Hi, just wanted to say thanks for such a great library.

One need we have is to generate a sitemap for a site that has more than 50,000 URLs. The search engines typically only handle a maximum of50,000 URLs per sitemap file, which means today that we manually create a sitemap index and move the URLs into individual sitemap files, each containing less than 50,000 URLs each.

One option I was considering was adding a feature topython-sitemap that would optionally output a sitemap index and multiple sitemap files if there are more than 50,000 URLs; would that be of interest? Just wanted to make sure that kind of feature would be desired prior to implementing; thanks!