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diff --git a/gnu/xml/xpath/IdFunction.java b/gnu/xml/xpath/IdFunction.java
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+/* IdFunction.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.Collection;
+import java.util.List;
+import org.w3c.dom.Node;
+
+/**
+ * The <code>id</code> function selects elements by their unique ID.
+ * When the argument to id is of type node-set, then the result is
+ * the union of the result of applying id to the string-value of each of the
+ * nodes in the argument node-set. When the argument to id is of any other
+ * type, the argument is converted to a string as if by a call to the string
+ * function; the string is split into a whitespace-separated list of tokens
+ * (whitespace is any sequence of characters matching the production S); the
+ * result is a node-set containing the elements in the same document as the
+ * context node that have a unique ID equal to any of the tokens in the
+ * list.
+ *
+ * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
+ */
+public final class IdFunction
+  extends Pattern
+{
+
+  final Expr arg;
+
+  IdFunction(List args)
+  {
+    this((Expr) args.get(0));
+  }
+
+  public IdFunction(Expr arg)
+  {
+    this.arg = arg;
+  }
+
+  public boolean matches(Node context)
+  {
+    Object ret = evaluate(context, 1, 1);
+    return !((Collection) ret).isEmpty();
+  }
+
+  public Object evaluate(Node context, int pos, int len)
+  {
+    Object val = arg.evaluate(context, pos, len);
+    return _id(context, val);
+  }
+
+  public Expr clone(Object context)
+  {
+    return new IdFunction(arg.clone(context));
+  }
+
+  public String toString()
+  {
+    return "id(" + arg + ")";
+  }
+  
+}