Changefreq.php

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<?php
#require_once 'Zend/Validate/Abstract.php';

class Zend_Validate_Sitemap_Changefreq extends Zend_Validate_Abstract
{
    const NOT_VALID = 'sitemapChangefreqNotValid';
    const INVALID   = 'sitemapChangefreqInvalid';

    protected $_messageTemplates = array(
        self::NOT_VALID => "'%value%' is not a valid sitemap changefreq",
        self::INVALID   => "Invalid type given. String expected",
    );

    protected $_changeFreqs = array(
        'always',  'hourly', 'daily', 'weekly',
        'monthly', 'yearly', 'never'
    );

    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;
    }
}