diff --git a/core/src/main/java/org/springframework/ws/transport/http/LastModifiedHelper.java b/core/src/main/java/org/springframework/ws/transport/http/LastModifiedHelper.java
new file mode 100644
index 00000000..7079cfb4
--- /dev/null
+++ b/core/src/main/java/org/springframework/ws/transport/http/LastModifiedHelper.java
@@ -0,0 +1,75 @@
+/*
+ * Copyright 2008 the original author or authors.
+ *
+ * Licensed 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.springframework.ws.transport.http;
+
+import java.io.File;
+import java.net.URI;
+import java.net.URISyntaxException;
+import javax.xml.transform.Source;
+import javax.xml.transform.dom.DOMSource;
+
+import org.w3c.dom.Document;
+
+import org.springframework.util.StringUtils;
+import org.springframework.xml.transform.TraxUtils;
+
+/**
+ * Utility class that determines the last modified date of a given {@link Source}.
+ *
+ * @author Arjen Poutsma
+ * @since 1.5.3
+ */
+class LastModifiedHelper {
+
+    private LastModifiedHelper() {
+    }
+
+    /**
+     * Returns the last modified date of the given {@link Source}.
+     *
+     * @param source the source
+     * @return the last modified date, as a long
+     */
+    static long getLastModified(Source source) {
+        if (source instanceof DOMSource) {
+            Document document = TraxUtils.getDocument((DOMSource) source);
+            return document != null ? getLastModified(document.getDocumentURI()) : -1;
+        }
+        else {
+            return getLastModified(source.getSystemId());
+        }
+    }
+
+    private static long getLastModified(String systemId) {
+        if (StringUtils.hasText(systemId)) {
+            try {
+                URI systemIdUri = new URI(systemId);
+                if ("file".equals(systemIdUri.getScheme())) {
+                    File documentFile = new File(systemIdUri);
+                    if (documentFile.exists()) {
+                        return documentFile.lastModified();
+                    }
+                }
+            }
+            catch (URISyntaxException e) {
+                // ignore
+            }
+        }
+        return -1;
+    }
+
+}
diff --git a/core/src/main/java/org/springframework/ws/transport/http/WsdlDefinitionHandlerAdapter.java b/core/src/main/java/org/springframework/ws/transport/http/WsdlDefinitionHandlerAdapter.java
index 3ae8f482..014c9b0d 100644
--- a/core/src/main/java/org/springframework/ws/transport/http/WsdlDefinitionHandlerAdapter.java
+++ b/core/src/main/java/org/springframework/ws/transport/http/WsdlDefinitionHandlerAdapter.java
@@ -109,7 +109,8 @@ public class WsdlDefinitionHandlerAdapter extends TransformerObjectSupport imple
     }
 
     public long getLastModified(HttpServletRequest request, Object handler) {
-        return -1;
+        Source definitionSource = ((WsdlDefinition) handler).getSource();
+        return LastModifiedHelper.getLastModified(definitionSource);
     }
 
     public ModelAndView handle(HttpServletRequest request, HttpServletResponse response, Object handler)
diff --git a/core/src/main/java/org/springframework/ws/transport/http/XsdSchemaHandlerAdapter.java b/core/src/main/java/org/springframework/ws/transport/http/XsdSchemaHandlerAdapter.java
index 4eac58d9..afb9cb9e 100644
--- a/core/src/main/java/org/springframework/ws/transport/http/XsdSchemaHandlerAdapter.java
+++ b/core/src/main/java/org/springframework/ws/transport/http/XsdSchemaHandlerAdapter.java
@@ -56,31 +56,7 @@ public class XsdSchemaHandlerAdapter extends TransformerObjectSupport implements
 
     public long getLastModified(HttpServletRequest request, Object handler) {
         Source schemaSource = ((XsdSchema) handler).getSource();
-        if (schemaSource instanceof DOMSource) {
-            Document document = TraxUtils.getDocument((DOMSource) schemaSource);
-            return document != null ? getLastModified(document.getDocumentURI()) : -1;
-        }
-        else {
-            return getLastModified(schemaSource.getSystemId());
-        }
-    }
-
-    private long getLastModified(String systemId) {
-        if (StringUtils.hasText(systemId)) {
-            try {
-                URI systemIdUri = new URI(systemId);
-                if ("file".equals(systemIdUri.getScheme())) {
-                    File documentFile = new File(systemIdUri);
-                    if (documentFile.exists()) {
-                        return documentFile.lastModified();
-                    }
-                }
-            }
-            catch (URISyntaxException e) {
-                // ignore
-            }
-        }
-        return -1;
+        return LastModifiedHelper.getLastModified(schemaSource);
     }
 
     public ModelAndView handle(HttpServletRequest request, HttpServletResponse response, Object handler)
diff --git a/core/src/test/java/org/springframework/ws/transport/http/LastModifiedHelperTest.java b/core/src/test/java/org/springframework/ws/transport/http/LastModifiedHelperTest.java
new file mode 100644
index 00000000..1812c8a8
--- /dev/null
+++ b/core/src/test/java/org/springframework/ws/transport/http/LastModifiedHelperTest.java
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2008 the original author or authors.
+ *
+ * Licensed 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.springframework.ws.transport.http;
+
+import java.util.Date;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.transform.dom.DOMSource;
+import javax.xml.transform.stream.StreamSource;
+
+import junit.framework.*;
+
+import org.springframework.ws.transport.http.LastModifiedHelper;
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.xml.transform.ResourceSource;
+
+import org.w3c.dom.Document;
+
+public class LastModifiedHelperTest extends TestCase {
+
+    private Resource resource;
+
+    private long expected;
+
+    protected void setUp() throws Exception {
+        resource = new ClassPathResource("single.xsd", getClass());
+        expected = resource.lastModified();
+    }
+
+    public void testSaxSource() throws Exception {
+        long result = LastModifiedHelper.getLastModified(new ResourceSource(resource));
+        assertEquals("Invalid last modified", expected, result);
+    }
+
+    public void testDomSource() throws Exception {
+        DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
+        documentBuilderFactory.setNamespaceAware(true);
+        DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
+        Document document = documentBuilder.parse(resource.getFile());
+        long result = LastModifiedHelper.getLastModified(new DOMSource(document));
+        assertEquals("Invalid last modified", expected, result);
+    }
+
+    public void testStreamSource() throws Exception {
+        long result = LastModifiedHelper.getLastModified(new StreamSource(resource.getFile()));
+        assertEquals("Invalid last modified", expected, result);
+    }
+}
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