I have seen conflicting information on how to best implement Open Graph namespaces. Specifically, the Open Graph website uses a few different methods, and the Facebook Open Graph examples use other methods.
Open Graph website example (using HTML prefix attribute):
<html prefix="og: http://ogp.me/ns#">
Open Graph website source code (using HTML XMLNS attribute):
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:og="http://ogp.me/ns#">
Facebook Open Graph documentation (using HEAD prefix attribute):
<head prefix="og: http://ogp.me/ns# fb: http://ogp.me/ns/fb#">
Facebook Open Graph documentation #2 (using HTML XMLNS attribute):
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:og="http://ogp.me/ns#"
xmlns:fb="https://www.facebook.com/2008/fbml">
What is the recommended method or does it not even matter?
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