An Update on Google Sitemaps

1. Google and the other search engines which are a part of Sitemaps.org now support up to 50,000 child Sitemaps for Sitemap index files (instead of the previous 1,000). This allows large sites to submit a theoretical maximum of 2.5 billion URLs with a single Sitemap Index URL (oh, and if you need more, you can always submit multiple Sitemap index files).
2. The Webmaster Tools design update now shows you all Sitemap files that were submitted for your verified website. This is particularly useful if you have multiple owners verified in Webmaster Tools or if you are submitting some Sitemap files via HTTP ping or through your robots.txt file.
3. The indexed URL count in Webmaster Tools for your Sitemap files is now even more precise.
4. For the XML developers out there, we’ve updated the XSD schemas to allow Sitemap extensions. The new schema helps webmasters to create better Sitemaps by verifying more features. By validating Sitemap files with the new schema, you can be more confident that the Sitemap files are correct.
5. Do I need to mention that Sitemap file processing is much faster than ever before? We’ve drastically reduced the average time from submitting a Sitemap file to processing it and showing some initial data in Webmaster Tools.