If in a site XML sitemap is already exit now after so many on-pae changes need to resubmit it or not?
Hey, you can check the indexed and submitted XML plages on the search engines. By doing this, you can check out whether the submitted page has already been indexed or not!
XML site map are for search engine.XML site maps are very important for the web-browser for ranking the web-pages because search engine used to get the pages form the XML sitemap. It allows webmaster to add the additional information of the URL. Search engine crawls the site with the sitemap. If it has been already submitted then you should check the sitemap on the Google, if it's proper then no need to submit it again.
XML site map is used to submit for search engines, because they don’t know how much information having in our site and updating pages are their so if you submit to search engines it will easily grab our information