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Google SiteMap requirements.

Requirements

Points not yet covered (should we)?

• A Sitemap file can contain no more than 50,000 URLs and must be no larger than 50MB when uncompressed. If your Sitemap is larger than this, break it into several smaller Sitemaps. These limits help ensure that your web server is not overloaded by serving large files to Google.
• If you have more than one Sitemap, you can list them in a Sitemap index file and then submit the Sitemap index file to Google. You don't need to submit each Sitemap file individually.
• As well as basic URL information, Sitemaps can contain detailed information about specific types of content on your site, including video, images, mobile, News, and software source code

SiteMap XML

Display Site and VirtualUri mappings in a xml format.
Sites to be displayed are defined in the configuration (see configuration section). If no sites are defined, the root of the website repository will be taken to display sites. 

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