I have been searching around using Google but I can\'t find an answer to this question.
A robots.txt file can contain the following line:
Sitemap: http:/
It is possible to write them, but it is up to the search engine to know what to do with it. I suspect many search engines will either "keep digesting" more and more tokens, or alternatively, take the last sitemap they find as the real one.
I propose that the question be "if I want ____ search engine to index my site, would I be able to define multiple sitemaps?"