diff -r 1d7e6da6adc8 -r c348e06f0e82 jaxp/src/javax/xml/xpath/XPathFunction.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jaxp/src/javax/xml/xpath/XPathFunction.java	Thu Apr 12 08:38:26 2012 -0700
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2003, 2005, 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.xpath;
+
+import java.util.List;
+
+/**
+ * <p><code>XPathFunction</code> provides access to XPath functions.</p>
+ *
+ * <p>Functions are identified by QName and arity in XPath.</p>
+ *
+ * @author  <a href="mailto:Norman.Walsh@Sun.com">Norman Walsh</a>
+ * @author  <a href="mailto:Jeff.Suttor@Sun.com">Jeff Suttor</a>
+ * @since 1.5
+ */
+public interface XPathFunction {
+  /**
+   * <p>Evaluate the function with the specified arguments.</p>
+   *
+   * <p>To the greatest extent possible, side-effects should be avoided in the
+   * definition of extension functions. The implementation evaluating an
+   * XPath expression is under no obligation to call extension functions in
+   * any particular order or any particular number of times.</p>
+   *
+   * @param args The arguments, <code>null</code> is a valid value.
+   *
+   * @return The result of evaluating the <code>XPath</code> function as an <code>Object</code>.
+   *
+   * @throws XPathFunctionException If <code>args</code> cannot be evaluated with this <code>XPath</code> function.
+   */
+  public Object evaluate(List args)
+    throws XPathFunctionException;
+}