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diff --git a/libjava/gnu/xml/xpath/UnionExpr.java b/libjava/gnu/xml/xpath/UnionExpr.java
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+/* UnionExpr.java -- 
+   Copyright (C) 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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 for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.xml.xpath;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import org.w3c.dom.Node;
+
+/**
+ * The union of two node-sets.
+ *
+ * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
+ */
+public final class UnionExpr
+  extends Pattern
+{
+
+  final Expr lhs;
+  final Expr rhs;
+
+  public UnionExpr(Expr lhs, Expr rhs)
+  {
+    this.lhs = lhs;
+    this.rhs = rhs;
+  }
+
+  public boolean matches(Node context)
+  {
+    if (lhs instanceof Pattern && rhs instanceof Pattern)
+      {
+        return ((Pattern) lhs).matches(context) ||
+          ((Pattern) rhs).matches(context);
+      }
+    return false;
+  }
+
+  public Object evaluate(Node context, int pos, int len)
+  {
+    Object left = lhs.evaluate(context, pos, len);
+    Object right = rhs.evaluate(context, pos, len);
+    if (left instanceof Collection && right instanceof Collection)
+      {
+        Set set = new HashSet();
+        set.addAll ((Collection) left);
+        set.addAll ((Collection) right);
+        List list = new ArrayList(set);
+        Collections.sort(list, documentOrderComparator);
+        return list;
+      }
+    return Collections.EMPTY_SET;
+  }
+
+  public Expr clone(Object context)
+  {
+    return new UnionExpr(lhs.clone(context), rhs.clone(context));
+  }
+
+  public String toString()
+  {
+    return lhs + " | " + rhs;
+  }
+  
+}