<http://schema.org/description>
"The Google Farmer/Panda update hit and 40% said they were impacted by the update.We documented advice on how to fix the issue, if you were one of the sites impacted by this update.  But specifically, "^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/farmer-headers-13111.html>