    <!--
      Copyright 2004 The Apache Software Foundation

      Licensed under the Apache License, Version 2.0 (the "License");
      you may not use this file except in compliance with the License.
      You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

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      distributed under the License is distributed on an "AS IS" BASIS,
      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      See the License for the specific language governing permissions and
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    -->
    <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
    <%@ taglib prefix="my" uri="http://jakarta.apache.org/tomcat/jsp2-example-taglib"%>

    <html>
      <head>
        <title>JSP 2.0 Expression Language - Functions</title>
      </head>
      <body>
        <h1>JSP 2.0 Expression Language - Functions</h1>
        <hr>
        An upgrade from the JSTL expression language, the JSP 2.0 EL also
        allows for simple function invocation.  Functions are defined
        by tag libraries and are implemented by a Java programmer as
        static methods.

        <blockquote>
          <u><b>Change Parameter</b></u>
          <form action="functions.jsp" method="GET">
    	  foo = <input type="text" name="foo" value="${fn:escapeXml(param["foo"])}">
              <input type="submit">
          </form>
          <br>
          <code>
            <table border="1">
              <thead>
    	    <td><b>EL Expression</b></td>
    	    <td><b>Result</b></td>
    	  </thead>
    	  <tr>
    	    <td>\${param["foo"]}</td>
    	    <td>${fn:escapeXml(param["foo"])}&nbsp;</td>
    	  </tr>
    	  <tr>
    	    <td>\${my:reverse(param["foo"])}</td>
    	    <td>${my:reverse(fn:escapeXml(param["foo"]))}&nbsp;</td>
    	  </tr>
    	  <tr>
    	    <td>\${my:reverse(my:reverse(param["foo"]))}</td>
    	    <td>${my:reverse(my:reverse(fn:escapeXml(param["foo"])))}&nbsp;</td>
    	  </tr>
    	  <tr>
    	    <td>\${my:countVowels(param["foo"])}</td>
    	    <td>${my:countVowels(fn:escapeXml(param["foo"]))}&nbsp;</td>
    	  </tr>
    	</table>
          </code>
        </blockquote>
      </body>
    </html>