<http://schema.org/description>
"Bill Slawski started a thread over at Cre8asite Forums named Yahoo! Superunits: of signatures and co-occurence.  In that thread, he discusses a new patent Yahoo! Search released (on April 14th) named "^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/archives/001840.html>