<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<sitemap>
<loc>https://preventiematerialen.nl/sitemap_nl.xml</loc>
...</sitemap>
<sitemap>
<loc>https://preventiematerialen.nl/sitemap_pl.xml</loc>
...</sitemap>
...</sitemapindex>