An example of Sitemap index referencing one separate sitemap follows. Sitemap files have a limit of 50,000 URLs and 50MB per sitemap. Multiple sitemap files are supported, with a Sitemap index file serving as an entry point. A Sitemap is an XML file that lists the URLs for a site. The Sitemap files contains URLs to these pages so that web crawlers can find them. The program generates its own XML sitemap for the websites. Nesting a sitemap index within a sitemap index is invalid according to Google. Now web developers submit a Sitemap directly, or wait for search engines to find it. A site map (or sitemap) is a list of pages of a web site. Google supports a Google News sitemap type for facilitating quick indexing of time-sensitive news subjects. Web pages and their navigation structure are managed in a dedicated sitemap editor. You can have more than one Sitemap index file. The front-page of the BNR offers a sitemap to get to all the subpages.