Sitemap.xml

I get to see following codes used at the beginning of  sitemap.xml for different sites ? What's the differences between these three set of codes ? Can you clarify this ?

<?xml version="1.0" encoding="UTF-8" ?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
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<?xml version="1.0" encoding="utf-8" ?>
<urlset xmlns="http://www.google.com/schemas/sitemap/0.84">
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<?xml version="1.0" encoding="UTF-8" ?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">
niwellAsked:
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Michel PlungjanIT ExpertCommented:
Different versions of the same file to validate the sitemap against

http://www.sitemaps.org/

http://www.google.com/support/webmasters/bin/topic.py?topic=8476

xmlns is the namespace and the other urls are to point to where the schema is found

http://www.w3schools.com/XML/xml_namespaces.asp
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