<http://schema.org/description>
"Micropayments are a popular way for developers of online games to make money from their products. Players typically get the game for free but must pay for extra levels, upgraded items ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/2009/06/25/heyzap-bring-micropayments-flash-gaming/?fromcat=all>