<http://schema.org/about>
"Ah, the product service system (or PSS): one of TreeHugger's favorite concepts shrouded by one of the clunkiest names. For anyone who'd like a quick refresher, a PSS replaces a product with a service;"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/clean-technology/what-makes-a-good-product-service-system.html>