<http://schema.org/keywords>
"justin houston injury chiefs acl surgery update justin houston justin houston injury justin houston chiefs justin houston acl justin houston knee justin houston knee injury justin houston injury update justin houston knee surgery justin houston surgery justin houston out for season justin houston 2016"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.si.com/nfl/2016/03/22/justin-houston-injury-chiefs-acl-surgery-update>