xmlns? What do these html tags mean?

  • Thread starter Thread starter joe j
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joe j

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I downloaded an open source template for my website. At the top are these tags. What do they mean? Do I have to keep them? Here they are:

<html xmlns="http://www.w3.org/1999/xhtml" dir="ltr">
<head profile="http://www.webdevout.net/profile/1.5/">

any help is appreciated thanks.
 
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