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Google Sitemaps Gains Image Support
The Google Webmaster Central Blog announced that you can use a Sitemaps extension to provide image data to Google. In the Sitemaps file you can specify the following properties of the images; image, location, caption, geographic location, title and license details.
More technical specifications can be seen over here and here is a sample Google gives:
<?xml version="1.0" encoding="UTF-8"?>