Creating sitemap for Yahoo is very easy and it supports only .txt file under urllist.txt. You can directly submit it here: Submit to yahoo

You can also authenticate your personal blog here. You must have yahoo id to submit your site map and authenticate your ownership later.
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Site map is the page contains all the URL of a website that helps robots to crawl all the pages. Google or other search engines cannot visit all the pages if the website contains many pages. So to inform crawler about all the pages, xml sitemap is useful.

This file inform crawler when the pages was last modified,
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