Code for multiple sitemaps:
<[sitemapindex](http://sitemaps.org/protocol.php#sitemapIndex_sitemapindex) xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<[sitemap](http://sitemaps.org/protocol.php#sitemapIndex_sitemap)>
<[loc](http://sitemaps.org/protocol.php#sitemapIndex_loc)>http://www.example.com/sitemap1.xml.gz
<[lastmod](http://sitemaps.org/protocol.php#sitemapIndex_lastmod)>2004-10-01T18:23:17+00:00
<[sitemap](http://sitemaps.org/protocol.php#sitemapIndex_sitemap)>
<[loc](http://sitemaps.org/protocol.php#sitemapIndex_loc)>http://www.example.com/sitemap2.xml.gz
<[lastmod](http://sitemaps.org/protocol.php#sitemapIndex_lastmod)>2005-01-01