w3c validator shows error for facebook open graph

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I get 2 errors while validating my site in w3c validator.

Line 7, Column 47: Attribute xmlns:og not allowed here. xmlns:fb=\"http://www.facebook.com/2008/fbml\"

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2021-01-15 08:35

The xmlns attribute is deprecated in HTML+RDFa 1.1.

You should use the prefix attribute instead:

<html 
  prefix="og: http://ogp.me/ns# 
          fb: http://www.facebook.com/2008/fbml">

resp. if you want to keep the xmlns for XHTML5:

<html 
  xmlns="http://www.w3.org/1999/xhtml"
  prefix="og: http://ogp.me/ns# 
          fb: http://www.facebook.com/2008/fbml">

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