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diff --git a/src/share/classes/javax/xml/transform/stax/StAXSource.java b/src/share/classes/javax/xml/transform/stax/StAXSource.java
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+/*
+ * Copyright (c) 2005, 2006, 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 javax.xml.transform.stax;
+
+import javax.xml.stream.XMLEventReader;
+import javax.xml.stream.XMLStreamConstants;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.events.XMLEvent;
+import javax.xml.transform.Source;
+
+/**
+ * <p>Acts as a holder for an XML {@link Source} in the
+ * form of a StAX reader,i.e.
+ * {@link XMLStreamReader} or {@link XMLEventReader}.
+ * <code>StAXSource</code> can be used in all cases that accept
+ * a <code>Source</code>, e.g. {@link javax.xml.transform.Transformer},
+ * {@link javax.xml.validation.Validator} which accept
+ * <code>Source</code> as input.
+ *
+ * <p><code>StAXSource</code>s are consumed during processing
+ * and are not reusable.</p>
+ *
+ * @author <a href="mailto:Neeraj.Bajaj@Sun.com">Neeraj Bajaj</a>
+ * @author <a href="mailto:Jeff.Suttor@Sun.com">Jeff Suttor</a>
+ *
+ * @see <a href="http://jcp.org/en/jsr/detail?id=173">
+ *  JSR 173: Streaming API for XML</a>
+ * @see XMLStreamReader
+ * @see XMLEventReader
+ *
+ * @since 1.6
+ */
+public class StAXSource implements Source {
+
+    /** If {@link javax.xml.transform.TransformerFactory#getFeature(String name)}
+     * returns true when passed this value as an argument,
+     * the Transformer supports Source input of this type.
+     */
+    public static final String FEATURE =
+        "http://javax.xml.transform.stax.StAXSource/feature";
+
+    /** <p><code>XMLEventReader</code> to be used for source input.</p> */
+    private XMLEventReader xmlEventReader = null;
+
+    /** <p><code>XMLStreamReader</code> to be used for source input.</p> */
+    private XMLStreamReader xmlStreamReader = null;
+
+    /** <p>System identifier of source input.</p> */
+    private String systemId = null;
+
+    /**
+     * <p>Creates a new instance of a <code>StAXSource</code>
+     * by supplying an {@link XMLEventReader}.</p>
+     *
+     * <p><code>XMLEventReader</code> must be a
+     * non-<code>null</code> reference.</p>
+     *
+     * <p><code>XMLEventReader</code> must be in
+     * {@link XMLStreamConstants#START_DOCUMENT} or
+     * {@link XMLStreamConstants#START_ELEMENT} state.</p>
+     *
+     * @param xmlEventReader <code>XMLEventReader</code> used to create
+     *   this <code>StAXSource</code>.
+     *
+     * @throws XMLStreamException If <code>xmlEventReader</code> access
+     *   throws an <code>Exception</code>.
+     * @throws IllegalArgumentException If <code>xmlEventReader</code> ==
+     *   <code>null</code>.
+     * @throws IllegalStateException If <code>xmlEventReader</code>
+     *   is not in <code>XMLStreamConstants.START_DOCUMENT</code> or
+     *   <code>XMLStreamConstants.START_ELEMENT</code> state.
+     */
+    public StAXSource(final XMLEventReader xmlEventReader)
+        throws XMLStreamException {
+
+        if (xmlEventReader == null) {
+            throw new IllegalArgumentException(
+                    "StAXSource(XMLEventReader) with XMLEventReader == null");
+        }
+
+        // TODO: This is ugly ...
+        // there is no way to know the current position(event) of
+        // XMLEventReader.  peek() is the only way to know the next event.
+        // The next event on the input stream should be
+        // XMLStreamConstants.START_DOCUMENT or
+        // XMLStreamConstants.START_ELEMENT.
