<http://schema.org/description>
"Google is constantly combatting search engine spammers (I know some to do not like to be called this, so sorry).  This past update, they began blocking an other type of spam named onmouseover JavaScri"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/archives/000596.html>