XML DOM.
+ */
+public class Xutil {
+    public interface NodeBuilder {
+        Node build(Document doc);
+    }
+
+    /**
+     * Convert a name and a list of children to a document element.
+     */
+    public static Element xdom(String ns, String name, final NodeBuilder... nodes) {
+        return (Element)elem(ns, name, nodes).build(db.newDocument());
+    }
+
+    /**
+     * Convert a name and children to an element.
+     */
+    public static NodeBuilder elem(final String uri, final String n, final NodeBuilder... nodes) {
+        return new NodeBuilder() {
+            public Node build(Document doc) {
+                final Element e = doc.createElementNS(uri, n);
+                for(final NodeBuilder n: nodes)
+                    e.appendChild(n.build(doc));
+                return e;
+            }
+        };
+    }
+
+    public static NodeBuilder elem(final String n, final NodeBuilder... nodes) {
+        return elem(null, n, nodes);
+    }
+
+    /**
+     * Convert a string to a text element.
+     */
+    public static NodeBuilder text(final String t) {
+        return new NodeBuilder() {
+            public Node build(final Document doc) {
+                return doc.createTextNode(t);
+            }
+        };
+    }
+
+    private final static DocumentBuilder db = db();
+
+    private static DocumentBuilder db() {
+        try {
+            return DocumentBuilderFactory.newInstance().newDocumentBuilder();
+        } catch(ParserConfigurationException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    /**
+     * Convert an element to XML.
+     */
+    static TransformerFactory trf = TransformerFactory.newInstance();
+
+    public 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();
+
+    public 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);
+        }
+    }
+
+    /**
+     * A pure Java FP-style alternative to xpath for DOM.
+     */
+    interface Mapper<T> {
+        T map(final Element e);
+    }
+    
+    static Mapper<Element> identity = new Mapper<Element>() {
+        public Element map(Element e) {
+            return e;
+        };
+    };
+    
+    interface Reducer<T> {
+        T reduce(final T accum, final Element e);
+    }
+    
+    public static Reducer<String> print = new Reducer<String>() {
+        public String reduce(String accum, Element e) {
+            return accum + e.getTextContent();
+        }
+    };
+
+    /**
+     * Apply a mapper to a list of elements.
+     */
+    public static <T> List<T> xmap(final Mapper<T> f, final Iterable<Element> l) {
+        final List<T> v = new ArrayList<T>();
+        for(Element e: l)
+            v.add(f.map(e));
+        return v;
+    }
+
+    /**
+     * Apply a filter to a list of elements.
+     */
+    public static List<Element> xfilter(final Mapper<Boolean> f, final Iterable<Element> l) {
+        final List<Element> v = new ArrayList<Element>();
+        for(Element e: l)
+            if(f.map(e))
+                v.add(e);
+        return v;
+    }
+
+    /**
+     * Perform a reduction over a list of elements.
+     */
+    public static <T> T xreduce(final Reducer<T> f, final T initial, final Iterable<Element> l) {
+        T accum = initial;
+        for(Element e: l)
+            accum = f.reduce(accum, e);
+        return accum;
+    }
+
+    /**
+     * Return a filter that selects elements by name.
+     */
+    public static Mapper<Boolean> select(final String name) {
+        return new Mapper<Boolean>() {
+            public Boolean map(Element e) {
+                return name.equals(e.getLocalName());
+            }
+        };
+    }
+
+    /**
+     * Return the child elements of a node.
+     */
+    public static Iterable<Element> elems(final Node parent) {
+        final List<Element> l = new ArrayList<Element>();
+        for (Node n: children(parent))
+            if (n instanceof Element)
+                l.add((Element)n);
+        return l;
+    }
+
+    /**
+     * An iterable over the children of a node.
+     */
+    private static Iterable<Node> children(Node parent) {
+        final NodeList l = parent.getChildNodes();
+        final int n = l.getLength();
+        return new Iterable<Node>() {
+            public Iterator<Node> iterator() {
+                return new Iterator<Node>() {
+                    int i = 0;
+                    public boolean hasNext() {
+                        return i < n;
+                    }
+                    public Node next() {
+                        return l.item(i++);
+                    }
+                    public void remove() {
+                    }
+                };
+            }  
+        };
+    }
+}