<http://schema.org/keywords>
"bill vinovich bill vinovich head referee super bowl bill vinovich super bowl xlix bill vinovich patriots seahawks bill vinovich patriots ravens bill vinovich referee bill vinovich super bowl referee bill vinovich super bowl officials"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.si.com/nfl/2015/01/20/bill-vinovich-head-referee-game-officials-crew-super-bowl-xlix>