diff -r 5b37998e522e -r 162c1de6545a web/lib/Zend/Validate/Sitemap/Changefreq.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/lib/Zend/Validate/Sitemap/Changefreq.php	Fri Mar 11 15:05:35 2011 +0100
@@ -0,0 +1,95 @@
+<?php
+/**
+ * Zend Framework
+ *
+ * LICENSE
+ *
+ * This source file is subject to the new BSD license that is bundled
+ * with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://framework.zend.com/license/new-bsd
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@zend.com so we can send you a copy immediately.
+ *
+ * @category   Zend
+ * @package    Zend_Validate
+ * @subpackage Sitemap
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ * @version    $Id: Changefreq.php 22668 2010-07-25 14:50:46Z thomas $
+ */
+
+/**
+ * @see Zend_Validate_Abstract
+ */
+require_once 'Zend/Validate/Abstract.php';
+
+/**
+ * Validates whether a given value is valid as a sitemap <changefreq> value
+ *
+ * @link       http://www.sitemaps.org/protocol.php Sitemaps XML format
+ *
+ * @category   Zend
+ * @package    Zend_Validate
+ * @subpackage Sitemap
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+class Zend_Validate_Sitemap_Changefreq extends Zend_Validate_Abstract
+{
+    /**
+     * Validation key for not valid
+     *
+     */
+    const NOT_VALID = 'sitemapChangefreqNotValid';
+    const INVALID   = 'sitemapChangefreqInvalid';
+
+    /**
+     * Validation failure message template definitions
+     *
+     * @var array
+     */
+    protected $_messageTemplates = array(
+        self::NOT_VALID => "'%value%' is no valid sitemap changefreq",
+        self::INVALID   => "Invalid type given. String expected",
+    );
+
+    /**
+     * Valid change frequencies
+     *
+     * @var array
+     */
+    protected $_changeFreqs = array(
+        'always',  'hourly', 'daily', 'weekly',
+        'monthly', 'yearly', 'never'
+    );
+
+    /**
+     * Validates if a string is valid as a sitemap changefreq
+     *
+     * @link http://www.sitemaps.org/protocol.php#changefreqdef <changefreq>
+     *
+     * @param  string  $value  value to validate
+     * @return boolean
+     */
+    public function isValid($value)
+    {
+        if (!is_string($value)) {
+            $this->_error(self::INVALID);
+            return false;
+        }
+
+        $this->_setValue($value);
+        if (!is_string($value)) {
+            return false;
+        }
+
+        if (!in_array($value, $this->_changeFreqs, true)) {
+            $this->_error(self::NOT_VALID);
+            return false;
+        }
+
+        return true;
+    }
+}