I have situation where I need to call ‘A’ Sitemap in Sitemap ‘B’ .
This is required as I have lot of configuration in sitemap A but my Main Sitemap is B.
I do not want to maintain the sitemap A elements code at two different places .
nice feature to reduce the size of long running sitemaps & will facilitate multiple css ( I like blue my wife Pink & My son Yellow ) & can have more than one sitemap without duplicating the sitemap elements .
Looking out for this option in coming release .