Hello, My friend is running a directory. So when new request come to link exchange, he dynamically creates new sitemap with same name as Google asks - sitemap.xml Very first time he has submitted 300 URL sitemap and most of them crawled by Google. Now you think, that, if sitemap is having more then 300 URL, 1 - Do we have to resubmit site map in Google every time or Google will take automatically new updated sitemap? 2 - Does Google crawl only new added URL in sitemap or it will crawl all the URL's in the sitemap? Need a Good reply so I can suggest related person.
Google automatically updates the sitemap.. and it crawles each and every url mentioned in sitemap file...
Thats fine that it will take URL from the sitemap. But if you see the second question is not answered. Suppose, web master tool has taken 500 URLs from total 500 URL. Now suppose I add new 100 URL. So what it will do? It will crawl all 500 + 100 = 600 URL each time or it will take only new 100 URL.