<http://schema.org/description>
"A WebmasterWorld thread is reporting that Bing is advertising their search engine on Intellitxt.  Intellitxt are those ads you see inline articles, where you mouse over a word and an annoying ad pops "^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/archives/021696.html>