Not sure I follow you there. You're talking about the way other page links from your site appear in the SERPs? That doesn't have a direct correlation to a sitemap. I have sites with no sitemap file at all that get that treatment.
It's difficult to explain without providing a snapshot or direct link but I will try: If you search google.com on Google, the first result will give you a TABLE of 8 links (formatting not retained easily in this post):
Gmail Images Maps Webmaster Tools Google Mail Calendar Services and tools Shopping
If you search some other, lesser known doomains (including mine), you will receive full results, but not categorized neatly as the above.
How does Google determine whether to "index" the contents of a web site in the above described manner? Isn't that related to the XML sitemap that a webmaster submits?