<http://schema.org/description>
"In October, we reported that Google treats a 410 stronger than a 404 status code.  I am not sure exactly when Google made the 410 status code that important, but I believe it was sometime in October.A"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/archives/021586.html>