Google changed their sitemap format

From this

<urlset xmlns='http://www.sitemaps.org/schemas/sitemap/0.9'>
<url>
URL
</url>
<lastmod>DATE</lastmod>
<changefreq>FREQ</changefreq>
</urlset>

To this


<?xml version="1.0" encoding="UTF-8"?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<sitemap>
<loc>URL</loc>
<lastmod>DATE</lastmod>
</sitemap>
</sitemapindex>