Here is Some Sample of my current site map that i am using on my site -
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
xmlns:news="http://www.google.com/schemas/sitemap-news/0.9">
<url>
<loc>http://www.dailylatestresults.com/2009/11/14/maharashtra-state-board-msbshse-mahresult-hsc-10th-ssc12th-results-2009-0766</loc>
<news:news>
<news:publication_date>2009-11-14T08:01:49Z</news:publication_date>
<news:keywords>Maharashtra, hsc results oct 2009, hsc october 2009, hsc results october 2009, hsc results 2009 maharashtra, hsc results, h.s.c result, hsc results 2009, msbshse, maharashtra board, mahresult, hsc board</news:keywords>
</news:news>
</url>
<url>
<loc>http://www.dailylatestresults.com/2009/11/13/results-fae-2009-ireland-0762</loc>
<news:news>
<news:publication_date>2009-11-13T13:41:02Z</news:publication_date>
<news:keywords>World, Results, fae results</news:keywords>
</news:news>
</url>
</urlset>
<!-- Last build time: November 14, 2009, 3:01 am-->
I also checked google for new sitemap tags here - http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=74288
May be it will help you.
This is Correct Format provided by google
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
xmlns:n="http://www.google.com/schemas/sitemap-news/0.9">
<url>
<loc>http://www.example.org/business/article55.html</loc>
<n:news>
<n:publication>
<n:name>The Example Times</n:name>
<n:language>en</n:language>
</n:publication>
<n:access>subscription</n:access>
<n:genres>pressrelease, blog</n:genres>
<n:publication_date>2008-12-23</n:publication_date>
<n:title>Companies A, B in Merger Talks</n:title>
<n:keywords>business, merger, acquisition, A, B</n:keywords>
<n:stock_tickers>NASDAQ:A, NASDAQ:B</n:stock_tickers>
</n:news>
</url>
</urlset>