Custom sitemap runtime. Add new tag: changefreq, priority

sitemap_runtime_custom.php

<?
use Bitrix\Main\IO\File;
use Bitrix\Main\Text\Converter;
use Bitrix\Seo\SitemapRuntime;


class SitemapRuntimeCustom extends SitemapRuntime
{
    const ENTRY_TPL_NEW = '<url><loc>%s</loc><lastmod>%s</lastmod><changefreq>weekly</changefreq><priority>0.9</priority></url>';

    public function __construct($PID, $fileName, $arSettings)
    {
        parent::__construct($PID, $fileName, $arSettings);
    }

    public function addEntry($entry)
    {
        if($this->isSplitNeeded())
        {
            $this->split();
            $this->addEntry($entry);
        }
        else
        {
            if(!$this->partChanged)
            {
                $this->addHeader();
            }

            $this->putContents(
                sprintf(
                    self::ENTRY_TPL_NEW,
                    Converter::getXmlConverter()->encode($entry['XML_LOC']),
                    Converter::getXmlConverter()->encode($entry['XML_LASTMOD'])
                ), self::APPEND
            );
        }
    }

    public function addFileEntry(File $f)
    {
        if($f->isExists() && !$f->isSystem())
        {
            $this->addEntry(array(
                'XML_LOC' => $this->settings['PROTOCOL'].'://'.\CBXPunycode::toASCII($this->settings['DOMAIN'], $e = null).$this->getFileUrl($f),
                'XML_LASTMOD' => date('c', $f->getModificationTime()),
            ));
        }
    }
    public function addIBlockEntry($url, $modifiedDate)
    {
        $this->addEntry(array(
            'XML_LOC' => $this->settings['PROTOCOL'].'://'.\CBXPunycode::toASCII($this->settings['DOMAIN'], $e = null).$url,
            'XML_LASTMOD' => date('c', $modifiedDate - \CTimeZone::getOffset()),
        ));
    }
}

Добавляю к стандартному sitemap параметры: changefreq, priority