<http://schema.org/topics>
"auction,auctions,austin,Boston,buying,Chicago,Dallas-Fort Worth,ebay,economy,Lists,Los Angeles,Miami,Money and Finance Lists,new york,e-commerce,Philadelphia,San Diego,San Francisco-San Jose,selling,shopping,Shopping Lists,Politics,web,web 2.0"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2008/10/14/ebay-alternatives/>