<http://schema.org/keywords>
"nfl nfl rule changes nfl instant replay change nfl replay changes nfl replay officials nfl league offices replay rules nfl owners meeting nfl owners vote"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.si.com/nfl/2016/05/24/nfl-instant-replay-rules-changes-league-offices-play-review>