    <%--
     Licensed to the Apache Software Foundation (ASF) under one or more
      contributor license agreements.  See the NOTICE file distributed with
      this work for additional information regarding copyright ownership.
      The ASF licenses this file to You 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

      Unless required by applicable law or agreed to in writing, software
      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
      limitations under the License.
    --%>
    <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>

    <html>
      <head>
        <title>JSP 2.0 Expression Language - Implicit Objects</title>
      </head>
      <body>
        <h1>JSP 2.0 Expression Language - Implicit Objects</h1>
        <hr>
        This example illustrates some of the implicit objects available
        in the Expression Language.  The following implicit objects are
        available (not all illustrated here):
        <ul>
          <li>pageContext - the PageContext object</li>
          <li>pageScope - a Map that maps page-scoped attribute names to
              their values</li>
          <li>requestScope - a Map that maps request-scoped attribute names
              to their values</li>
          <li>sessionScope - a Map that maps session-scoped attribute names
              to their values</li>
          <li>applicationScope - a Map that maps application-scoped attribute
              names to their values</li>
          <li>param - a Map that maps parameter names to a single String
              parameter value</li>
          <li>paramValues - a Map that maps parameter names to a String[] of
              all values for that parameter</li>
          <li>header - a Map that maps header names to a single String
              header value</li>
          <li>headerValues - a Map that maps header names to a String[] of
              all values for that header</li>
          <li>initParam - a Map that maps context initialization parameter
              names to their String parameter value</li>
          <li>cookie - a Map that maps cookie names to a single Cookie object.</li>
        </ul>

        <blockquote>
          <u><b>Change Parameter</b></u>
          <form action="implicit-objects.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>\${param["foo"]}</td>
                <td>${fn:escapeXml(param["foo"])}&nbsp;</td>
              </tr>
              <tr>
                <td>\${header["host"]}</td>
                <td>${fn:escapeXml(header["host"])}&nbsp;</td>
              </tr>
              <tr>
                <td>\${header["accept"]}</td>
                <td>${fn:escapeXml(header["accept"])}&nbsp;</td>
              </tr>
              <tr>
                <td>\${header["user-agent"]}</td>
                <td>${fn:escapeXml(header["user-agent"])}&nbsp;</td>
              </tr>
            </table>
          </code>
        </blockquote>
      </body>
    </html>