<http://schema.org/keywords>
" 4th-of-july,4th,american,flag,blue,july,red-white-blue,rosette,red-white,white-blue,red,white "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.cakecentral.com/gallery/i/2361147/4th-of-july-cake>