<http://schema.org/description>
"I am shocked to see Google testing ads on the knowledge graph so soon!  @gfiorelli1 posted a picture on Twitter of the new car knowledge graph that launched a week or so ago with an ad format on it!He"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/google-knowledge-graph-ads-17813.html>