Google have announced that they will start recgonising images within XML sitemaps which have been submitted for your website. The change will allow owners of image heavy websites to ensure Google is indexing these files for inclusion in image based search results.
For each URL on your sitemap you can list up to 1,000 images and include information on:
- The URL of each image
- A caption of the image
- The geographic location of the image
- Image title
- A URL to the licence of the image
Google’s webmaster help page provides more information on how to implement the image tags, but I have also included a short example below.