+        XMLEvent event = xmlEventReader.peek();
+        int eventType = event.getEventType();
+        if (eventType != XMLStreamConstants.START_DOCUMENT
+                && eventType != XMLStreamConstants.START_ELEMENT) {
+            throw new IllegalStateException(
+                "StAXSource(XMLEventReader) with XMLEventReader "
+                + "not in XMLStreamConstants.START_DOCUMENT or "
+                + "XMLStreamConstants.START_ELEMENT state");
+        }
+
+        this.xmlEventReader = xmlEventReader;
+        systemId = event.getLocation().getSystemId();
+    }
+
+    /**
+     * <p>Creates a new instance of a <code>StAXSource</code>
+     * by supplying an {@link XMLStreamReader}.</p>
+     *
+     * <p><code>XMLStreamReader</code> must be a
+     * non-<code>null</code> reference.</p>
+     *
+     * <p><code>XMLStreamReader</code> must be in
+     * {@link XMLStreamConstants#START_DOCUMENT} or
+     * {@link XMLStreamConstants#START_ELEMENT} state.</p>
+     *
+     * @param xmlStreamReader <code>XMLStreamReader</code> used to create
+     *   this <code>StAXSource</code>.
+     *
+     * @throws IllegalArgumentException If <code>xmlStreamReader</code> ==
+     *   <code>null</code>.
+     * @throws IllegalStateException If <code>xmlStreamReader</code>
+     *   is not in <code>XMLStreamConstants.START_DOCUMENT</code> or
+     *   <code>XMLStreamConstants.START_ELEMENT</code> state.
+     */
+    public StAXSource(final XMLStreamReader xmlStreamReader) {
+
+        if (xmlStreamReader == null) {
+            throw new IllegalArgumentException(
+                    "StAXSource(XMLStreamReader) with XMLStreamReader == null");
+        }
+
+        int eventType = xmlStreamReader.getEventType();
+        if (eventType != XMLStreamConstants.START_DOCUMENT
+                && eventType != XMLStreamConstants.START_ELEMENT) {
+            throw new IllegalStateException(
+                    "StAXSource(XMLStreamReader) with XMLStreamReader"
+                    + "not in XMLStreamConstants.START_DOCUMENT or "
+                    + "XMLStreamConstants.START_ELEMENT state");
+        }
+
+        this.xmlStreamReader = xmlStreamReader;
+        systemId = xmlStreamReader.getLocation().getSystemId();
+    }
+
+    /**
+     * <p>Get the <code>XMLEventReader</code> used by this
+     * <code>StAXSource</code>.</p>
+     *
+     * <p><code>XMLEventReader</code> will be <code>null</code>.
+     * if this <code>StAXSource</code> was created with a
+     * <code>XMLStreamReader</code>.</p>
+     *
+     * @return <code>XMLEventReader</code> used by this
+     *   <code>StAXSource</code>.
+     */
+    public XMLEventReader getXMLEventReader() {
+
+        return xmlEventReader;
+    }
+
+    /**
+     * <p>Get the <code>XMLStreamReader</code> used by this
+     * <code>StAXSource</code>.</p>
+     *
+     * <p><code>XMLStreamReader</code> will be <code>null</code>
+     * if this <code>StAXSource</code> was created with a
+     * <code>XMLEventReader</code>.</p>
+     *
+     * @return <code>XMLStreamReader</code> used by this
+     *   <code>StAXSource</code>.
+     */
+    public XMLStreamReader getXMLStreamReader() {
+
+        return xmlStreamReader;
+    }
+
+    /**
+     * <p>In the context of a <code>StAXSource</code>, it is not appropriate
+     * to explicitly set the system identifier.
+     * The <code>XMLStreamReader</code> or <code>XMLEventReader</code>
+     * used to construct this <code>StAXSource</code> determines the
+     * system identifier of the XML source.</p>
+     *
+     * <p>An {@link UnsupportedOperationException} is <strong>always</strong>
+     * thrown by this method.</p>
+     *
+     * @param systemId Ignored.
+     *
+     * @throws UnsupportedOperationException Is <strong>always</strong>
+     *   thrown by this method.
+     */
+    public void setSystemId(final String systemId) {
+
+        throw new UnsupportedOperationException(
+                "StAXSource#setSystemId(systemId) cannot set the "
+                + "system identifier for a StAXSource");
+    }
+
+    /**
+     * <p>Get the system identifier used by this
+     * <code>StAXSource</code>.</p>
+     *
+     * <p>The <code>XMLStreamReader</code> or <code>XMLEventReader</code>
+     * used to construct this <code>StAXSource</code> is queried to determine
+     * the system identifier of the XML source.</p>
+     *
+     * <p>The system identifier may be <code>null</code> or
+     * an empty <code>""</code> <code>String</code>.</p>
+     *
+     * @return System identifier used by this <code>StAXSource</code>.
+     */
+    public String getSystemId() {
+
+        return systemId;
+    }
+}