Try Online Sitemap Generator to create sitemap.xml file. This works I know because I have submitted large sites sitemaps generate using this
It is a good idea to resubmit the site map to tell Google that I have updated my site again. If you need help creating sitemap Try Sitemap
To take care of all exceptions like url encoding, long urls, large number of urls etc. use Sitemap Generator tool and improve your search engine visibility
May be it is worth a try creating google sitemap with Tejji’s Sitemap
