The engines regularly update the sitemap format to better take into account the resources of a site. Last November, Google News format was changing, today Google announces an evolution to better take into account images …In a site template, many images are used without that they are relevant for image search engines, thanks to the new format, you will be able to indicate the important images to index for each of your pages thanks to the tag .

Concretely this is what your sitemap should look like:

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http://example.com/sample.html

 

http://example.com/image.jpg

 

This evolution has two main uses:

For more information on this evolution of the sitemap, you can go here.