<http://schema.org/about>
"The CPSC issues a recall of 440,000 Nest Protect units. Still, users can continue using it with the potentially dangerous feature in question disabled."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/family/protection-safety/blogs/the-worlds-smartest-smoke-detector-is-recalled>