<http://schema.org/keywords>
"golf how to"^^<http://www.w3.org/2001/XMLSchema#string>
<http://video.golfdigest.com/watch/swing-sequence-jack-nicklaus-face-on?/golf-instruction/swing-sequences/2007-07/nicklaus_faceon&/golf-instruction/swing-sequences/2007-07/nicklaus_faceon>