<http://schema.org/description>
"In November 2009, Google began allowing you to set your browser to a permanent (cookie specific) SafeSearch lock for your images search results.  So if you never want adult related images to show up i"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/google-safesearch-lock-broke-13006.html>