<http://schema.org/description>
"Google Gets Into Behavioral Targeting, Launches \u201CInterest-Based Advertising\u201D Beta at Search Engine Land is a must read on this story.  In short, Google is testing behavioral ads on the content net"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/archives/019604.html>