<http://schema.org/about>
"I have a few issues with gift cards. First, they're little plastic cards that people rarely ever refill and therefore are basically single-use items. The recycling rate on these is probably very low (though the"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/corporate-responsibility/redeem-gift-cards-on-your-cell-phone-and-ditch-the-plastic.html>