<http://schema.org/description>
"On Tuesday, I posted the latest version of the Google Search Quality Rating Guidelines after an anonymous reader sent it to us.This version is labelled version 3.18 and dated March 30, 2011.  Since be"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/google-quality-rating-handbook-14184.html>