<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/AggregateOffer>
<http://www.pricegrabber.com/computers/desktop++apple-imac-mc309ll-a-all-in-one-computer-intel-core-i5-2-50-ghz-deskto/m-875359178/?ut=36a305eff10ede63>