<http://schema.org/keywords>
"sesame-street,big-bird,cookie-monster,elmo,1st,birthday,birthday-boy,birthday-cakes,birthday-children,blue,green,red,yellow,german-..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.cakecentral.com/gallery/i/2954313/sesame-street-birthday-cake>