<http://schema.org/description>
"I spotted a thread at Google Webmaster Help where a site owner was upset his page was not ranking well.Googler, John Mueller took a look and noticed an unusually high amount of title attributes used o"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/google-title-attribute-spam-15152.html>