<http://schema.org/keywords>
"2016 summer olympics 2016 Summer Olympics Rio 2016 Summer Olympics polluted waters 2016 rio de janeiro games 2016 rio olympics soccer 2016 olympics Summer Olympics 2016 Internatlional Olympic Committee"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.si.com/more-sports/2015/07/30/rio-de-janeiro-2016-summer-olympic-polluted-waters>