I don't think it matters, but put it this way: it wouldn't hurt.
If I was you, I would just create one, name it whatever, and submit it to all the main search engines.
You can also direct the search bots towards it using robots.txt
Again, check out the protocol: http://www.sitemaps.org/protocol.html#submit_robots
i am creating that sitemap.xml dynamically using php oops...but the size of the file exceed more than 10mb...we can upload sitemap with only 10mb...
Okay, I see.
Originally Posted by anji
u said there is no need of sitemap if i use robots.txt right??
Not quite. You can add an entry to robots.txt which would advise search bots of the location of your sitemap index.
This means you can call it what you want and store it in a different location than your site root.
hey i have one more doubt regarding about uploading....present i have 4 sitemaps.. i divided sitemap into 2 parts and those are put into one main sitemap(totally 3 sitemaps)..because this is dynamically creating sitemap.xml file thats y iam dividing into 2 parts...and another sitemap i used for dispalying what are the urls avalible in mysite...
i dont knw which one upload into google for crawling and indexing my site...can i upload 4 sitemaps into google