Index: core/servicemix-core/src/main/java/org/apache/servicemix/expression/JAXPXPathXStreamExpression.java
===================================================================
--- core/servicemix-core/src/main/java/org/apache/servicemix/expression/JAXPXPathXStreamExpression.java	(revision 0)
+++ core/servicemix-core/src/main/java/org/apache/servicemix/expression/JAXPXPathXStreamExpression.java	(revision 0)
@@ -0,0 +1,103 @@
+/*
+ * 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 org.apache.servicemix.expression;
+
+import javax.jbi.messaging.MessageExchange;
+import javax.jbi.messaging.MessagingException;
+import javax.jbi.messaging.NormalizedMessage;
+import javax.xml.xpath.XPathConstants;
+import javax.xml.xpath.XPathExpressionException;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.Node;
+
+import com.thoughtworks.xstream.XStream;
+import com.thoughtworks.xstream.io.HierarchicalStreamReader;
+import com.thoughtworks.xstream.io.xml.DomReader;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.impl.Log4JLogger;
+
+
+/**
+ *
+ * @author Andrew Skiba <skibaa@gmail.com>
+ */
+public class JAXPXPathXStreamExpression extends JAXPXPathExpression {
+
+    protected Log logger = new Log4JLogger(JAXPXPathXStreamExpression.class.getName());
+    private XStream xStream;
+
+    public JAXPXPathXStreamExpression() {
+        super();
+    }
+
+    /**
+     * A helper constructor to make a fully created expression.
+     * @param xpath 
+     */
+    public JAXPXPathXStreamExpression(String xpath) {
+        super(xpath);
+    }
+
+
+    @Override
+    public Object evaluate(MessageExchange exchange, NormalizedMessage message) throws MessagingException {
+        Node node = (Node) super.evaluate(exchange, message);
+        HierarchicalStreamReader streamReader;
+        if (node instanceof Document) {
+            streamReader = new DomReader((Document) node);
+        } else if (node instanceof Element) {
+            streamReader = new DomReader((Element) node);
+        } else {
+            throw new IllegalArgumentException("DOMResult contains neither Document nor Element");
+        }
+        return getXStream().unmarshal(streamReader);
+    }
+
+    public XStream getXStream() {
+        if (xStream == null) {
+            xStream = createXStream();
+        }
+        return xStream;
+    }
+
+    public void setXStream(XStream xStream) {
+        this.xStream = xStream;
+    }
+
+    //FIXME: copied as-is from XStreamMarshaler
+    private XStream createXStream() {
+        XStream answer = new XStream();
+        try {
+            answer.alias("invoke", Class.forName("org.logicblaze.lingo.LingoInvocation"));
+        } catch (ClassNotFoundException e) {
+            // Ignore
+        }
+        return answer;
+    }
+    
+    @Override
+    public Object evaluateXPath(Object object) throws XPathExpressionException {
+        Object res = getXPathExpression().evaluate(object, XPathConstants.NODE);
+        if (logger.isTraceEnabled()) {
+            logger.trace("JAXPXPathXStreamExpression.evaluateXPath(" + object + ") = " + res);
+        }
+        return res;
+        
+    }
+}