<http://schema.org/keywords>
" justin,bieber,cupcake,cake-birthday,cakes,purple,piano,music,Birthday Cakes "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.cakecentral.com/gallery/i/2847998/justin-bieber-cake-inspired-by-many-great-bieber-cakes-online>