What should be submitted as a feed URL in Yahoo siteexplorer if I have sitemap-index.xml, sitemap.xml, sitemap-1.xml, .....sitmeap-20.xml. In Google webmaster tools submitting all (sitemap-index.xml, sitemap.xml, sitemap-1.xml, .....sitmeap-20.xml) works fine. Does same work in Yahoo. or only sitemap-index.xml submission is sufficient or all xml stiemaps should be submitted as feed. Actually i have very large website so have 20 sitemaps where each sitemap covers one complete section of around 500 URLs. Now main confusion is submitting only sitemap-index.xml is enough or need to submit all 20 sitemaps. Please suggest for Bing webmaster tools as well.. Thanks