Inside Google Sitemaps: Using Sitemap Index Files
Your source for product news and developments
Several of you have asked us, Should I submit Sitemaps or Sitemap indexes for my site?
If you have a small site, you probably don't need to use a Sitemap index file -- you can just list all of your URLs in one Sitemap.
If you have a larger site, you may want or need to have multiple Sitemaps for your site. In that case, you can make submitting and tracking easier by listing the Sitemaps in a Sitemap index file.
You must use multiple Sitemaps for your site when:
You can also have an index of Sitemap index files. A Sitemap index file can be a maximum of 10MB as well, so if you have a really large site, you may have to use this additional organization step to keep the file sizes to a manageable level. We have a size limitation for Sitemaps and Sitemap indexes so that when we download the files, we don't overwhelm your bandwidth.
Compressing your Sitemap index file
Speaking of being considerate of your bandwidth, if you can, you should compress your Sitemaps and your Sitemap indexes using gzip. If you're not familiar with gzip, keep watching this blog. We're putting together some helpful instructions.
If you compress your Sitemap index file, you'll probably want to give it an .xml.gz extension. If you don't compress your Sitemap index file, you'll probably want to give it an .xml extension.
Submitting your Sitemap index file
So, you've got some individual Sitemaps that you've listed in a Sitemap index file. What now? Just Sign into Google Sitemaps and submit the Sitemap index file. You don't need to submit individual Sitemaps that are included in the index. Once we've processed your Sitemap index file, we'll let you know if we found errors in the Sitemap index itself, or in any of the individual Sitemaps.
If you make changes to a Sitemap included in a Sitemap index file you've submitted, just change the lastmod date for that Sitemap in your index. During this beta period, feel free to resubmit the Sitemap index file.
Copyright © 2005 Google Inc. All rights reserved.