<http://schema.org/keywords>
"Darnell Dockett Darnell Dockett San Francisco 49ers darnell dockett 49ers chris borland patrick willis anthony davis justin smith 49ers football San Francisco 49ers football"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.si.com/nfl/2015/06/08/49ers-darnell-dockett-san-francisco-offseason-retirements>