<http://schema.org/description>
"Google seems to be testing a new AdWords Extension, one that has not really been seen or talked about before, from what I can tell.These are search ad extensions, basically search boxes in the ad, tha"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/google-adwords-site-search-extension-17600.html>