diff -r 000000000000 -r 373ffda63c9a src/share/jaxws_classes/com/sun/xml/internal/ws/api/model/wsdl/WSDLExtensible.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/jaxws_classes/com/sun/xml/internal/ws/api/model/wsdl/WSDLExtensible.java	Wed Apr 27 01:27:09 2016 +0800
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package com.sun.xml.internal.ws.api.model.wsdl;
+
+import java.util.List;
+
+import javax.xml.namespace.QName;
+
+import org.xml.sax.Locator;
+
+/**
+ * Interface that represents WSDL concepts that
+ * can have extensions.
+ *
+ * @author Vivek Pandey
+ * @author Kohsuke Kawaguchi
+ */
+public interface WSDLExtensible extends WSDLObject {
+    /**
+     * Gets all the {@link WSDLExtension}s
+     * added through {@link #addExtension(WSDLExtension)}.
+     *
+     * @return
+     *      never null.
+     */
+    Iterable<WSDLExtension> getExtensions();
+
+    /**
+     * Gets all the extensions that is assignable to the given type.
+     *
+     * <p>
+     * This allows clients to find specific extensions in a type-safe
+     * and convenient way.
+     *
+     * @param type
+     *      The type of the extension to obtain. Must not be null.
+     *
+     * @return
+     *      Can be an empty fromjava.collection but never null.
+     */
+    <T extends WSDLExtension> Iterable<T> getExtensions(Class<T> type);
+
+    /**
+     * Gets the extension that is assignable to the given type.
+     *
+     * <p>
+     * This is just a convenient version that does
+     *
+     * <pre>
+     * Iterator itr = getExtensions(type);
+     * if(itr.hasNext())  return itr.next();
+     * else               return null;
+     * </pre>
+     *
+     * @return
+     *      null if the extension was not found.
+     */
+    <T extends WSDLExtension> T getExtension(Class<T> type);
+
+    /**
+     * Adds a new {@link WSDLExtension}
+     * to this object.
+     *
+     * @param extension
+     *      must not be null.
+     */
+    void addExtension(WSDLExtension extension);
+
+    /**
+     * True if all required WSDL extensions on Port and Binding are understood
+     * @return true if all wsdl required extensions on Port and Binding are understood
+     */
+    public boolean areRequiredExtensionsUnderstood();
+
+    /**
+     * Marks extension as not understood
+     * @param extnEl QName of extension
+     * @param locator Locator
+     */
+    public void addNotUnderstoodExtension(QName extnEl, Locator locator);
+
+    /**
+     * Lists extensions marked as not understood
+     * @return List of not understood extensions
+     */
+    public List<? extends WSDLExtension> getNotUnderstoodExtensions();
+}