<http://schema.org/description>
"Google launched the data highlighter tool in December to make it easier for website owners to add rich snippet data to their web pages.  Google last added six new data types a few months ago to the to"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/google-data-highlighter-book-reviews-17325.html>