Let's put on a scenario for a Job Classified site,
So far the way we are handling xml sitemaps is in a consecutive number containing only ads historically:
http://site.com/sitemap_ads_1.xml
http://site.com/sitemap_ads_2.xml
http://site.com/sitemap_ads_99.xml
Those sitemaps are constantly updating as each ad is published, keeping expired ads but I'm sure there is a better way to handle them.
For instance we have other source of content besides ads pages, like those related to search results (Careers, Location, Salary, level, type of contract, etc) and blog content, but we are not adding them yet
So what I'm suggesting is to reduce the amount of xml sitemaps ads to just one, including just the ones that are active (not expired), add another xml sitemap based on search results, another one on blog content, another one on images and finally one for static content such as home, faq, contact, etc.
Do you guys think this is the right way to go?