diff -r 000000000000 -r 373ffda63c9a src/share/jaxws_classes/com/sun/tools/internal/xjc/model/SymbolSpace.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/jaxws_classes/com/sun/tools/internal/xjc/model/SymbolSpace.java	Wed Apr 27 01:27:09 2016 +0800
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 1997, 2011, 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.tools.internal.xjc.model;
+
+import com.sun.codemodel.internal.JCodeModel;
+import com.sun.codemodel.internal.JType;
+
+/**
+ * Symbol space for ID/IDREF.
+ *
+ * In XJC, the whole ID space is considered to be splitted into
+ * one or more "symbol space". For an IDREF to match an ID, we impose
+ * additional restriction to the one stated in the XML rec.
+ *
+ * <p>
+ * That is, XJC'll require that the IDREF belongs to the same symbol
+ * space as the ID. Having this concept allows us to assign more
+ * specific type to IDREF.
+ *
+ * <p>
+ * See the design document for detail.
+ *
+ * @author
+ *    <a href="mailto:kohsuke.kawaguchi@sun.com">Kohsuke KAWAGUCHI</a>
+ */
+public class SymbolSpace
+{
+    private JType type;
+    private final JCodeModel codeModel;
+
+    public SymbolSpace( JCodeModel _codeModel ) {
+        this.codeModel = _codeModel;
+    }
+
+    /**
+     * Gets the Java type of this symbol space.
+     *
+     * <p>
+     * A symbol space is said to have a Java type X if all classes
+     * pointed by IDs belonging to this symbol space are assignable
+     * to X.
+     */
+    public JType getType() {
+        if(type==null)  return codeModel.ref(Object.class);
+        return type;
+    }
+
+    public void setType( JType _type ) {
+        if( this.type==null )
+            this.type = _type;
+    }
+
+    public String toString() {
+        if(type==null)  return "undetermined";
+        else            return type.name();
+    }
+}